Base class for Map Projections. More...

#include <Projection.h>

Inheritance diagram for Isis::Projection:

Collaboration diagram for Isis::Projection:

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

Public Member Functions
	Projection (Pvl &label)
	Constructs an empty Projection object.

virtual	~Projection ()
	Destroys the Projection object.

virtual bool	operator== (const Projection &proj)
	This method determines whether two map projection objects are equal by comparing the resolution, and projection name.

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

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

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

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

virtual QString	Name () const =0
	This method returns the name of the map projection.

virtual double	LocalRadius () const =0

virtual QString	Version () const =0
	This method returns the Version of the map projection.

virtual bool	IsEquatorialCylindrical ()
	This method returns true if the projection is equatorial cylindrical.

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

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

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.

virtual bool	SetGround (const double lat, const double lon)=0

virtual bool	SetCoordinate (const double x, const double y)=0

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

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

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

virtual bool	SetUniversalGround (const double coord1, const double coord2)
	This method is used to set the lat/lon or radius/azimuth (i.e.

virtual bool	SetUnboundUniversalGround (const double coord1, const double coord2)
	This method is used to set the lat/lon or radius/azimuth (i.e.

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

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

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

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

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

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

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

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

virtual double	Scale () const =0

virtual bool	XYRange (double &minX, double &maxX, double &minY, double &maxY)=0

void	SetUpperLeftCorner (const Displacement &x, const Displacement &y)
	This method searches for extreme (min/max/discontinuity) coordinate values along the constBorder line between minBorder and maxBorder (that is, across latitudes/longitudes).

virtual PvlGroup	Mapping ()=0

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

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

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

Protected Member Functions
virtual void	XYRangeCheck (const double latitude, const double longitude)=0

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

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

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

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

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

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

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

bool	m_sky
	Indicates whether projection is sky or land.

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

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.

double	m_maximumX
	See minimumX description.

double	m_minimumY
	See minimumX description.

double	m_maximumY
	See minimumX description.

PvlGroup	m_mappingGrp
	Mapping group that created this projection.

Detailed Description

Base class for Map Projections.

This is a virtual base class for map projections. It must be used to create specific map projection classes such as Sinusoidal, Mercator, etc. The foundation of this class is the ability to convert ground coordinates (latitude and longitude) into projection coordinates (x and y) and vice versa. Options exist to allow conversion to and from programmer specified world coordinates. The world coordinates can be cube pixels, paper units in millimeters, or any other unit the program may need. Generally, you should never directly instantiate this class.

Here is an example of how to use Projection

Pvl lab;
lab.Read("projection.map");
Projection *p = ProjectionFactory::Create(lab);

If you would like to see Projection being used in implementation, see mappos.cpp

Author: 2003-01-29 Jeff Anderson

Member Enumeration Documentation

◆ ProjectionType

enum Isis::Projection::ProjectionType

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

◆ Projection()

Isis::Projection::Projection ( Pvl & label )

Constructs an empty Projection object.

Parameters

label

A PVL object containing map projection labels. These labels are fully described in the Isis Map Projection Users Guide. A brief example follows:

  Group = Mapping
    EquatorialRadius = 3396190.0
    PolarRadius = 3376200.0
    LongitudeDirection = PositiveEast
    LongitudeDomain = 360
    LatitudeType = Planetographic
    MinimumLatitude = 10.8920539924144
    MaximumLatitude = 34.7603960060206
    MinimumLongitude = 219.72432466275
    MaximumLongitude = 236.186050244411
    PixelResolution = 1387.31209461362
    ProjectionName = SimpleCylindrical
    CenterLongitude = 220.0
  EndGroup
End

Exceptions

IException::Unknown	- "Projection failed. No target radii available through keywords [EquatorialRadius and PolarRadius] or [TargetName]."
IException::Unknown	- "Projection failed. Invalid value for keyword [EquatorialRadius]. It must be greater than zero."
IException::Unknown	- "Projection failed. Invalid value for keyword [PolarRadius]. It must be greater than zero."
IException::Unknown	- "Projection failed. Invalid value for keyword [LatitudeType] must be [Planetographic or Planetocentric]"
IException::Unknown	- "Projection failed. Invalid value for keyword [LongitudeDirection] must be [PositiveWest or PositiveEast]"
IException::Unknown	- "Projection failed. Invalid value for keyword [LongitudeDomain] must be [180 or 360]"
IException::Unknown	- "Projection failed. [MinimumLatitude] is outside the range of [-90:90]"
IException::Unknown	- "Projection failed. [MaximumLatitude] is outside the range of [-90:90]"
IException::Unknown	- "Projection failed. [MinimumLatitude,MaximumLatitude] are not properly ordered"
IException::Unknown	- "Projection failed. [MinimumLongitude,MaximumLongitude] are not properly ordered"
IException::Unknown	- "Projection failed. Invalid keyword value(s). [EquatorialRadius] must be greater than or equal to [PolarRadius]"
IException::Unknown	- "Projection failed. Invalid label group [Mapping]"

References _FILEINFO_, Isis::PvlObject::findGroup(), Isis::PvlContainer::hasKeyword(), m_good, m_mapper, m_mappingGrp, m_maximumX, m_maximumY, m_minimumX, m_minimumY, m_sky, Isis::Null, Isis::PvlObject::Traverse, and Isis::IException::Unknown.

