#include <Mercator.h>

Inheritance diagram for Isis::Mercator:

Collaboration diagram for Isis::Mercator:

Public Types
enum	LatitudeType { Planetocentric, Planetographic }
	This enum defines the types of Latitude supported in this class. More...

enum	LongitudeDirection { PositiveEast, PositiveWest }
	This enum defines the types of Longitude directions supported in this class. More...

enum	ProjectionType { Triaxial, RingPlane }
	This enum defines the subclasses of Projection supported in Isis. More...

Public Member Functions
	Mercator (Pvl &label, bool allowDefaults=false)
	Constructs a Mercator object. More...

	~Mercator ()
	Destroys the Mercator object. More...

bool	operator== (const Projection &proj)
	Compares two Projection objects to see if they are equal. More...

QString	Name () const
	Returns the name of the map projection, "Mercator". More...

QString	Version () const
	Returns the version of the map projection. More...

double	TrueScaleLatitude () const
	Returns the latitude of true scale in degrees. More...

bool	IsEquatorialCylindrical ()
	Indicates whether the projection is Equitorial Cylindrical. More...

bool	SetGround (const double lat, const double lon)
	This method is used to set the latitude/longitude (assumed to be of the correct LatitudeType, LongitudeDirection, and LongitudeDomain. More...

bool	SetCoordinate (const double x, const double y)
	This method is used to set the projection x/y. More...

bool	XYRange (double &minX, double &maxX, double &minY, double &maxY)
	This method is used to determine the x/y range which completely covers the area of interest specified by the lat/lon range. More...

PvlGroup	Mapping ()
	This function returns the keywords that this projection uses. More...

PvlGroup	MappingLatitudes ()
	This function returns the latitude keywords that this projection uses. More...

PvlGroup	MappingLongitudes ()
	This function returns the longitude keywords that this projection uses. More...

double	EquatorialRadius () const
	This returns the equatorial radius of the target. More...

double	PolarRadius () const
	This returns the polar radius of the target. More...

double	Eccentricity () const
	This returns the eccentricity of the target,. More...

double	LocalRadius (double lat) const
	This method returns the local radius in meters at the specified latitude position. More...

double	LocalRadius () const
	This method returns the local radius in meters at the current latitude position. More...

bool	IsPlanetocentric () const
	This indicates if the latitude type is planetocentric (as opposed to planetographic). More...

bool	IsPlanetographic () const
	This indicates if the latitude type is planetographic (as opposed to planetocentric). More...

QString	LatitudeTypeString () const
	This method returns the latitude type as a string. More...

double	ToPlanetocentric (const double lat) const
	This method converts a planetographic latitude to a planetocentric latitude. More...

double	ToPlanetographic (const double lat) const
	This method converts a planetocentric latitude to a planetographic latitude. More...

bool	IsPositiveEast () const
	This indicates if the longitude direction type is positive west (as opposed to postive east). More...

bool	IsPositiveWest () const
	This indicates if the longitude direction type is positive east (as opposed to postive west). More...

QString	LongitudeDirectionString () const
	This method returns the longitude direction as a string. More...

bool	Has180Domain () const
	This indicates if the longitude domain is -180 to 180 (as opposed to 0 to 360). More...

bool	Has360Domain () const
	This indicates if the longitude domain is 0 to 360 (as opposed to -180 to 180). More...

QString	LongitudeDomainString () const
	This method returns the longitude domain as a string. More...

double	MinimumLatitude () const
	This returns the minimum latitude of the area of interest. More...

double	MaximumLatitude () const
	This returns the maximum latitude of the area of interest. More...

double	MinimumLongitude () const
	This returns the minimum longitude of the area of interest. More...

double	MaximumLongitude () const
	This returns the maximum longitude of the area of interest. More...

double	Latitude () const
	This returns a latitude with correct latitude type as specified in the label object. More...

double	Longitude () const
	This returns a longitude with correct longitude direction and domain as specified in the label object. More...

bool	SetUniversalGround (const double lat, const double lon)
	This method is used to set the latitude/longitude which must be Planetocentric (latitude) and PositiveEast/Domain360 (longitude). More...

bool	SetUnboundUniversalGround (const double coord1, const double coord2)
	This method is used to set the latitude/longitude. More...

double	UniversalLatitude ()
	This returns a universal latitude (planetocentric). More...

double	UniversalLongitude ()
	This returns a universal longitude (positive east in 0 to 360 domain). More...

double	Scale () const
	This method returns the scale for mapping world coordinates into projection coordinates. More...

bool	operator!= (const Projection &proj)
	This method determines whether two map projection objects are not equal. More...

void	setProjectionType (const ProjectionType ptype)
	Sets the projection subclass type. More...

ProjectionType	projectionType () const
	Returns an enum value for the projection type. More...

bool	IsSky () const
	Returns true if projection is sky and false if it is land. More...

bool	HasGroundRange () const
	This indicates if the longitude direction type is positive west (as opposed to postive east). More...

double	Rotation () const
	Returns the value of the Rotation keyword from the mapping group. More...

void	SetWorldMapper (WorldMapper *mapper)
	If desired the programmer can use this method to set a world mapper to be used in the SetWorld, WorldX, and WorldY methods. More...

bool	IsGood () const
	This indicates if the last invocation of SetGround, SetCoordinate, SetUniversalGround, or SetWorld was with successful or not. More...

double	XCoord () const
	This returns the projection X provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success. More...

double	YCoord () const
	This returns the projection Y provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success. More...

bool	SetWorld (const double x, const double y)
	This method is used to set a world coordinate. More...

double	WorldX () const
	This returns the world X coordinate provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success. More...

double	WorldY () const
	This returns the world Y coordinate provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success. More...

double	ToWorldX (const double projectionX) const
	This method converts a projection x value to a world x value. More...

double	ToWorldY (const double projectionY) const
	This method converts a projection y value to a world y value. More...

double	ToProjectionX (const double worldX) const
	This method converts a world x value to a projection x value. More...

double	ToProjectionY (const double worldY) const
	This method converts a world y value to a projection y value. More...

double	Resolution () const
	This method returns the resolution for mapping world coordinates into projection coordinates. More...

void	SetUpperLeftCorner (const Displacement &x, const Displacement &y)
	This method is used to find the XY range for oblique aspect projections (non-polar projections) by "walking" around each of the min/max lat/lon. More...

Static Public Member Functions
static double	ToPlanetocentric (double lat, double eRadius, double pRadius)
	This method converts a planetographic latitude to a planetocentric latitude. More...

static double	ToPlanetographic (double lat, double eRadius, double pRadius)
	This method converts a planetocentric latitude to a planetographic latitude. More...

static double	ToPositiveEast (const double lon, const int domain)
	This method converts a longitude into the positive east direction. More...

static double	ToPositiveWest (const double lon, const int domain)
	This method converts a longitude into the positive west direction. More...

static double	To180Domain (const double lon)
	This method converts a longitude into the -180 to 180 domain. More...

static double	To360Domain (const double lon)
	This method converts a longitude into the 0 to 360 domain. More...

static double	ToHours (double angle)
	Converts the given angle (in degrees) to hours by using the ratio 15 degrees per hour. More...

static QString	ToDMS (double angle)
	Converts the given angle (in degrees) to degrees, minutes, seconds. More...

static QString	ToHMS (double angle)
	Converts the given angle (in degrees) to hours, minutes, seconds. More...

Protected Member Functions
void	XYRangeCheck (const double latitude, const double longitude)
	This convience function is established to assist in the development of the XYRange virtual method. More...

bool	inLongitudeRange (double longitude)
	Determine whether the given longitude is within the range of the MinimumLongitude and MaximumLongitude range of this projection. More...

bool	inLongitudeRange (double minLon, double maxLon, double longitude)
	Determine whether the given longitude is within the range of the given min and max longitudes. More...

bool	inLatitudeRange (double latitude)
	Determine whether the given latitude is within the range of the MinimumLatitude and MaximumLatitude range of this projection. More...

bool	xyRangeOblique (double &minX, double &maxX, double &minY, double &maxY)
	This method is used to find the XY range for oblique aspect projections (non-polar projections) by "walking" around each of the min/max lat/lon. More...

double	qCompute (const double sinPhi) const
	A convience method to compute Snyder's q equation (3-12) for a given latitude, \(\phi\). More...

double	phi2Compute (const double t) const
	A convience method to compute latitude angle phi2 given small t, from Syder's recursive equation (7-9) More...

double	mCompute (const double sinphi, const double cosphi) const
	A convience method to compute Snyder's m equation (14-15) for a given latitude, \(\phi\). More...

double	tCompute (const double phi, const double sinphi) const
	A convience method to compute Snyder's t equation (15-9) for a given latitude, \(\phi\). More...

double	e4Compute () const
	A convience method to compute. More...

void	SetXY (double x, double y)
	This protected method is a helper for derived classes. More...

void	SetComputedXY (double x, double y)
	This protected method is a helper for derived classes. More...

double	GetX () const
	Calculates the unrotated form of current x value. More...

double	GetY () const
	Calculates the unrotated form of the current y value. More...

double	PixelResolution () const
	Returns the pixel resolution value from the PVL mapping group in meters/pixel. More...

Protected Attributes
double	m_latitude
	This contains the currently set latitude value. More...

double	m_longitude
	This contains the currently set longitude value. More...

LatitudeType	m_latitudeType
	An enumerated type indicating the LatitudeType read from the labels. More...

LongitudeDirection	m_longitudeDirection
	An enumerated type indicating the LongitudeDirection read from the labels. More...

int	m_longitudeDomain
	This integer is either 180 or 360 and is read from the labels. More...

double	m_equatorialRadius
	Polar radius of the target. More...

double	m_polarRadius
	Polar radius of the target. More...

double	m_eccentricity
	The eccentricity of the target body. More...

double	m_minimumLatitude
	Contains the minimum latitude for the entire ground range. More...

double	m_maximumLatitude
	Contains the maximum latitude for the entire ground range. More...

double	m_minimumLongitude
	Contains the minimum longitude for the entire ground range. More...

double	m_maximumLongitude
	Contains the maximum longitude for the entire ground range. More...

