Isis Developer Reference
Isis::LunarAzimuthalEqualArea Class Reference

Modified Lambert Azimuthal Equal-Area Map Projection. More...

#include <LunarAzimuthalEqualArea.h>

Inheritance diagram for Isis::LunarAzimuthalEqualArea:
Inheritance graph
Collaboration diagram for Isis::LunarAzimuthalEqualArea:
Collaboration graph

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

 LunarAzimuthalEqualArea (Pvl &label)
 Constructs a LunarAzimuthalEqualArea object.
 
 ~LunarAzimuthalEqualArea ()
 Destroys the LunarAzimuthalEqualArea object.
 
bool operator== (const TProjection &proj)
 Compares two Projection objects to see if they are equal.
 
QString Name () const
 Returns the name of the map projection, "LunarAzimuthalEqualArea".
 
QString Version () const
 Returns the version of the map projection.
 
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.
 
bool SetCoordinate (const double x, const double y)
 This method is used to set the projection x/y.
 
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.
 
PvlGroup Mapping ()
 This function returns the keywords that this projection uses.
 
virtual bool operator== (const Projection &proj)
 This method determines whether two map projection objects are equal by comparing the equatorial radius, polar radius, latitude type, longitude direction, resolution, and projection name.
 
double EquatorialRadius () const
 This returns the equatorial radius of the target.
 
double PolarRadius () const
 This returns the polar radius of the target.
 
double Eccentricity () const
 This returns the eccentricity of the target,.
 
double LocalRadius (double lat) const
 This method returns the local radius in meters at the specified latitude position.
 
double LocalRadius () const
 This method returns the local radius in meters at the current latitude position.
 
virtual double TrueScaleLatitude () const
 This method returns the latitude of true scale.
 
virtual bool IsEquatorialCylindrical ()
 This method returns true if the projection is equatorial cylindrical.
 
bool IsPlanetocentric () const
 This indicates if the latitude type is planetocentric (as opposed to planetographic).
 
bool IsPlanetographic () const
 This indicates if the latitude type is planetographic (as opposed to planetocentric).
 
QString LatitudeTypeString () const
 This method returns the latitude type as a string.
 
double ToPlanetocentric (const double lat) const
 This method converts a planetographic latitude to a planetocentric latitude.
 
double ToPlanetographic (const double lat) const
 This method converts a planetocentric latitude to a planetographic latitude.
 
bool IsPositiveEast () const
 This indicates if the longitude direction type is positive west (as opposed to postive east).
 
bool IsPositiveWest () const
 This indicates if the longitude direction type is positive east (as opposed to postive west).
 
QString LongitudeDirectionString () const
 This method returns the longitude direction as a string.
 
bool Has180Domain () const
 This indicates if the longitude domain is -180 to 180 (as opposed to 0 to 360).
 
bool Has360Domain () const
 This indicates if the longitude domain is 0 to 360 (as opposed to -180 to 180).
 
QString LongitudeDomainString () const
 This method returns the longitude domain as a string.
 
virtual double MinimumLatitude () const
 This returns the minimum latitude of the area of interest.
 
virtual double MaximumLatitude () const
 This returns the maximum latitude of the area of interest.
 
virtual double MinimumLongitude () const
 This returns the minimum longitude of the area of interest.
 
virtual double MaximumLongitude () const
 This returns the maximum longitude of the area of interest.
 
virtual double Latitude () const
 This returns a latitude with correct latitude type as specified in the label object.
 
virtual double Longitude () const
 This returns a longitude with correct longitude direction and domain as specified in the label object.
 
virtual 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).
 
bool SetUnboundUniversalGround (const double coord1, const double coord2)
 This method is used to set the latitude/longitude.
 
virtual double UniversalLatitude ()
 This returns a universal latitude (planetocentric).
 
virtual double UniversalLongitude ()
 This returns a universal longitude (positive east in 0 to 360 domain).
 
double Scale () const
 This method returns the scale for mapping world coordinates into projection coordinates.
 
virtual PvlGroup MappingLatitudes ()
 This function returns the latitude keywords that this projection uses.
 
virtual PvlGroup MappingLongitudes ()
 This function returns the longitude keywords that this projection uses.
 
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 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.
 
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 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.
 
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).
 

Static Public Member Functions

static double ToPlanetocentric (double lat, double eRadius, double pRadius)
 This method converts a planetographic latitude to a planetocentric latitude.
 
static double ToPlanetographic (double lat, double eRadius, double pRadius)
 This method converts a planetocentric latitude to a planetographic latitude.
 
static double ToPositiveEast (const double lon, const int domain)
 This method converts a longitude into the positive east direction.
 
static double ToPositiveWest (const double lon, const int domain)
 This method converts a longitude into the positive west direction.
 
static double To180Domain (const double lon)
 This method converts a longitude into the -180 to 180 domain.
 
static double To360Domain (const double lon)
 This method converts a longitude into the 0 to 360 domain.
 