◆ ~Projection()

Isis::Projection::~Projection ( )

virtual

Destroys the Projection object.

References m_mapper.

Member Function Documentation

◆ GetX()

double Isis::Projection::GetX ( ) const

protected

Calculates the unrotated form of current x value.

Returns: double The unrotated x-value.

References Isis::PI.

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

◆ GetY()

double Isis::Projection::GetY ( ) const

protected

Calculates the unrotated form of the current y value.

Returns: double The unrotated y-value.

References Isis::PI.

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

◆ HasGroundRange()

bool Isis::Projection::HasGroundRange ( ) const

virtual

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 m_groundRangeGood.

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

◆ IsEquatorialCylindrical()

bool Isis::Projection::IsEquatorialCylindrical ( )

virtual

This method returns true if the projection is equatorial cylindrical.

In other words, if the projection is cylindrical and an image projected at 0 is the same as an image projected at 360.

Returns: bool true if the projection is equatorial cylindrical

Reimplemented in Isis::Equirectangular, Isis::Mercator, Isis::RingCylindrical, Isis::SimpleCylindrical, and Isis::TProjection.

Referenced by Isis::ShapeModelFactory::create().

◆ IsGood()

bool Isis::Projection::IsGood ( ) const

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 m_good.

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

◆ IsSky()

bool Isis::Projection::IsSky ( ) const

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

Returns: bool

References m_sky.

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

◆ LocalRadius()

virtual double Isis::Projection::LocalRadius ( ) const

pure virtual

Implemented in Isis::RingPlaneProjection, and Isis::TProjection.

◆ Mapping()

virtual PvlGroup Isis::Projection::Mapping ( )

pure virtual

◆ Name()

virtual QString Isis::Projection::Name ( ) const

pure virtual

This method returns the name of the map projection.

It is a pure virtual method (requires all subclasses to override).

Returns: string The name of the map projection.

Implemented in Isis::Equirectangular, Isis::LambertAzimuthalEqualArea, Isis::LambertConformal, Isis::LunarAzimuthalEqualArea, Isis::Mercator, Isis::Mollweide, Isis::ObliqueCylindrical, Isis::Orthographic, Isis::Planar, Isis::PointPerspective, Isis::PolarStereographic, Isis::RingCylindrical, Isis::Robinson, Isis::SimpleCylindrical, Isis::Sinusoidal, Isis::TransverseMercator, Isis::UpturnedEllipsoidTransverseAzimuthal, Isis::RingPlaneProjection, and Isis::TProjection.

Referenced by operator==().

◆ operator!=()

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

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::Projection::operator== ( const Projection & proj )

virtual

This method determines whether two map projection objects are equal by comparing the resolution, and 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 equivalent.

Reimplemented in Isis::ObliqueCylindrical, Isis::Equirectangular, Isis::LambertAzimuthalEqualArea, Isis::LambertConformal, Isis::Mercator, Isis::Mollweide, Isis::Orthographic, Isis::Planar, Isis::PointPerspective, Isis::PolarStereographic, Isis::RingCylindrical, Isis::RingPlaneProjection, Isis::Robinson, Isis::SimpleCylindrical, Isis::Sinusoidal, Isis::TProjection, Isis::TransverseMercator, and Isis::UpturnedEllipsoidTransverseAzimuthal.

References Name(), and Resolution().

◆ PixelResolution()

double Isis::Projection::PixelResolution ( ) const

protected

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

Returns: double pixel resolution in meters/pixel

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

◆ projectionType()

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

Returns an enum value for the projection type.

Returns: projection subclass type

Referenced by Isis::MosaicFindTool::getUserGroundPoint(), Isis::GridGraphicsItem::GridGraphicsItem(), Isis::UniversalGroundMap::GroundRange(), Isis::MosaicControlNetTool::mouseButtonRelease(), Isis::MosaicFindTool::mouseButtonRelease(), SetUnboundUniversalGround(), SetUniversalGround(), Isis::UniversalGroundMap::UniversalLatitude(), Isis::UniversalGroundMap::UniversalLongitude(), and Isis::MosaicAreaTool::userChangedBox().