WorldMapper *	m_mapper
	This points to a mapper passed into the SetWorldMapper method. More...

bool	m_good
	Indicates if the contents of m_x, m_y, m_latitude, and m_longitude are valid. More...

bool	m_sky
	Indicates whether projection is sky or land. More...

bool	m_groundRangeGood
	Indicates if the ground range (min/max lat/lons) were read from the labels. More...

double	m_minimumX
	The data elements m_minimumX, m_minimumY, m_maximumX, and m_maximumY are convience data elements when you write the XYRange virtual function. More...

double	m_maximumX
	See minimumX description. More...

double	m_minimumY
	See minimumX description. More...

double	m_maximumY
	See minimumX description. More...

PvlGroup	m_mappingGrp
	Mapping group that created this projection. More...

Detailed Description

Mercator Map Projection.

This class provides methods for the forward and inverse equations of a Mercator map projection (for an ellipsoid).

The Mercator projection is cylindrical and conformal, preserving angles and shapes of small objects and distorting the shape of large objects. The cylinder wraps the planet along the equator, with the poles at infinity. Latitudes and longitudes are straight lines, crossing at right angles. However, latitudes are unequally spaced and longitudes are equally spaced.

The code was converted to C++ from the C version of the USGS General Cartographic Transformation Package (GCTP). This class inherits Projection and provides the two virtual methods SetGround (forward) and SetCoordinate (inverse) and a third virtual method, XYRange, for obtaining projection coordinate coverage for a latitude/longitude window.

Please see the Projection class for a full accounting of all the methods available.

Author: 2005-02-25 Elizabeth Ribelin

Member Enumeration Documentation

◆ LatitudeType

enum Isis::TProjection::LatitudeType

inherited

This enum defines the types of Latitude supported in this class.

Enumerator
Planetocentric	Latitudes are measured as the angle from the equatorial plane to the plane through the center of the planet and a given point on the surface of the planet.
Planetographic	Latitudes are measured as the angle from the equatorial plane to the normal to the surface of the planet at a given point.

◆ LongitudeDirection

enum Isis::TProjection::LongitudeDirection

inherited

This enum defines the types of Longitude directions supported in this class.

Enumerator
PositiveEast	Longitude values increase in the easterly direction.
PositiveWest	Longitude values increase in the westerly direction.

◆ ProjectionType

enum Isis::Projection::ProjectionType

inherited

This enum defines the subclasses of Projection supported in Isis.

Enumerator
Triaxial	These projections are used to map triaxial and irregular-shaped bodies.
RingPlane	These projections are used to map ring planes.

Constructor & Destructor Documentation

◆ Mercator()

Isis::Mercator::Mercator	(	Pvl &	label,
		bool	allowDefaults = `false`
	)

Constructs a Mercator object.

Parameters

label	This argument must be a Label containing the proper mapping information as indicated in the Projection class. Additionally, the mercator projection requires the center longitude to be defined in the keyword CenterLongitude.
allowDefaults	If set to false the constructor expects that a keyword of CenterLongitude will be in the label. Otherwise it will attempt to compute the center longitude using the middle of the longitude range specified in the labels. Defaults to false.

Exceptions

IException

◆ ~Mercator()

Isis::Mercator::~Mercator ( )

Destroys the Mercator object.

Member Function Documentation

◆ e4Compute()

double Isis::TProjection::e4Compute ( ) const

protectedinherited

A convience method to compute.

\[ e4 = \sqrt{(1+e )^{1+e}(1-e)^{1-e}} \]

where e is the eccentricity of the body.

Returns: double The value for the e4 formula.

References Isis::TProjection::Eccentricity().

Referenced by Isis::PolarStereographic::PolarStereographic().

◆ Eccentricity()

double Isis::TProjection::Eccentricity ( ) const

inherited

This returns the eccentricity of the target,.

\[ e = \sqrt{1 - \frac{PR^2}{ER^2}} \]

where PR is the polar radius and ER is the equatorial radius. Since polar and equatorial radii are required to be greater than zero, it follows that \( 0 \le e < 1 \) . Note that if the body is spherical, then PR = ER and so e = 0.

Returns: double

References Isis::TProjection::m_eccentricity.

Referenced by Isis::TProjection::e4Compute(), Isis::TProjection::mCompute(), Mercator(), Isis::TProjection::phi2Compute(), Isis::TProjection::tCompute(), and Isis::TransverseMercator::TransverseMercator().

◆ EquatorialRadius()

double Isis::TProjection::EquatorialRadius ( ) const

inherited

This returns the equatorial radius of the target.

The radius was obtained from the label during object construction.

Returns: double

References Isis::TProjection::m_equatorialRadius.

Referenced by Isis::MosaicGridTool::fromPvl(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::TProjection::operator==(), and Isis::MosaicGridTool::setLatExtents().

◆ GetX()

double Isis::Projection::GetX ( ) const

protectedinherited

Calculates the unrotated form of current x value.

Returns: double The unrotated x-value.

References Isis::PI.

Referenced by Isis::RingCylindrical::SetCoordinate(), Isis::Mollweide::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), SetCoordinate(), Isis::LambertConformal::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::ObliqueCylindrical::SetCoordinate(), Isis::SimpleCylindrical::SetCoordinate(), Isis::Equirectangular::SetCoordinate(), Isis::Sinusoidal::SetCoordinate(), and Isis::Orthographic::SetCoordinate().

◆ GetY()

double Isis::Projection::GetY ( ) const

protectedinherited

Calculates the unrotated form of the current y value.

Returns: double The unrotated y-value.

References Isis::PI.

Referenced by Isis::RingCylindrical::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), SetCoordinate(), Isis::LambertConformal::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::ObliqueCylindrical::SetCoordinate(), Isis::SimpleCylindrical::SetCoordinate(), Isis::Equirectangular::SetCoordinate(), Isis::Sinusoidal::SetCoordinate(), and Isis::Orthographic::SetCoordinate().

◆ Has180Domain()

bool Isis::TProjection::Has180Domain ( ) const

inherited

This indicates if the longitude domain is -180 to 180 (as opposed to 0 to 360).

The longitude domain was obtained from the label during object construction.

Returns: bool

References Isis::TProjection::m_longitudeDomain.

Referenced by Isis::MosaicSceneItem::reproject(), and Isis::SubArea::UpdateLabel().

◆ Has360Domain()

bool Isis::TProjection::Has360Domain ( ) const

inherited

This indicates if the longitude domain is 0 to 360 (as opposed to -180 to 180).

The longitude domain was obtained from the label during object construction.

Returns: bool

References Isis::TProjection::m_longitudeDomain.

Referenced by Isis::MosaicGridTool::domainMaxLon(), and Isis::MosaicGridTool::domainMinLon().

◆ HasGroundRange()

bool Isis::Projection::HasGroundRange ( ) const

inherited

This indicates if the longitude direction type is positive west (as opposed to postive east).

The longitude type was obtained from the label during object construction.

Returns: bool This indicates if the longitude direction type is positive east (as opposed to postive west). The longitude type was obtained from the label during object construction.; bool This method returns the longitude direction as a string. It will return either PositiveEast or PositiveWest.; string The longitude direction, "PositiveEast" or "PositiveWest". This indicates if the longitude domain is -180 to 180 (as opposed to 0 to 360). The longitude domain was obtained from the label during object construction.; bool This indicates if the longitude domain is 0 to 360 (as opposed to -180 to 180). The longitude domain was obtained from the label during object construction.; bool This method converts a longitude into the -180 to 180 domain. It will leave the longitude unchanged if it is already in the domain.

Parameters

lon	Longitude to convert into the -180 to 180 domain.

Exceptions

IException::Unknown - "The given longitude is invalid."

Returns: double The longitude, converted to 180 domain. This method converts a longitude into the 0 to 360 domain. It will leave the longitude unchanged if it is already in the domain.

Parameters

lon	Longitude to convert into the 0 to 360 domain.

Returns: double The longitude, converted to 360 domain. This method returns the longitude domain as a string. It will return either 180 or 360.; string The longitude domain, "180" or "360". This indicates that the labels contained minimum and maximum ground coordinatess (e.g., a ground range coverage). If the projection has ground range coverage then the MinimumLatitude, MaximumLatitude, MinimumLongitude, and MaximumLongitude methods or comparable methods for other projection types can be used. The ground range coverage essentially defines the area of user interest.; bool

References Isis::Projection::m_groundRangeGood.

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::RingPlaneProjection::Mapping(), Isis::TProjection::MappingLatitudes(), Isis::TProjection::MappingLongitudes(), Isis::RingCylindrical::MappingRingLongitudes(), Isis::Planar::MappingRingLongitudes(), Isis::RingPlaneProjection::MappingRingLongitudes(), Isis::RingCylindrical::MappingRingRadii(), Isis::Planar::MappingRingRadii(), Isis::RingPlaneProjection::MappingRingRadii(), Isis::ProjectionFactory::RingsCreateForCube(), and Isis::TProjection::xyRangeOblique().

◆ inLatitudeRange()

bool Isis::TProjection::inLatitudeRange ( double latitude )

protectedinherited

Determine whether the given latitude is within the range of the MinimumLatitude and MaximumLatitude range of this projection.

Note: It is a good habit to call this function to verify that a value is in range before passing it to XYRangeCheck.

See also: inLongitudeRange(minLon, maxLon, longitude); inLongitudeRange(longitude); XYRangeCheck(latitude, longitude)

Parameters

latitude The latitude to check.

Returns: bool Indicates whether MinimumLatitude <= latitude <= MaximumLatitude.

References Isis::TProjection::MaximumLatitude(), and Isis::TProjection::MinimumLatitude().

◆ inLongitudeRange() [1/2]

bool Isis::TProjection::inLongitudeRange ( double longitude )

protectedinherited

Determine whether the given longitude is within the range of the MinimumLongitude and MaximumLongitude range of this projection.

Note: It is a good habit to call this function to verify that a value is in range before passing it to XYRangeCheck.

See also: inLongitudeRange(minLon, maxLon, longitude); inLatitudeRange(latitude); XYRangeCheck(latitude, longitude)

Parameters

longitude The longitude to check.

Returns: bool Indicates whether MinimumLongitude <= longitude <= MaximumLongitude.

References Isis::TProjection::MaximumLongitude(), and Isis::TProjection::MinimumLongitude().

◆ inLongitudeRange() [2/2]

bool Isis::TProjection::inLongitudeRange	(	double	minLon,
		double	maxLon,
		double	longitude
	)

protectedinherited

Determine whether the given longitude is within the range of the given min and max longitudes.

Note: It is a good habit to call this function to verify that a value is in range before passing it to XYRangeCheck.