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

void XYRangeCheck (const double latitude, const double longitude)
 This convience function is established to assist in the development of the XYRange virtual method.
 
bool inLongitudeRange (double longitude)
 Determine whether the given longitude is within the range of the MinimumLongitude and MaximumLongitude range of this projection.
 
bool inLongitudeRange (double minLon, double maxLon, double longitude)
 Determine whether the given longitude is within the range of the given min and max longitudes.
 
bool inLatitudeRange (double latitude)
 Determine whether the given latitude is within the range of the MinimumLatitude and MaximumLatitude range of this projection.
 
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.
 
double qCompute (const double sinPhi) const
 A convience method to compute Snyder's q equation (3-12) for a given latitude, \(\phi\).
 
double phi2Compute (const double t) const
 A convience method to compute latitude angle phi2 given small t, from Syder's recursive equation (7-9)
 
double mCompute (const double sinphi, const double cosphi) const
 A convience method to compute Snyder's m equation (14-15) for a given latitude, \(\phi\).
 
double tCompute (const double phi, const double sinphi) const
 A convience method to compute Snyder's t equation (15-9) for a given latitude, \(\phi\).
 
double e4Compute () const
 A convience method to compute.
 
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

double m_latitude
 This contains the currently set latitude value.
 
double m_longitude
 This contains the currently set longitude value.
 
LatitudeType m_latitudeType
 An enumerated type indicating the LatitudeType read from the labels.
 
LongitudeDirection m_longitudeDirection
 An enumerated type indicating the LongitudeDirection read from the labels.
 
int m_longitudeDomain
 This integer is either 180 or 360 and is read from the labels.
 
double m_equatorialRadius
 Polar radius of the target.
 
double m_polarRadius
 Polar radius of the target.
 
double m_eccentricity
 The eccentricity of the target body.
 
double m_minimumLatitude
 Contains the minimum latitude for the entire ground range.
 
double m_maximumLatitude
 Contains the maximum latitude for the entire ground range.
 
double m_minimumLongitude
 Contains the minimum longitude for the entire ground range.
 
double m_maximumLongitude
 Contains the maximum longitude for the entire ground range.
 
WorldMapperm_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

Modified Lambert Azimuthal Equal-Area Map Projection.

This class provides methods for the forward and inverse equations of a Lunar Azimuthal Equal-Area map projection.

The code was converted to C++ from the Fortran version of Isis2. 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
2009-05-15 Eric Hyer

Member Enumeration Documentation

◆ LatitudeType

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

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

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

◆ LunarAzimuthalEqualArea()

Isis::LunarAzimuthalEqualArea::LunarAzimuthalEqualArea ( Pvl & label)

Constructs a LunarAzimuthalEqualArea object.

Parameters
labelThis argument must be a Label containing the proper mapping information as indicated in the Projection class. Additionally, the LunarAzimuthalEqualArea projection requires the center longitude to be defined in the keyword CenterLongitude.
Exceptions
IException::Unknown- "Invalid label group [Mapping]";

References _FILEINFO_, Isis::PvlObject::findGroup(), Isis::PI, Isis::PvlObject::Traverse, and Isis::IException::Unknown.

◆ ~LunarAzimuthalEqualArea()

Isis::LunarAzimuthalEqualArea::~LunarAzimuthalEqualArea ( )

Destroys the LunarAzimuthalEqualArea 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(), Isis::Mercator::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::TProjection::operator==().

◆ GetX()

◆ GetY()

◆ 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.

◆ 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.

◆ HasGroundRange()

bool Isis::Projection::HasGroundRange ( ) const
virtualinherited

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
lonLongitude 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
lonLongitude 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::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().

◆ 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
latitudeThe 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
longitudeThe longitude to check.
Returns
bool Indicates whether MinimumLongitude <= longitude <= MaximumLongitude.

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

Referenced by Isis::TProjection::inLongitudeRange().

◆ 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
minLonThe lower end of longitude range.
maxLonThe upper end of longitude range.
longitudeThe longitude to check.
Returns
bool Indicates whether minLon <= longitude <= maxLon.

References Isis::TProjection::To360Domain().

◆ IsEquatorialCylindrical()

bool Isis::TProjection::IsEquatorialCylindrical ( )
virtualinherited

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 from Isis::Projection.

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

◆ 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::TProjection::XYRangeCheck(), and Isis::RingPlaneProjection::XYRangeCheck().

◆ IsPlanetocentric()

◆ 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.

◆ 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.

◆ 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(), Isis::Camera::SetImage(), and Isis::Camera::SetRightAscensionDeclination().

◆ Latitude()

double Isis::TProjection::Latitude ( ) const
virtualinherited

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::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.

◆ LocalRadius() [1/2]

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::LocalRadius(), and Isis::TProjection::m_latitude.

Referenced by Isis::Equirectangular::Equirectangular(), and Isis::TProjection::LocalRadius().

◆ LocalRadius() [2/2]

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
latitudeA 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.

◆ Longitude()

double Isis::TProjection::Longitude ( ) const
virtualinherited

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::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.

◆ Mapping()

PvlGroup Isis::LunarAzimuthalEqualArea::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()

◆ MappingLongitudes()

◆ MaximumLatitude()

double Isis::TProjection::MaximumLatitude ( ) const
virtualinherited

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(), and Isis::TProjection::xyRangeOblique().