◆ Resolution()

double Isis::Projection::Resolution ( ) const

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

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

◆ Rotation()

double Isis::Projection::Rotation ( ) const

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

Returns: double The rotation of the map.

◆ Scale()

virtual double Isis::Projection::Scale ( ) const

pure virtual

Implemented in Isis::RingPlaneProjection, and Isis::TProjection.

◆ SetComputedXY()

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

protected

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

◆ SetCoordinate()

virtual bool Isis::Projection::SetCoordinate	(	const double	x,
		const double	y )

pure virtual

◆ SetGround()

virtual bool Isis::Projection::SetGround	(	const double	lat,
		const double	lon )

pure virtual

◆ setProjectionType()

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

Sets the projection subclass type.

Parameters

ptype The projection subclass type

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

◆ SetUnboundUniversalGround()

bool Isis::Projection::SetUnboundUniversalGround	(	const double	coord1,
		const double	coord2 )

virtual

This method is used to set the lat/lon or radius/azimuth (i.e.

ring longitude) coordinate, depending on the projection type. 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 method will not adjust the longitude coordinate based on the longitude domain.

Parameters

coord1	Latitude (planetocentric) or ring radius to project
coord2	Longitude or ring longitude to project. The value passed in should be PositiveEast, Domain360.

Returns: bool Indicates whether the method was successful.

Reimplemented in Isis::TProjection.

References m_good, Isis::Null, projectionType(), Isis::TProjection::SetUnboundUniversalGround(), Isis::RingPlaneProjection::SetUniversalGround(), and Triaxial.

Referenced by Isis::UniversalGroundMap::SetUnboundGround().

◆ SetUniversalGround()

bool Isis::Projection::SetUniversalGround	(	const double	coord1,
		const double	coord2 )

virtual

This method is used to set the lat/lon or radius/azimuth (i.e.

ring longitude) coordinate, depending on the projection type. 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

coord1	Latitude (planetocentric) or ring radius to project
coord2	Longitude or ring longitude to project. The value passed in should be PositiveEast, Domain360.

Returns: bool Indicates whether the method was successful.

Reimplemented in Isis::TProjection, and Isis::RingPlaneProjection.

References m_good, Isis::Null, projectionType(), Isis::TProjection::SetUniversalGround(), Isis::RingPlaneProjection::SetUniversalGround(), and Triaxial.

Referenced by Isis::DemShape::localRadius(), Isis::UniversalGroundMap::SetGround(), Isis::UniversalGroundMap::SetGround(), Isis::Camera::SetRightAscensionDeclination(), and Isis::UniversalGroundMap::SetUniversalGround().

◆ SetUpperLeftCorner()

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

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

◆ SetWorld()

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

virtual

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

Referenced by Isis::ProcessExport::CreateWorldFile(), Isis::UniversalGroundMap::SetImage(), Isis::SubArea::UpdateLabel(), and Isis::PolygonTools::XYToLatLon().

◆ SetWorldMapper()

void Isis::Projection::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.

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 m_mapper.

◆ SetXY()

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

protected

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 m_good, and Isis::Null.

◆ ToDMS()

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

static

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 )

static

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 ToHours().

◆ ToHours()

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

static

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 ToHMS().

◆ ToProjectionX()

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

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_, m_mapper, Isis::Null, Isis::WorldMapper::ProjectionX(), and Isis::IException::Unknown.

◆ ToProjectionY()

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

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_, m_mapper, Isis::Null, Isis::WorldMapper::ProjectionY(), and Isis::IException::Unknown.

◆ ToWorldX()

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

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_, m_mapper, Isis::Null, Isis::IException::Unknown, and Isis::WorldMapper::WorldX().

◆ ToWorldY()

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

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_, m_mapper, Isis::Null, Isis::IException::Unknown, and Isis::WorldMapper::WorldY().

◆ Version()

virtual QString Isis::Projection::Version ( ) const

pure virtual

This method returns the Version of the map projection.

It is a pure virtual method (requires all subclasses to override).

Returns: string The Version number of the map projection.

Implemented in Isis::Equirectangular, Isis::LambertAzimuthalEqualArea, Isis::LambertConformal, Isis::LunarAzimuthalEqualArea, Isis::Mercator, Isis::Mollweide, Isis::ObliqueCylindrical, Isis::Orthographic, Isis::Planar, Isis::PointPerspective, Isis::PolarStereographic, Isis::RingCylindrical, Isis::Robinson, Isis::SimpleCylindrical, Isis::Sinusoidal, Isis::TransverseMercator, Isis::UpturnedEllipsoidTransverseAzimuthal, Isis::RingPlaneProjection, and Isis::TProjection.