See also: inLongitudeRange(longitude); inLatitudeRange(latitude); XYRangeCheck(latitude, longitude)

Parameters

minLon	The lower end of longitude range.
maxLon	The upper end of longitude range.
longitude	The longitude to check.

Returns: bool Indicates whether minLon <= longitude <= maxLon.

References Isis::TProjection::To360Domain().

◆ IsEquatorialCylindrical()

bool Isis::Mercator::IsEquatorialCylindrical ( )

virtual

Indicates whether the projection is Equitorial Cylindrical.

Returns: bool True if the projection is cylindrical.

Reimplemented from Isis::TProjection.

◆ IsGood()

bool Isis::Projection::IsGood ( ) const

inherited

This indicates if the last invocation of SetGround, SetCoordinate, SetUniversalGround, or SetWorld was with successful or not.

If there was success then the Latitude, Longitude, XCoord, YCoord, UniversalLatitude, UniversalLongitude, WorldX, and WorldY methods can be utilized.

Returns: bool True if the last call to SetGround, SetCoordinate, SetUniversalGround, or SetWorld was successful.

References Isis::Projection::m_good.

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::Chip::Load(), Isis::ProjectionFactory::RingsCreateForCube(), Isis::SubArea::UpdateLabel(), Isis::RingPlaneProjection::XYRangeCheck(), and Isis::TProjection::XYRangeCheck().

◆ IsPlanetocentric()

bool Isis::TProjection::IsPlanetocentric ( ) const

inherited

This indicates if the latitude type is planetocentric (as opposed to planetographic).

The latitude type was obtained from the label during object construction.

Returns: bool

References Isis::TProjection::m_latitudeType, and Isis::TProjection::Planetocentric.

Referenced by Isis::LambertConformal::LambertConformal(), Mercator(), Isis::ObliqueCylindrical::ObliqueCylindrical(), Isis::TProjection::operator==(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::LunarAzimuthalEqualArea::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), SetCoordinate(), Isis::LambertConformal::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::LunarAzimuthalEqualArea::SetGround(), Isis::PointPerspective::SetGround(), Isis::TransverseMercator::SetGround(), SetGround(), Isis::LambertConformal::SetGround(), Isis::PolarStereographic::SetGround(), Isis::Orthographic::SetGround(), and Isis::TransverseMercator::TransverseMercator().

◆ IsPlanetographic()

bool Isis::TProjection::IsPlanetographic ( ) const

inherited

This indicates if the latitude type is planetographic (as opposed to planetocentric).

The latitude type was obtained from the label during object construction.

Returns: bool

References Isis::TProjection::m_latitudeType, and Isis::TProjection::Planetographic.

Referenced by Isis::SubArea::UpdateLabel().

◆ IsPositiveEast()

bool Isis::TProjection::IsPositiveEast ( ) const

inherited

This indicates if the longitude direction type is positive west (as opposed to postive east).

The longitude type was obtained from the label during object construction.

Returns: bool

References Isis::TProjection::m_longitudeDirection, and Isis::TProjection::PositiveEast.

Referenced by Isis::SubArea::UpdateLabel().

◆ IsPositiveWest()

bool Isis::TProjection::IsPositiveWest ( ) const

inherited

This indicates if the longitude direction type is positive east (as opposed to postive west).

The longitude type was obtained from the label during object construction.

Returns: bool

References Isis::TProjection::m_longitudeDirection, and Isis::TProjection::PositiveWest.

Referenced by Isis::TProjection::operator==().

◆ IsSky()

bool Isis::Projection::IsSky ( ) const

inherited

Returns true if projection is sky and false if it is land.

Returns: bool

References Isis::Projection::m_sky.

Referenced by Isis::Camera::SetImage(), and Isis::Camera::SetRightAscensionDeclination().

◆ Latitude()

double Isis::TProjection::Latitude ( ) const

inherited

This returns a latitude with correct latitude type as specified in the label object.

The method can only be used if SetGround, SetCoordinate, SetUniversalGround, or SetWorld return with success. Success can also be checked using the IsGood method.

Returns: double

References Isis::TProjection::m_latitude.

Referenced by Isis::MosaicAreaTool::mouseButtonRelease(), Isis::MosaicFindTool::mouseButtonRelease(), Isis::MosaicControlNetTool::mouseButtonRelease(), Isis::MosaicGridTool::setLatExtents(), Isis::MosaicTrackTool::updateLabels(), and Isis::PolygonTools::XYToLatLon().

◆ LatitudeTypeString()

QString Isis::TProjection::LatitudeTypeString ( ) const

inherited

This method returns the latitude type as a string.

It will return either Planetocentric or Planetographic.

Returns: string The latitude type, "Planetocentric" or "Planetographic".

References Isis::TProjection::m_latitudeType, and Isis::TProjection::Planetographic.

Referenced by Isis::MosaicGridTool::latType().

◆ LocalRadius() [1/2]

double Isis::TProjection::LocalRadius ( double latitude ) const

inherited

This method returns the local radius in meters at the specified latitude position.

For this method, the local radius is defined as the distance from the center of the planet to the surface of the planet at the given latitude.

\[ LR = \frac{ER*PR}{\sqrt{PR^2 \cos^2(LAT)+ER^2 \sin^2(LAT)}} \]

Parameters

latitude A latitude in degrees (assumed to be of the correct LatitudeType).

Exceptions

IException::Unknown - "The given latitude is invalid."

Returns: double The value for the local radius, in meters, at the given latitude.

References _FILEINFO_, Isis::TProjection::m_equatorialRadius, Isis::TProjection::m_polarRadius, Isis::Null, Isis::PI, Isis::toString(), and Isis::IException::Unknown.

Referenced by Isis::TiffImporter::convertProjection(), and Isis::ProjectionFactory::CreateForCube().

◆ LocalRadius() [2/2]

double Isis::TProjection::LocalRadius ( ) const

virtualinherited

This method returns the local radius in meters at the current latitude position.

This is only usable if the use of SetGround or SetCoordinate was successful.

Returns: double The value for the local radius, in meters, at the current latitude.

Implements Isis::Projection.

References Isis::TProjection::m_latitude.

Referenced by Isis::Equirectangular::Equirectangular().

◆ Longitude()

double Isis::TProjection::Longitude ( ) const

inherited

This returns a longitude with correct longitude direction and domain as specified in the label object.

The method can only be used if SetGround, SetCoordinate, SetUniversalGround, or SetWorld return with success. Success can also be checked using the IsGood method.

Returns: double

References Isis::TProjection::m_longitude.

Referenced by Isis::MosaicAreaTool::mouseButtonRelease(), Isis::MosaicFindTool::mouseButtonRelease(), Isis::MosaicControlNetTool::mouseButtonRelease(), Isis::MosaicGridTool::setLonExtents(), Isis::MosaicTrackTool::updateLabels(), and Isis::PolygonTools::XYToLatLon().

◆ LongitudeDirectionString()

QString Isis::TProjection::LongitudeDirectionString ( ) const

inherited

This method returns the longitude direction as a string.

It will return either PositiveEast or PositiveWest.

Returns: string The longitude direction, "PositiveEast" or "PositiveWest".

References Isis::TProjection::m_longitudeDirection, and Isis::TProjection::PositiveEast.

◆ LongitudeDomainString()

QString Isis::TProjection::LongitudeDomainString ( ) const

inherited

This method returns the longitude domain as a string.

It will return either 180 or 360.

Returns: string The longitude domain, "180" or "360".

References Isis::TProjection::m_longitudeDomain.

Referenced by Isis::MosaicGridTool::lonDomain().

◆ Mapping()

PvlGroup Isis::Mercator::Mapping ( )

virtual

This function returns the keywords that this projection uses.

Returns: PvlGroup The keywords that this projection uses

Reimplemented from Isis::TProjection.

References Isis::Projection::m_mappingGrp, and Isis::TProjection::Mapping().

◆ MappingLatitudes()

PvlGroup Isis::Mercator::MappingLatitudes ( )

virtual

This function returns the latitude keywords that this projection uses.

Returns: PvlGroup The latitude keywords that this projection uses

Reimplemented from Isis::TProjection.

References Isis::Projection::m_mappingGrp, and Isis::TProjection::MappingLatitudes().

◆ MappingLongitudes()

PvlGroup Isis::Mercator::MappingLongitudes ( )

virtual

This function returns the longitude keywords that this projection uses.

Returns: PvlGroup The longitude keywords that this projection uses

Reimplemented from Isis::TProjection.

References Isis::Projection::m_mappingGrp, and Isis::TProjection::MappingLongitudes().

◆ MaximumLatitude()

double Isis::TProjection::MaximumLatitude ( ) const

inherited

This returns the maximum latitude of the area of interest.

The value was obtained from the labels during object construction. This method can only be used if HasGroundRange returns a true.

Returns: double

References Isis::TProjection::m_maximumLatitude.

Referenced by Isis::TProjection::inLatitudeRange(), Isis::MosaicGridTool::setLatExtents(), and Isis::TProjection::xyRangeOblique().

◆ MaximumLongitude()

double Isis::TProjection::MaximumLongitude ( ) const

inherited

This returns the maximum longitude of the area of interest.

The value was obtained from the labels during object construction. This method can only be used if HasGroundRange returns a true.

Returns: double

References Isis::TProjection::m_maximumLongitude.

Referenced by Isis::TProjection::inLongitudeRange(), Isis::MosaicGridTool::setLonExtents(), Isis::Orthographic::XYRange(), and Isis::TProjection::xyRangeOblique().

◆ mCompute()

double Isis::TProjection::mCompute	(	const double	sinphi,
		const double	cosphi
	)		const

protectedinherited

A convience method to compute Snyder's m equation (14-15) for a given latitude, \(\phi\).

\[ m = \frac{\cos(\phi)}{\sqrt{1-e^2 \sin^2(\phi)}} \]

where \(e\) is the eccentricity for the body.

Parameters

sinphi	sine of phi
cosphi	cosine of phi

Returns: double Value for Snyder's m variable.

References Isis::TProjection::Eccentricity().

Referenced by Isis::LambertConformal::LambertConformal(), and Isis::PolarStereographic::PolarStereographic().

◆ MinimumLatitude()

double Isis::TProjection::MinimumLatitude ( ) const

inherited

This returns the minimum latitude of the area of interest.

The value was obtained from the labels during object construction. This method can only be used if HasGroundRange returns a true.

Returns: double

References Isis::TProjection::m_minimumLatitude.

Referenced by Isis::TProjection::inLatitudeRange(), Isis::MosaicGridTool::setLatExtents(), and Isis::TProjection::xyRangeOblique().

◆ MinimumLongitude()

double Isis::TProjection::MinimumLongitude ( ) const

inherited

This returns the minimum longitude of the area of interest.

The value was obtained from the labels during object construction. This method can only be used if HasGroundRange returns a true.

Returns: double

References Isis::TProjection::m_minimumLongitude.

Referenced by Isis::TProjection::inLongitudeRange(), Isis::MosaicGridTool::setLonExtents(), Isis::Orthographic::XYRange(), and Isis::TProjection::xyRangeOblique().

◆ Name()

QString Isis::Mercator::Name ( ) const

virtual

Returns the name of the map projection, "Mercator".

Returns: QString Name of projection, "Mercator"

Implements Isis::TProjection.

◆ operator!=()

bool Isis::Projection::operator!= ( const Projection & proj )

inherited

This method determines whether two map projection objects are not equal.

True is returned if they have at least some differences in the radii, latitude type, longitude direction, resolution, or projection name.

Parameters

proj	A reference to a Projection object to which this Projection will be compared.

Returns: bool Indicates whether the Projection objects are not equivalent.

◆ operator==()

bool Isis::Mercator::operator== ( const Projection & proj )

virtual

Compares two Projection objects to see if they are equal.

Parameters

proj	Projection object to do comparison on

Returns: bool Returns true if the Projection objects are equal, and false if they are not

Reimplemented from Isis::TProjection.

◆ phi2Compute()

double Isis::TProjection::phi2Compute ( const double t ) const

protectedinherited

A convience method to compute latitude angle phi2 given small t, from Syder's recursive equation (7-9)

\[ \phi_{i+1} = \frac{\pi}{2} - 2\arctan\left(t \left[\frac{1-e\sin(\phi_i)}{1+e\sin(\phi_i)}\right]^{e/2}\right) \]

where \(e\) is the eccentricity for the body and \( \phi_0 = \frac{\pi}{2} - 2\arctan(t) \) .

Parameters

t small t

Exceptions

IException::Unknown - "Failed to converge in Projection::phi2Compute()"

Returns: double The value for the latitude.

References _FILEINFO_, Isis::TProjection::Eccentricity(), Isis::HALFPI, and Isis::IException::Unknown.

Referenced by SetCoordinate(), Isis::LambertConformal::SetCoordinate(), and Isis::PolarStereographic::SetCoordinate().

◆ PixelResolution()

double Isis::Projection::PixelResolution ( ) const

protectedinherited

Returns the pixel resolution value from the PVL mapping group in meters/pixel.

Returns: double pixel resolution in meters/pixel

Referenced by Isis::RingCylindrical::XYRange(), and Isis::Planar::XYRange().

◆ PolarRadius()

double Isis::TProjection::PolarRadius ( ) const

inherited

This returns the polar radius of the target.

The radius was obtained from the label during object construction.

Returns: double

References Isis::TProjection::m_polarRadius.

Referenced by Isis::MosaicGridTool::fromPvl(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::TProjection::operator==(), and Isis::MosaicGridTool::setLatExtents().

◆ projectionType()

Projection::ProjectionType Isis::Projection::projectionType ( ) const

inherited

Returns an enum value for the projection type.

Returns: projection subclass type

Referenced by Isis::MosaicGridTool::autoGrid(), Isis::MosaicGridTool::fromPvl(), Isis::MosaicFindTool::getUserGroundPoint(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::UniversalGroundMap::GroundRange(), Isis::MosaicFindTool::mouseButtonRelease(), Isis::MosaicControlNetTool::mouseButtonRelease(), Isis::MosaicGridTool::setLatExtents(), Isis::MosaicGridTool::setLonExtents(), Isis::Projection::SetUnboundUniversalGround(), Isis::Projection::SetUniversalGround(), Isis::UniversalGroundMap::UniversalLatitude(), Isis::UniversalGroundMap::UniversalLongitude(), Isis::MosaicTrackTool::updateLabels(), and Isis::MosaicAreaTool::userChangedBox().

◆ qCompute()

double Isis::TProjection::qCompute ( const double sinPhi ) const

protectedinherited

A convience method to compute Snyder's q equation (3-12) for a given latitude, \(\phi\).

\[ q = (1 - e^2) \left[ \frac{\sin(\phi)}{1 - e^2 \sin^2(\phi)} - \frac{1}{2e} \ln\left(\frac{1 - e \sin(\phi)}{1 + e \sin(\phi)}\right) \right] \]

where \(e\) is the eccentricity for the body.

Parameters

sinPhi The sine value for a latitude, phi.

Exceptions

IException::Unknown - "Snyder's q variable should only be computed for ellipsoidal projections."

Returns: double Value for Snyder's q variable.

References _FILEINFO_, Isis::TProjection::m_eccentricity, and Isis::IException::Unknown.

◆ Resolution()

double Isis::Projection::Resolution ( ) const

inherited

This method returns the resolution for mapping world coordinates into projection coordinates.

For example, if the world coordinate system is an image then this routine returns the number of meters per pixel. Likewise, if the world coordinate system is a piece of paper, it might return the number of meters per inch of paper. If the SetWorldMapper method is not invoked then this method returns 1.0

Returns: double The resolution, in appropriate units.

References Isis::Projection::m_mapper, and Isis::WorldMapper::Resolution().

Referenced by Isis::ProcessExport::CreateWorldFile(), Isis::Projection::operator==(), and Isis::UniversalGroundMap::Resolution().

◆ Rotation()

double Isis::Projection::Rotation ( ) const

inherited

Returns the value of the Rotation keyword from the mapping group.

Returns: double The rotation of the map.

◆ Scale()

double Isis::TProjection::Scale ( ) const

virtualinherited

This method returns the scale for mapping world coordinates into projection coordinates.

For example, if the world coordinate system is an image then this routine returns the number of pixels per degree. Likewise, if the world coordinate system is a piece of paper, it might return the number of inches of paper per degree. If the SetWorldMapper method is not invoked then this method returns 1.0

Returns: double The scale for mapping.

Implements Isis::Projection.

References Isis::TProjection::m_equatorialRadius, Isis::Projection::m_mapper, Isis::TProjection::m_polarRadius, Isis::PI, Isis::WorldMapper::Resolution(), and Isis::TProjection::TrueScaleLatitude().

◆ SetComputedXY()

void Isis::Projection::SetComputedXY	(	double	x,
		double	y
	)

protectedinherited

This protected method is a helper for derived classes.

It takes unrotated x and y values, rotates them using the rotation angle data member, and stores the results in the current x and y data members.

Parameters

x	The unrotated x coordinate.
y	The unrotated y coordinate.

References Isis::Projection::m_good, Isis::Null, and Isis::PI.

◆ SetCoordinate()

bool Isis::Mercator::SetCoordinate	(	const double	x,
		const double	y
	)

virtual

This method is used to set the projection x/y.

The Set forces an attempted calculation of the corresponding latitude/longitude position. This may or may not be successful and a status is returned as such.

Parameters

x	X coordinate of the projection in units that are the same as the radii in the label
y	Y coordinate of the projection in units that are the same as the radii in the label

Returns: bool

Reimplemented from Isis::TProjection.

References Isis::Projection::GetX(), Isis::Projection::GetY(), Isis::HALFPI, Isis::TProjection::IsPlanetocentric(), Isis::TProjection::m_equatorialRadius, Isis::Projection::m_good, Isis::TProjection::m_latitude, Isis::TProjection::m_longitude, Isis::TProjection::m_longitudeDirection, Isis::TProjection::phi2Compute(), Isis::PI, Isis::TProjection::PositiveWest, Isis::Projection::SetXY(), and Isis::TProjection::ToPlanetocentric().

◆ SetGround()

bool Isis::Mercator::SetGround	(	const double	lat,
		const double	lon
	)

virtual

This method is used to set the latitude/longitude (assumed to be of the correct LatitudeType, LongitudeDirection, and LongitudeDomain.

The Set forces an attempted calculation of the projection X/Y values. This may or may not be successful and a status is returned as such.

Parameters

lat	Latitude value to project
lon	Longitude value to project

Returns: bool

Reimplemented from Isis::TProjection.

References Isis::TProjection::IsPlanetocentric(), Isis::TProjection::m_equatorialRadius, Isis::Projection::m_good, Isis::TProjection::m_latitude, Isis::TProjection::m_longitude, Isis::TProjection::m_longitudeDirection, Isis::PI, Isis::TProjection::PositiveWest, Isis::Projection::SetComputedXY(), Isis::TProjection::tCompute(), and Isis::TProjection::ToPlanetographic().

◆ setProjectionType()

void Isis::Projection::setProjectionType ( const ProjectionType ptype )

inherited

Sets the projection subclass type.

Parameters

ptype The projection subclass type

Referenced by Isis::RingPlaneProjection::RingPlaneProjection(), and Isis::TProjection::TProjection().

◆ SetUnboundUniversalGround()

bool Isis::TProjection::SetUnboundUniversalGround	(	const double	lat,
		const double	lon
	)

virtualinherited

This method is used to set the latitude/longitude.

The Set forces an attempted calculation of the projection X/Y values. This may or may not be successful and a status is returned as such. This version does not adjust the longitude based on the longitude domain.

Parameters

lat	Planetocentric Latitude value to project
lon	PositiveEast, Domain360 Longitude value to project

Returns: bool Indicates whether the method was successful.

Reimplemented from Isis::Projection.

References Isis::Projection::m_good, Isis::TProjection::m_latitude, Isis::TProjection::m_latitudeType, Isis::TProjection::m_longitude, Isis::TProjection::m_longitudeDirection, Isis::Null, Isis::TProjection::Planetographic, Isis::TProjection::PositiveWest, Isis::TProjection::SetGround(), and Isis::TProjection::ToPlanetographic().

Referenced by Isis::Projection::SetUnboundUniversalGround().

◆ SetUniversalGround()

bool Isis::TProjection::SetUniversalGround	(	const double	lat,
		const double	lon
	)

virtualinherited

This method is used to set the latitude/longitude which must be Planetocentric (latitude) and PositiveEast/Domain360 (longitude).

The Set forces an attempted calculation of the projection X/Y values. This may or may not be successful and a status is returned as such.