◆ WorldX()

double Isis::Projection::WorldX ( ) const

virtual

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

Referenced by Isis::DemShape::localRadius(), Isis::UniversalGroundMap::Sample(), and Isis::Camera::SetRightAscensionDeclination().

◆ WorldY()

double Isis::Projection::WorldY ( ) const

virtual

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

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

◆ XCoord()

double Isis::Projection::XCoord ( ) const

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::MosaicFindTool::getUserGroundPoint(), Isis::PolygonTools::LatLonToXY(), Isis::RingPlaneProjection::SetCoordinate(), Isis::TProjection::SetCoordinate(), Isis::MosaicAreaTool::userChangedBox(), Isis::LambertConformal::XYRange(), Isis::PointPerspective::XYRange(), Isis::TProjection::XYRangeCheck(), and Isis::RingPlaneProjection::XYRangeCheck().

◆ XYRange()

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

pure virtual

Implemented in Isis::Equirectangular, Isis::LambertAzimuthalEqualArea, Isis::LambertConformal, Isis::LunarAzimuthalEqualArea, Isis::Mercator, Isis::Mollweide, Isis::ObliqueCylindrical, Isis::Orthographic, Isis::Planar, Isis::PointPerspective, Isis::PolarStereographic, Isis::RingCylindrical, Isis::RingPlaneProjection, Isis::Robinson, Isis::SimpleCylindrical, Isis::Sinusoidal, Isis::TProjection, Isis::TransverseMercator, and Isis::UpturnedEllipsoidTransverseAzimuthal.

◆ XYRangeCheck()

virtual void Isis::Projection::XYRangeCheck	(	const double	latitude,
		const double	longitude )

protectedpure virtual

Implemented in Isis::TProjection, and Isis::RingPlaneProjection.

◆ YCoord()

double Isis::Projection::YCoord ( ) const

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::MosaicFindTool::getUserGroundPoint(), Isis::PolygonTools::LatLonToXY(), Isis::RingPlaneProjection::SetCoordinate(), Isis::TProjection::SetCoordinate(), Isis::MosaicAreaTool::userChangedBox(), Isis::LambertConformal::XYRange(), Isis::PointPerspective::XYRange(), Isis::TProjection::XYRangeCheck(), and Isis::RingPlaneProjection::XYRangeCheck().

Member Data Documentation

◆ m_good

bool Isis::Projection::m_good

protected

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

◆ m_groundRangeGood

bool Isis::Projection::m_groundRangeGood

protected

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

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

◆ m_mapper

WorldMapper* Isis::Projection::m_mapper

protected

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

◆ m_mappingGrp

PvlGroup Isis::Projection::m_mappingGrp

protected

Mapping group that created this projection.

◆ m_maximumX

double Isis::Projection::m_maximumX

protected

See minimumX description.

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

◆ m_maximumY

double Isis::Projection::m_maximumY

protected

See minimumX description.

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

◆ m_minimumX

double Isis::Projection::m_minimumX

protected

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

◆ m_minimumY

double Isis::Projection::m_minimumY

protected

See minimumX description.

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

◆ m_sky

bool Isis::Projection::m_sky

protected

Indicates whether projection is sky or land.

Referenced by IsSky(), and Projection().

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

/Users/astamile/ISIS3/isis/src/base/objs/Projection/Projection.h
/Users/astamile/ISIS3/isis/src/base/objs/Projection/Projection.cpp

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ ProjectionType

Constructor & Destructor Documentation

◆ Projection()

◆ ~Projection()

Member Function Documentation

◆ GetX()

◆ GetY()

◆ HasGroundRange()

◆ IsEquatorialCylindrical()

◆ IsGood()

◆ IsSky()

◆ LocalRadius()

◆ Mapping()

◆ Name()

◆ operator!=()

◆ operator==()

◆ PixelResolution()

◆ projectionType()

◆ Resolution()

◆ Rotation()

◆ Scale()

◆ SetComputedXY()

◆ SetCoordinate()

◆ SetGround()

◆ setProjectionType()

◆ SetUnboundUniversalGround()

◆ SetUniversalGround()

◆ SetUpperLeftCorner()

◆ SetWorld()

◆ SetWorldMapper()

◆ SetXY()

◆ ToDMS()

◆ ToHMS()

◆ ToHours()

◆ ToProjectionX()

◆ ToProjectionY()

◆ ToWorldX()

◆ ToWorldY()

◆ Version()

◆ WorldX()

◆ WorldY()

◆ XCoord()

◆ XYRange()

◆ XYRangeCheck()

◆ YCoord()

Member Data Documentation

◆ m_good

◆ m_groundRangeGood

◆ m_mapper

◆ m_mappingGrp

◆ m_maximumX

◆ m_maximumY

◆ m_minimumX

◆ m_minimumY

◆ m_sky