Parameters

lat	Planetocentric Latitude value to project
lon	PositiveEast, Domain360 Longitude value to project

Returns: bool Indicates whether the method was successful.

Reimplemented from Isis::Projection.

References Isis::Projection::m_good, Isis::TProjection::m_latitude, Isis::TProjection::m_latitudeType, Isis::TProjection::m_longitude, Isis::TProjection::m_longitudeDirection, Isis::TProjection::m_longitudeDomain, Isis::Null, Isis::TProjection::Planetographic, Isis::TProjection::PositiveWest, Isis::TProjection::SetGround(), Isis::TProjection::To180Domain(), Isis::TProjection::To360Domain(), and Isis::TProjection::ToPlanetographic().

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::MosaicGridTool::setLatExtents(), and Isis::Projection::SetUniversalGround().

◆ SetUpperLeftCorner()

void Isis::Projection::SetUpperLeftCorner	(	const Displacement &	x,
		const Displacement &	y
	)

inherited

This method is used to find the XY range for oblique aspect projections (non-polar projections) by "walking" around each of the min/max lat/lon.

Parameters

minX	Minimum x projection coordinate which covers the latitude longitude range specified in the labels.
maxX	Maximum x projection coordinate which covers the latitude longitude range specified in the labels.
minY	Minimum y projection coordinate which covers the latitude longitude range specified in the labels.
maxY	Maximum y projection coordinate which covers the latitude longitude range specified in the labels.

Returns: bool Indicates whether the method was successful.

See also: XYRange()

Author: Stephen Lambright This method searches for extreme (min/max/discontinuity) coordinate values along the constBorder line between minBorder and maxBorder (that is, across latitudes/longitudes). This method locates the extrema by utilizing the findExtreme() method until the coordinate values converge. Then, extremeVal parameter is updated with this value before returning.

Discontinuities are stored in m_specialLatCases and m_specialLonCases so they may be checked again later, which creates significantly more accuracy in some cases.

Parameters

minBorder	Minimum latitude or longitude to search between.
maxBorder	Maximum latitude or longitude to search between.
extremeVal	The resulting global coordinate value (min or max value for x or y, depending on findMin and searchX) on the constBorder.
constBorder	The latitude or longitude that remains constant. The method will step along this border.
searchX	Indicates whether the method is searching for a min or max x-coordinate. If false the method searches for min or max y-coordinate.
searchLongitude	Indicates whether the method will search along a longitude. If true, constBorder is longitude and all other borders are latitudes. If false, the method searches a latitude (constBorder is a lat, other borders lons).
findMin	Indicates whether the method is looking for a minimum coordinate value. If false, the method is looking for a maximum value.

Author: Steven Lambright Searches for extreme (min/max/discontinuity) coordinate values across latitudes/longitudes.

This method looks for these extrema along the constBorder between minBorder and maxBorder by stepping along constBorder (10 times) from the minBorder and maxBorder. Then, the range of this extreme value is recorded in minBorder and maxBorder and the coordinate values corresponding to these new borders are stored in minBorderX, minBorderY, maxBorderX and maxBorderY.

This function should be used by calling it repeatedly until minBorderX and minBorderY do not equal maxBorderX and maxBorderY, respectively. Discontinuities will cause the minBorderX, minBorderY, maxBorderX and maxBorderY to never converge. If minBorderX never comes close to maxBorderX or minBorderY never comes close to maxBorderY, then between minBorder and maxBorder is the value of the most extreme value. In this case, either the smaller or larger of the x or y values found will be correct, depending on the values of findMin and searchX.

Parameters

minBorder	Minimum latitude or longitude to search between. This value gets updated to a more precise range.
maxBorder	Maximum latitude or longitude to search between. This value gets updated to a more precise range.
minBorderX	The x-value corresponding to the lower resultant minBorder and the constBorder, which is more accurate when nearly equal to maxBorderX.
minBorderY	The y-value corresponding to the lower resultant minBorder and the constBorder, which is more accurate when nearly equal to maxBorderY.
maxBorderX	The x-value corresponding to the higher resultant maxBorder and the constBorder, which is more accurate when nearly equal to minBorderX.
maxBorderY	The y-value corresponding to the higher resultant maxBorder and the constBorder, which is more accurate when nearly equal to minBorderY.
constBorder	The latitude or longitude that remains constant. The method will step along this border.
searchX	Indicates whether the method is searching for a min or max x-coordinate. If false the method searches for min or max y-coordinate.
searchLongitude	Indicates whether the method will search along a longitude. If true, constBorder is longitude and all other borders are latitudes. If false, the method searches a latitude (constBorder is a lat, other borders lons).
findMin	Indicates whether the method is looking for a minimum coordinate value. If false, the method is looking for a maximum value.

Author: Stephen Lambright This function sets the ground for the given border values. It calls the SetGround(lat, lon) method with the appropriate lat/lon values, depending on whether variableIsLat is true.

This method is used by doSearch and findExtreme in order to set the ground correctly each time.

Parameters

variableBorder	The latitude or longitude that is variable in the search methods.
constBorder	The latitude or longitude that is constant in the search methods.
variableIsLat	Indicates whether variableBorder is the latittude value and constBorder is the longitude value. If false, variableBorder is the longitude value and constBorder is the latitude value.

Author: Stephen Lambright This method sets the UpperLeftCornerX and UpperLeftCornerY keywords in the projection mapping group, in meters.

Parameters

x	the upper left corner x value
y	the upper left corner y value

References Isis::PvlContainer::addKeyword(), Isis::Projection::m_mappingGrp, Isis::Displacement::meters(), Isis::PvlContainer::Replace, and Isis::toString().

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::ProjectionFactory::CreateFromCube(), Isis::ProjectionFactory::RingsCreateForCube(), and Isis::ProjectionFactory::RingsCreateFromCube().

◆ SetWorld()

bool Isis::Projection::SetWorld	(	const double	worldX,
		const double	worldY
	)

inherited

This method is used to set a world coordinate.

A world coordinate is a different coordinate type that has a one-to-one mapping to the projection coordinate system. For example, mapping pixel samples and lines to projection x's and y's. The Set forces an attempted calculation of the corresponding latitude/longitude position. This may or may not be successful and a status is returned as such. Note that is only applies if the Projection object was given an WorldMapper object during construction. If an WorldMapper was not supplied then SetWorld operates exactly the same as SetCoordinate (impling that world coordinate and projection coordinate are identical).

Parameters

worldX	World X coordinate in units that are specified by the WorldMapper object (e.g., pixels, millimeters, etc)
worldY	World Y coordinate in units that are specified by the WorldMapper object (e.g., pixels, millimeters, etc)

Returns: bool Indicates whether the method was successful.

References Isis::Projection::m_mapper, Isis::WorldMapper::ProjectionX(), Isis::WorldMapper::ProjectionY(), and Isis::Projection::SetCoordinate().

Referenced by Isis::ProcessExport::CreateWorldFile(), Isis::UniversalGroundMap::GroundRange(), Isis::Cube::latLonRange(), Isis::Chip::Load(), Isis::UniversalGroundMap::SetImage(), Isis::SubArea::UpdateLabel(), and Isis::PolygonTools::XYToLatLon().

◆ SetWorldMapper()

void Isis::Projection::SetWorldMapper ( WorldMapper * mapper )

inherited

If desired the programmer can use this method to set a world mapper to be used in the SetWorld, WorldX, and WorldY methods.

Mappers typically transform a projection coordinate (x/y) into the desired working coordinate system, for example, cube pixels or inches on a piece of paper. They transform in both directions (world to projection and projection to world). This allows for conversions from line/sample to latitude/longitude and vice versa. This projection will take ownership of the WorldMapper pointer.

Parameters

mapper Pointer to the mapper

References Isis::Projection::m_mapper.

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::ProjectionFactory::CreateFromCube(), Isis::ProjectionFactory::RingsCreateForCube(), and Isis::ProjectionFactory::RingsCreateFromCube().

◆ SetXY()

void Isis::Projection::SetXY	(	double	x,
		double	y
	)

protectedinherited

This protected method is a helper for derived classes.

It takes a rotated x,y and stores them in the current x and y data members.

Parameters

x	The rotated x coordinate.
y	The rotated y coordinate.

References Isis::Projection::m_good, and Isis::Null.

◆ tCompute()

double Isis::TProjection::tCompute	(	const double	phi,
		const double	sinphi
	)		const

protectedinherited

A convience method to compute Snyder's t equation (15-9) for a given latitude, \(\phi\).

\[ t = \frac{\tan\left(\frac{\pi}{4} - \frac{\phi}{2}\right)} {\left[\frac{1-e\sin(\phi)} {1+e\sin(\phi)}\right]^{e/2}} \]

where \(e\) is the eccentricity for the body.

Parameters

phi	phi
sinphi	sin of phi

Returns: double The value for Snyder's t variable.

References Isis::TProjection::Eccentricity(), and Isis::HALFPI.

Referenced by Isis::LambertConformal::LambertConformal(), Isis::PolarStereographic::PolarStereographic(), SetGround(), Isis::LambertConformal::SetGround(), and Isis::PolarStereographic::SetGround().

◆ To180Domain()

double Isis::TProjection::To180Domain ( const double lon )

staticinherited

This method converts a longitude into the -180 to 180 domain.

It will leave the longitude unchanged if it is already in the domain.

Parameters

lon	Longitude to convert into the -180 to 180 domain.

Exceptions

IException::Unknown - "The given longitude is invalid."

Returns: double The longitude, converted to 180 domain.

References _FILEINFO_, Isis::Angle::Degrees, Isis::Angle::degrees(), Isis::Longitude::force180Domain(), Isis::Null, Isis::toString(), and Isis::IException::Unknown.

Referenced by Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::TProjection::SetUniversalGround(), Isis::TProjection::ToPositiveEast(), Isis::TProjection::ToPositiveWest(), and Isis::SubArea::UpdateLabel().

◆ To360Domain()

double Isis::TProjection::To360Domain ( const double lon )

staticinherited

This method converts a longitude into the 0 to 360 domain.

It will leave the longitude unchanged if it is already in the domain.

Parameters

lon	Longitude to convert into the 0 to 360 domain.

Returns: double The longitude, converted to 360 domain.

References _FILEINFO_, Isis::Angle::Degrees, Isis::Angle::degrees(), Isis::Longitude::force360Domain(), Isis::Null, Isis::toString(), and Isis::IException::Unknown.

Referenced by Isis::TProjection::inLongitudeRange(), Isis::Stereo::rectangular(), Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::TProjection::SetUniversalGround(), Isis::TProjection::ToPositiveEast(), Isis::TProjection::ToPositiveWest(), Isis::TProjection::UniversalLongitude(), and Isis::Orthographic::XYRange().

◆ ToDMS()

QString Isis::Projection::ToDMS ( double angle )

staticinherited

Converts the given angle (in degrees) to degrees, minutes, seconds.

Outputs in the form xxx yym zz.zzzs, for example, 206.291 degrees is 206 17m 27.6s

Parameters

angle Angle in degrees to be converted to degrees, minutes, seconds

Returns: string The angle in Degrees, minutes, seconds

◆ ToHMS()

QString Isis::Projection::ToHMS ( double angle )

staticinherited

Converts the given angle (in degrees) to hours, minutes, seconds.

Outputs in the form xxh yym zz.zzzs For example, 206.291 will be 13h 45m 09.84s

Parameters

angle Angle in degrees to be converted to hours, minutes, seconds

Returns: string The angle in Hours, minutes, seconds

References Isis::Projection::ToHours().

◆ ToHours()

double Isis::Projection::ToHours ( double angle )

staticinherited

Converts the given angle (in degrees) to hours by using the ratio 15 degrees per hour.

Parameters

angle Angle in degrees to be converted to hours

Returns: double The number of hours for the given angle.

Referenced by Isis::Projection::ToHMS().

◆ ToPlanetocentric() [1/2]

double Isis::TProjection::ToPlanetocentric ( const double lat ) const

inherited

This method converts a planetographic latitude to a planetocentric latitude.

It utilizes the equatorial and polar radii found in the labels to perform the computation.

Parameters

lat	Planetographic latitude to convert.

See also: ToPlanetocentric(lat, eRadius, pRadius)

Returns: double The latitude, converted to planetocentric.

References Isis::TProjection::m_equatorialRadius, and Isis::TProjection::m_polarRadius.

Referenced by Isis::LunarAzimuthalEqualArea::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), SetCoordinate(), Isis::LambertConformal::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Orthographic::SetCoordinate(), and Isis::TProjection::UniversalLatitude().

◆ ToPlanetocentric() [2/2]

double Isis::TProjection::ToPlanetocentric	(	double	lat,
		double	eRadius,
		double	pRadius
	)

staticinherited

This method converts a planetographic latitude to a planetocentric latitude.

Parameters

lat	Planetographic latitude to convert.
eRadius	Equatorial radius.
pRadius	Polar radius

Exceptions

IException::Unknown - "The given latitude is invalid."

Returns: double The latitude, converted to planetocentric.

References _FILEINFO_, Isis::Null, Isis::PI, Isis::toString(), and Isis::IException::Unknown.

◆ ToPlanetographic() [1/2]

double Isis::TProjection::ToPlanetographic ( const double lat ) const

inherited

This method converts a planetocentric latitude to a planetographic latitude.

It utilizes the equatorial and polar radii found in the labels to perform the computation.

Parameters

lat	Planetocentric latitude to convert.

See also: ToPlanetographic(lat, eRadius, pRadius)

Returns: double The latitude, converted to planetographic.

References Isis::TProjection::m_equatorialRadius, and Isis::TProjection::m_polarRadius.

Referenced by Isis::LambertConformal::LambertConformal(), Mercator(), Isis::ObliqueCylindrical::ObliqueCylindrical(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::LunarAzimuthalEqualArea::SetGround(), Isis::PointPerspective::SetGround(), Isis::TransverseMercator::SetGround(), SetGround(), Isis::LambertConformal::SetGround(), Isis::PolarStereographic::SetGround(), Isis::Orthographic::SetGround(), Isis::TProjection::SetUnboundUniversalGround(), Isis::TProjection::SetUniversalGround(), Isis::TransverseMercator::TransverseMercator(), and Isis::SubArea::UpdateLabel().

◆ ToPlanetographic() [2/2]

double Isis::TProjection::ToPlanetographic	(	double	lat,
		double	eRadius,
		double	pRadius
	)

staticinherited

This method converts a planetocentric latitude to a planetographic latitude.

It is static so that a projection object does not need to exist.

Parameters

lat	Planetocentric latitude to convert.
eRadius	Equatorial radius.
pRadius	Polar radius

Exceptions

IException::Unknown - "The given latitude is invalid."

Returns: double The latitude, converted to planetographic.

References _FILEINFO_, Isis::Null, Isis::PI, Isis::toString(), and Isis::IException::Unknown.

◆ ToPositiveEast()

double Isis::TProjection::ToPositiveEast	(	const double	lon,
		const int	domain
	)

staticinherited

This method converts a longitude into the positive east direction.

Parameters

lon	Longitude to convert into the positive east direction.
domain	Must be an integer value of 180 (for -180 to 180) or 360 (for 0 to 360).

Exceptions

IException::Unknown	- "The given longitude is invalid."
IException::Unknown	- "Unable to convert longitude. Domain is not 180 or 360."

Returns: double Longitude value, in positive east direction.

References _FILEINFO_, Isis::Null, Isis::TProjection::To180Domain(), Isis::TProjection::To360Domain(), Isis::toString(), and Isis::IException::Unknown.

◆ ToPositiveWest()

double Isis::TProjection::ToPositiveWest	(	const double	lon,
		const int	domain
	)

staticinherited

This method converts a longitude into the positive west direction.

Parameters

lon	Longitude to convert into the positive west direction.
domain	Must be an integer value of 180 (for -180 to 180) or 360 (for 0 to 360).

Exceptions

IException::Unknown	- "The given longitude is invalid."
IException::Unknown	- "Unable to convert longitude. Domain is not 180 or 360."

Returns: double Longitude value, in positive west direction.

References _FILEINFO_, Isis::Null, Isis::TProjection::To180Domain(), Isis::TProjection::To360Domain(), Isis::toString(), and Isis::IException::Unknown.

Referenced by Isis::SubArea::UpdateLabel().

◆ ToProjectionX()

double Isis::Projection::ToProjectionX ( const double worldX ) const

inherited

This method converts a world x value to a projection x value.

For example, if the world coordinate system is an image then this method converts a sample position to a projection x value. Note that if SetWorldMapper is not used then this routine simply returns the value of the argument. That is, no mapping occurs.

Parameters

worldX World x coordinate

Exceptions

IException::Unknown - "The given x-value is invalid."

Returns: double The projection X coordinate value.

References _FILEINFO_, Isis::Projection::m_mapper, Isis::Null, Isis::WorldMapper::ProjectionX(), and Isis::IException::Unknown.

Referenced by Isis::OverlapStatistics::OverlapStatistics(), and Isis::ProcessMapMosaic::StartProcess().

◆ ToProjectionY()

double Isis::Projection::ToProjectionY ( const double worldY ) const

inherited

This method converts a world y value to a projection y value.

For example, if the world coordinate system is an image then this method converts a line position to a projection y value. Note that if SetWorldMapper is not used then this routine simply returns the value of the argument. That is, no mapping occurs.

Parameters

worldY World y coordinate

Exceptions

IException::Unknown - "The given y-value is invalid."

Returns: double The projection Y coordinate value.

References _FILEINFO_, Isis::Projection::m_mapper, Isis::Null, Isis::WorldMapper::ProjectionY(), and Isis::IException::Unknown.

Referenced by Isis::OverlapStatistics::OverlapStatistics(), and Isis::ProcessMapMosaic::StartProcess().

◆ ToWorldX()

double Isis::Projection::ToWorldX ( const double projectionX ) const

inherited

This method converts a projection x value to a world x value.

For example, if the world coordinate system is an image then this method converts a projection x to a sample position. Note that if SetWorldMapper is not used then this routine simply returns the value of the argument. That is, no mapping occurs.

Parameters

projectionX Projection x value in meters

Exceptions

IException::Unknown - "The given x-value is invalid."

Returns: double The world X coordinate value.

References _FILEINFO_, Isis::Projection::m_mapper, Isis::Null, Isis::IException::Unknown, and Isis::WorldMapper::WorldX().

Referenced by Isis::OverlapStatistics::OverlapStatistics(), Isis::ProcessMapMosaic::RingsSetOutputCube(), Isis::ProcessMapMosaic::SetOutputCube(), and Isis::ProcessMapMosaic::StartProcess().

◆ ToWorldY()

double Isis::Projection::ToWorldY ( const double projectionY ) const

inherited

This method converts a projection y value to a world y value.

For example, if the world coordinate system is an image then this method converts a projection y to a line position. Note that if SetWorldMapper is not used then this routine simply returns the value of the argument. That is, no mapping occurs.

Parameters

projectionY Projection y value in meters

Exceptions

IException::Unknown - "The given y-value is invalid."

Returns: double The world Y coordinate value.

References _FILEINFO_, Isis::Projection::m_mapper, Isis::Null, Isis::IException::Unknown, and Isis::WorldMapper::WorldY().

Referenced by Isis::OverlapStatistics::OverlapStatistics(), Isis::ProcessMapMosaic::RingsSetOutputCube(), Isis::ProcessMapMosaic::SetOutputCube(), and Isis::ProcessMapMosaic::StartProcess().

◆ TrueScaleLatitude()

double Isis::Mercator::TrueScaleLatitude ( ) const

virtual

Returns the latitude of true scale in degrees.

For Mercator projections, it is the center latitude.

Returns: double The center latitude, in degrees.

Reimplemented from Isis::TProjection.

References Isis::PI.

◆ UniversalLatitude()

double Isis::TProjection::UniversalLatitude ( )

inherited

This returns a universal latitude (planetocentric).

The method can only be used if SetGround, SetCoordinate, SetUniversalGround, or SetWorld return with success. Success can also be checked using the IsGood method.

Returns: double The universal latitude.

References Isis::TProjection::m_latitude, Isis::TProjection::m_latitudeType, Isis::TProjection::Planetographic, and Isis::TProjection::ToPlanetocentric().

Referenced by Isis::UniversalGroundMap::GroundRange(), Isis::Cube::latLonRange(), Isis::Chip::Load(), Isis::UniversalGroundMap::UniversalLatitude(), and Isis::SubArea::UpdateLabel().

◆ UniversalLongitude()

double Isis::TProjection::UniversalLongitude ( )

inherited

This returns a universal longitude (positive east in 0 to 360 domain).

The method can only be used if SetGround, SetCoordinate, SetUniversalGround, or SetWorld return with success. Success can also be checked using the IsGood method.

Returns: double The universal longitude.

References Isis::TProjection::m_longitude, Isis::TProjection::m_longitudeDirection, Isis::TProjection::PositiveWest, and Isis::TProjection::To360Domain().

Referenced by Isis::UniversalGroundMap::GroundRange(), Isis::Cube::latLonRange(), Isis::Chip::Load(), Isis::UniversalGroundMap::UniversalLongitude(), and Isis::SubArea::UpdateLabel().

◆ Version()

QString Isis::Mercator::Version ( ) const

virtual

Returns the version of the map projection.

Returns: QString Version number

Implements Isis::TProjection.

◆ WorldX()

double Isis::Projection::WorldX ( ) const

inherited

This returns the world X coordinate provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success.

Success can also be checked using the IsGood method. The units of X will be in the units as specified by the WorldMapper object which was given to the SetWorldMapper method. If a mapper object was not given then world coordinates are the same as the projection coordinates (i.e., WorldX and XCoord will return the same value).

Returns: double The world X coordinate.

References Isis::Projection::m_mapper, and Isis::WorldMapper::WorldX().

Referenced by Isis::Chip::Load(), Isis::DemShape::localRadius(), Isis::UniversalGroundMap::Sample(), Isis::Camera::SetRightAscensionDeclination(), and Isis::ProcessMapMosaic::StartProcess().

◆ WorldY()

double Isis::Projection::WorldY ( ) const

inherited

This returns the world Y coordinate provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success.

Success can also be checked using the IsGood method. The units of Y will be in the units as specified by the WorldMapper object which was given to the SetWorldMapper. If a mapper object was not given then world coordinates are the same as the projection coordinates (i.e., WorldY and YCoord will return the same value).

Returns: double The world Y coordinate.

References Isis::Projection::m_mapper, and Isis::WorldMapper::WorldY().

Referenced by Isis::UniversalGroundMap::Line(), Isis::Chip::Load(), Isis::DemShape::localRadius(), and Isis::Camera::SetRightAscensionDeclination().

◆ XCoord()

double Isis::Projection::XCoord ( ) const

inherited

This returns the projection X provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success.

Success can also be checked using the IsGood method. The units of X will be in the same . units as the radii obtained from the label.

Returns: double

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::ProcessExport::CreateWorldFile(), Isis::MosaicFindTool::getUserGroundPoint(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::PolygonTools::LatLonToXY(), Isis::MosaicSceneItem::reproject(), Isis::ProjectionFactory::RingsCreateForCube(), Isis::RingPlaneProjection::SetCoordinate(), Isis::TProjection::SetCoordinate(), Isis::MosaicGridTool::setLatExtents(), Isis::SubArea::UpdateLabel(), Isis::MosaicAreaTool::userChangedBox(), Isis::PointPerspective::XYRange(), Isis::LambertConformal::XYRange(), Isis::RingPlaneProjection::XYRangeCheck(), and Isis::TProjection::XYRangeCheck().

◆ XYRange()

bool Isis::Mercator::XYRange	(	double &	minX,
		double &	maxX,
		double &	minY,
		double &	maxY
	)

virtual

This method is used to determine the x/y range which completely covers the area of interest specified by the lat/lon range.

The latitude/longitude range may be obtained from the labels. The purpose of this method is to return the x/y range so it can be used to compute how large a map may need to be. For example, how big a piece of paper is needed or how large of an image needs to be created. The method may fail as indicated by its return value.

Parameters

minX	Minimum x projection coordinate which covers the latitude longitude range specified in the labels.
maxX	Maximum x projection coordinate which covers the latitude longitude range specified in the labels.
minY	Minimum y projection coordinate which covers the latitude longitude range specified in the labels.
maxY	Maximum y projection coordinate which covers the latitude longitude range specified in the labels.

Returns: bool

Reimplemented from Isis::TProjection.

References Isis::TProjection::m_maximumLatitude, Isis::TProjection::m_maximumLongitude, Isis::Projection::m_maximumX, Isis::Projection::m_maximumY, Isis::TProjection::m_minimumLatitude, Isis::TProjection::m_minimumLongitude, Isis::Projection::m_minimumX, Isis::Projection::m_minimumY, and Isis::TProjection::XYRangeCheck().

◆ XYRangeCheck()

void Isis::TProjection::XYRangeCheck	(	const double	latitude,
		const double	longitude
	)

protectedvirtualinherited

This convience function is established to assist in the development of the XYRange virtual method.

It allows the developer to test ground points (lat/lon) to see if they produce a minimum/maximum projection coordinate.

This method will first verify that the given latitude and longitude values are not Null. If so, the method will change the status of the object to good=false before returning (i.e IsGood() returns false).

If both of those test pass, it attempts to set the ground to the given latitude and longitude and, if successful, compares the new x and y with the saved min/max x and y values.

For example in Sinusoidal this method is called in the following way:

 bool Sinusoidal::XYRange(double &minX, double &maxX,
                          double &minY, double &maxY) {
   // Check the corners of the lat/lon range
   XYRangeCheck (m_minimumLatitude,m_minimumLongitude);
   XYRangeCheck (m_maximumLatitude,m_minimumLongitude);
   XYRangeCheck (m_minimumLatitude,m_maximumLongitude);
   XYRangeCheck (m_maximumLatitude,m_maximumLongitude);
   // In case the latitude crosses the equator, check there
   if (inLatitudeRange(0.0)) {
     XYRangeCheck (0.0,m_minimumLongitude);
     XYRangeCheck (0.0,m_maximumLongitude);
   }
   // Make sure everything is ordered
   if (m_minimumX >= m_maximumX) return false;
   if (m_minimumY >= m_maximumY) return false;
   // Return X/Y min/maxs
   minX = m_minimumX;
   maxX = m_maximumX;
   minY = m_minimumY;
   maxY = m_maximumY;
   return true;
}

Note: It is a good habit to call the inLatitudeRange and inLongitudeRange functions to verify that the values are in range before passing it to XYRangeCheck.

See also: inLongitudeRange(minLon, maxLon, longitude); inLongitudeRange(longitude); inLatitudeRange(latitude)

Parameters

latitude	Test for min/max projection coordinates at this latitude
longitude	Test for min/max projection coordinates at this longitude

Implements Isis::Projection.

References Isis::Projection::IsGood(), Isis::Projection::m_good, Isis::Projection::m_maximumX, Isis::Projection::m_maximumY, Isis::Projection::m_minimumX, Isis::Projection::m_minimumY, Isis::Null, Isis::TProjection::SetGround(), Isis::Projection::XCoord(), and Isis::Projection::YCoord().

Referenced by Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), and Isis::Orthographic::XYRange().

◆ xyRangeOblique()

bool Isis::TProjection::xyRangeOblique	(	double &	minX,
		double &	maxX,
		double &	minY,
		double &	maxY
	)

protectedinherited

This method is used to find the XY range for oblique aspect projections (non-polar projections) by "walking" around each of the min/max lat/lon.

Parameters

minX	Minimum x projection coordinate which covers the latitude longitude range specified in the labels.
maxX	Maximum x projection coordinate which covers the latitude longitude range specified in the labels.
minY	Minimum y projection coordinate which covers the latitude longitude range specified in the labels.
maxY	Maximum y projection coordinate which covers the latitude longitude range specified in the labels.

Returns: bool Indicates whether the method was successful.

See also: XYRange()

Author: Stephen Lambright

References Isis::Projection::HasGroundRange(), Isis::Projection::m_maximumX, Isis::Projection::m_maximumY, Isis::Projection::m_minimumX, Isis::Projection::m_minimumY, Isis::TProjection::MaximumLatitude(), Isis::TProjection::MaximumLongitude(), Isis::TProjection::MinimumLatitude(), Isis::TProjection::MinimumLongitude(), and Isis::Null.

Referenced by Isis::ObliqueCylindrical::XYRange().

◆ YCoord()

double Isis::Projection::YCoord ( ) const

inherited

This returns the projection Y provided SetGround, SetCoordinate, SetUniversalGround, or SetWorld returned with success.

Success can also be checked using the IsGood method. The units of Y will be in the same units as the radii obtained from the label.

Returns: double

Referenced by Isis::ProjectionFactory::CreateForCube(), Isis::ProcessExport::CreateWorldFile(), Isis::MosaicFindTool::getUserGroundPoint(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::PolygonTools::LatLonToXY(), Isis::MosaicSceneItem::reproject(), Isis::ProjectionFactory::RingsCreateForCube(), Isis::RingPlaneProjection::SetCoordinate(), Isis::TProjection::SetCoordinate(), Isis::MosaicGridTool::setLatExtents(), Isis::SubArea::UpdateLabel(), Isis::MosaicAreaTool::userChangedBox(), Isis::PointPerspective::XYRange(), Isis::LambertConformal::XYRange(), Isis::RingPlaneProjection::XYRangeCheck(), and Isis::TProjection::XYRangeCheck().

Member Data Documentation

◆ m_eccentricity

double Isis::TProjection::m_eccentricity

protectedinherited

The eccentricity of the target body.

Referenced by Isis::TProjection::Eccentricity(), Isis::TProjection::qCompute(), and Isis::TProjection::TProjection().

◆ m_equatorialRadius

double Isis::TProjection::m_equatorialRadius

protectedinherited

Polar radius of the target.

This is a unitless value so that if the radii are in inches then the m_x and m_y will be in inches. This value is set on construction. It is either read directly from the mapping group of the given PVL label or it is found in NAIF kernels by using the Target value in the given label. When pulled from NAIF kernels, the equatorial radius is the first value of NAIF's radii array.

◆ m_good

bool Isis::Projection::m_good

protectedinherited

Indicates if the contents of m_x, m_y, m_latitude, and m_longitude are valid.

◆ m_groundRangeGood

bool Isis::Projection::m_groundRangeGood

protectedinherited

Indicates if the ground range (min/max lat/lons) were read from the labels.

Referenced by Isis::Projection::HasGroundRange(), Isis::RingPlaneProjection::RingPlaneProjection(), Isis::TProjection::TProjection(), Isis::RingPlaneProjection::XYRange(), and Isis::TProjection::XYRange().

◆ m_latitude

double Isis::TProjection::m_latitude

protectedinherited

This contains the currently set latitude value.

The value is only usable if m_good is true.

◆ m_latitudeType

LatitudeType Isis::TProjection::m_latitudeType

protectedinherited

An enumerated type indicating the LatitudeType read from the labels.

It can be either Planetographic or Planetocentric.

Referenced by Isis::TProjection::IsPlanetocentric(), Isis::TProjection::IsPlanetographic(), Isis::TProjection::LatitudeTypeString(), Isis::TProjection::SetUnboundUniversalGround(), Isis::TProjection::SetUniversalGround(), Isis::TProjection::TProjection(), and Isis::TProjection::UniversalLatitude().

◆ m_longitude

double Isis::TProjection::m_longitude

protectedinherited

This contains the currently set longitude value.

The value is only usable if m_good is true.

◆ m_longitudeDirection

LongitudeDirection Isis::TProjection::m_longitudeDirection

protectedinherited

An enumerated type indicating the LongitudeDirection read from the labels.

It can be either PositiveEast or PositiveWest. Indicating which direction the positive axis for longitude is.

◆ m_longitudeDomain

int Isis::TProjection::m_longitudeDomain

protectedinherited

This integer is either 180 or 360 and is read from the labels.

It represents the longitude domain when returning values through Longitude method. The domain is either -180 to 180 or 0 to 360.

Referenced by Isis::TProjection::Has180Domain(), Isis::TProjection::Has360Domain(), Isis::TProjection::LongitudeDomainString(), Isis::PointPerspective::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::TProjection::SetUniversalGround(), and Isis::TProjection::TProjection().

◆ m_mapper

WorldMapper* Isis::Projection::m_mapper

protectedinherited

This points to a mapper passed into the SetWorldMapper method.

This mapper allows the programmer to specify a different world coordinate system. Thus the programmer could pass in line/sample positions in order to obtain a latitude/longitude or set a lat/lon and get a line/sample.

Referenced by Isis::Projection::Projection(), Isis::Projection::Resolution(), Isis::RingPlaneProjection::Scale(), Isis::TProjection::Scale(), Isis::Projection::SetWorld(), Isis::Projection::SetWorldMapper(), Isis::Projection::ToProjectionX(), Isis::Projection::ToProjectionY(), Isis::Projection::ToWorldX(), Isis::Projection::ToWorldY(), Isis::Projection::WorldX(), Isis::Projection::WorldY(), and Isis::Projection::~Projection().

◆ m_mappingGrp

PvlGroup Isis::Projection::m_mappingGrp

protectedinherited

Mapping group that created this projection.

◆ m_maximumLatitude

double Isis::TProjection::m_maximumLatitude

protectedinherited

Contains the maximum latitude for the entire ground range.

Only usable if m_groundRangeGood is true.

Referenced by Isis::Equirectangular::Equirectangular(), Isis::LambertConformal::LambertConformal(), Isis::TProjection::MaximumLatitude(), Mercator(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::TProjection::TProjection(), Isis::TransverseMercator::TransverseMercator(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), and Isis::TProjection::XYRange().

◆ m_maximumLongitude

double Isis::TProjection::m_maximumLongitude

protectedinherited

Contains the maximum longitude for the entire ground range.

Only usable if m_groundRangeGood is true.

Referenced by Isis::Equirectangular::Equirectangular(), Isis::LambertConformal::LambertConformal(), Isis::TProjection::MaximumLongitude(), Mercator(), Isis::Mollweide::Mollweide(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::Robinson::Robinson(), Isis::SimpleCylindrical::SimpleCylindrical(), Isis::Sinusoidal::Sinusoidal(), Isis::TProjection::TProjection(), Isis::TransverseMercator::TransverseMercator(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), and Isis::TProjection::XYRange().

◆ m_maximumX

double Isis::Projection::m_maximumX

protectedinherited

See minimumX description.

Referenced by Isis::Projection::Projection(), Isis::RingCylindrical::XYRange(), Isis::Planar::XYRange(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), Isis::RingPlaneProjection::XYRangeCheck(), Isis::TProjection::XYRangeCheck(), and Isis::TProjection::xyRangeOblique().

◆ m_maximumY

double Isis::Projection::m_maximumY

protectedinherited

See minimumX description.

Referenced by Isis::Projection::Projection(), Isis::RingCylindrical::XYRange(), Isis::Planar::XYRange(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), Isis::RingPlaneProjection::XYRangeCheck(), Isis::TProjection::XYRangeCheck(), and Isis::TProjection::xyRangeOblique().

◆ m_minimumLatitude

double Isis::TProjection::m_minimumLatitude

protectedinherited

Contains the minimum latitude for the entire ground range.

Only usable if m_groundRangeGood is true.

Referenced by Isis::Equirectangular::Equirectangular(), Isis::LambertConformal::LambertConformal(), Mercator(), Isis::TProjection::MinimumLatitude(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::TProjection::TProjection(), Isis::TransverseMercator::TransverseMercator(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), and Isis::TProjection::XYRange().

◆ m_minimumLongitude

double Isis::TProjection::m_minimumLongitude

protectedinherited

Contains the minimum longitude for the entire ground range.

Only usable if m_groundRangeGood is true.

Referenced by Isis::Equirectangular::Equirectangular(), Isis::LambertConformal::LambertConformal(), Mercator(), Isis::TProjection::MinimumLongitude(), Isis::Mollweide::Mollweide(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::Robinson::Robinson(), Isis::SimpleCylindrical::SimpleCylindrical(), Isis::Sinusoidal::Sinusoidal(), Isis::TProjection::TProjection(), Isis::TransverseMercator::TransverseMercator(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), and Isis::TProjection::XYRange().

◆ m_minimumX

double Isis::Projection::m_minimumX

protectedinherited

The data elements m_minimumX, m_minimumY, m_maximumX, and m_maximumY are convience data elements when you write the XYRange virtual function.

They are used in conjuction with the XYRangeCheck convience method. After utilizing XYRangeCheck to test boundary conditions in the XYRange method these values will contain the projection x/y coverage for the ground range specified by min/max lat/lon.

Referenced by Isis::Projection::Projection(), Isis::RingCylindrical::XYRange(), Isis::Planar::XYRange(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), Isis::RingPlaneProjection::XYRangeCheck(), Isis::TProjection::XYRangeCheck(), and Isis::TProjection::xyRangeOblique().

◆ m_minimumY

double Isis::Projection::m_minimumY

protectedinherited

See minimumX description.

Referenced by Isis::Projection::Projection(), Isis::RingCylindrical::XYRange(), Isis::Planar::XYRange(), Isis::LunarAzimuthalEqualArea::XYRange(), Isis::Mollweide::XYRange(), Isis::Robinson::XYRange(), Isis::TransverseMercator::XYRange(), XYRange(), Isis::LambertConformal::XYRange(), Isis::PolarStereographic::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Equirectangular::XYRange(), Isis::Sinusoidal::XYRange(), Isis::Orthographic::XYRange(), Isis::RingPlaneProjection::XYRangeCheck(), Isis::TProjection::XYRangeCheck(), and Isis::TProjection::xyRangeOblique().

◆ m_polarRadius

double Isis::TProjection::m_polarRadius

protectedinherited

Polar radius of the target.

This is a unitless value so that if the radii are in inches then the m_x and m_y will be in inches. Of course the units must be the same as the equatorial radius. This value is set on construction. It is either read directly from the mapping group of the given PVL label or it is found in NAIF kernels by using the Target value in the given label.When pulled from NAIF kernels, the equatorial radius is the third value of NAIF's radii array.

Referenced by Isis::TProjection::LocalRadius(), Isis::TProjection::PolarRadius(), Isis::TProjection::Scale(), Isis::TProjection::ToPlanetocentric(), Isis::TProjection::ToPlanetographic(), and Isis::TProjection::TProjection().

◆ m_sky

bool Isis::Projection::m_sky

protectedinherited

Indicates whether projection is sky or land.

Referenced by Isis::Projection::IsSky(), and Isis::Projection::Projection().

The documentation for this class was generated from the following files:

/usgs/pkgs/isis3.9.0_docs/ISIS3/isis/src/base/objs/Mercator/Mercator.h
/usgs/pkgs/isis3.9.0_docs/ISIS3/isis/src/base/objs/Mercator/Mercator.cpp

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ LatitudeType

◆ LongitudeDirection

◆ ProjectionType

Constructor & Destructor Documentation

◆ Mercator()

◆ ~Mercator()

Member Function Documentation

◆ e4Compute()

◆ Eccentricity()

◆ EquatorialRadius()

◆ GetX()

◆ GetY()

◆ Has180Domain()

◆ Has360Domain()

◆ HasGroundRange()

◆ inLatitudeRange()

◆ inLongitudeRange() [1/2]

◆ inLongitudeRange() [2/2]

◆ IsEquatorialCylindrical()

◆ IsGood()

◆ IsPlanetocentric()

◆ IsPlanetographic()

◆ IsPositiveEast()

◆ IsPositiveWest()

◆ IsSky()

◆ Latitude()

◆ LatitudeTypeString()

◆ LocalRadius() [1/2]

◆ LocalRadius() [2/2]

◆ Longitude()

◆ LongitudeDirectionString()

◆ LongitudeDomainString()

◆ Mapping()

◆ MappingLatitudes()

◆ MappingLongitudes()

◆ MaximumLatitude()

◆ MaximumLongitude()

◆ mCompute()

◆ MinimumLatitude()

◆ MinimumLongitude()

◆ Name()

◆ operator!=()

◆ operator==()

◆ phi2Compute()

◆ PixelResolution()

◆ PolarRadius()

◆ projectionType()

◆ qCompute()

◆ Resolution()

◆ Rotation()

◆ Scale()

◆ SetComputedXY()

◆ SetCoordinate()

◆ SetGround()

◆ setProjectionType()

◆ SetUnboundUniversalGround()

◆ SetUniversalGround()

◆ SetUpperLeftCorner()

◆ SetWorld()

◆ SetWorldMapper()

◆ SetXY()

◆ tCompute()

◆ To180Domain()

◆ To360Domain()

◆ ToDMS()

◆ ToHMS()

◆ ToHours()

◆ ToPlanetocentric() [1/2]

◆ ToPlanetocentric() [2/2]

◆ ToPlanetographic() [1/2]

◆ ToPlanetographic() [2/2]

◆ ToPositiveEast()

◆ ToPositiveWest()