◆ MaximumLongitude()

double Isis::TProjection::MaximumLongitude ( ) const
virtualinherited

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::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
sinphisine of phi
cosphicosine 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
virtualinherited

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(), and Isis::TProjection::xyRangeOblique().

◆ MinimumLongitude()

double Isis::TProjection::MinimumLongitude ( ) const
virtualinherited

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::Orthographic::XYRange(), and Isis::TProjection::xyRangeOblique().

◆ Name()

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

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

Returns
QString Name of projection, "LunarAzimuthalEqualArea"

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
projA reference to a Projection object to which this Projection will be compared.
Returns
bool Indicates whether the Projection objects are not equivalent.

◆ operator==() [1/2]

bool Isis::TProjection::operator== ( const Projection & proj)
virtualinherited

This method determines whether two map projection objects are equal by comparing the equatorial radius, polar radius, latitude type, longitude direction, resolution, and projection name.

Parameters
projA reference to a TProjection object to which this TProjection will be compared.
Returns
bool Indicates whether the TProjection objects are equivalent.

Reimplemented from Isis::Projection.

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

References Isis::TProjection::EquatorialRadius(), Isis::TProjection::IsPlanetocentric(), Isis::TProjection::IsPositiveWest(), and Isis::TProjection::PolarRadius().

◆ operator==() [2/2]

bool Isis::LunarAzimuthalEqualArea::operator== ( const TProjection & proj)

Compares two Projection objects to see if they are equal.

Parameters
projProjection object to do comparison on
Returns
bool Returns true if the Projection objects are equal, and false if they are not

◆ 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
tsmall 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 Isis::LambertConformal::SetCoordinate(), Isis::Mercator::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::Planar::XYRange(), and Isis::RingCylindrical::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::TProjection::operator==().

◆ projectionType()

◆ 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
sinPhiThe 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::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

◆ SetCoordinate()

bool Isis::LunarAzimuthalEqualArea::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
xX coordinate of the projection in units that are the same as the radii in the label
yY coordinate of the projection in units that are the same as the radii in the label
Returns
bool

Reimplemented from Isis::TProjection.

References Isis::E, EPSILON, Isis::HALFPI, Isis::TProjection::IsPlanetocentric(), Isis::TProjection::m_equatorialRadius, Isis::Projection::m_good, Isis::TProjection::m_latitude, Isis::TProjection::m_longitude, Isis::PI, Isis::Projection::SetXY(), and Isis::TProjection::ToPlanetocentric().

◆ SetGround()

bool Isis::LunarAzimuthalEqualArea::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
latLatitude value to project
lonLongitude value to project
Returns
bool

Reimplemented from Isis::TProjection.

References Isis::E, 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::PI, Isis::TProjection::PositiveWest, Isis::Projection::SetComputedXY(), and Isis::TProjection::ToPlanetographic().

◆ setProjectionType()

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

Sets the projection subclass type.

Parameters
ptypeThe 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
latPlanetocentric Latitude value to project
lonPositiveEast, 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
latPlanetocentric Latitude value to project
lonPositiveEast, 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::Projection::SetUniversalGround().

◆ SetUpperLeftCorner()

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

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
minBorderMinimum latitude or longitude to search between.
maxBorderMaximum latitude or longitude to search between.
extremeValThe resulting global coordinate value (min or max value for x or y, depending on findMin and searchX) on the constBorder.
constBorderThe latitude or longitude that remains constant. The method will step along this border.
searchXIndicates whether the method is searching for a min or max x-coordinate. If false the method searches for min or max y-coordinate.
searchLongitudeIndicates 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).
findMinIndicates 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
minBorderMinimum latitude or longitude to search between. This value gets updated to a more precise range.
maxBorderMaximum latitude or longitude to search between. This value gets updated to a more precise range.
minBorderXThe x-value corresponding to the lower resultant minBorder and the constBorder, which is more accurate when nearly equal to maxBorderX.
minBorderYThe y-value corresponding to the lower resultant minBorder and the constBorder, which is more accurate when nearly equal to maxBorderY.
maxBorderXThe x-value corresponding to the higher resultant maxBorder and the constBorder, which is more accurate when nearly equal to minBorderX.
maxBorderYThe y-value corresponding to the higher resultant maxBorder and the constBorder, which is more accurate when nearly equal to minBorderY.
constBorderThe latitude or longitude that remains constant. The method will step along this border.
searchXIndicates whether the method is searching for a min or max x-coordinate. If false the method searches for min or max y-coordinate.
searchLongitudeIndicates 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).
findMinIndicates 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
variableBorderThe latitude or longitude that is variable in the search methods.
constBorderThe latitude or longitude that is constant in the search methods.
variableIsLatIndicates 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
xthe upper left corner x value
ythe upper left corner y value

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

◆ SetWorld()

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

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
worldXWorld X coordinate in units that are specified by the WorldMapper object (e.g., pixels, millimeters, etc)
worldYWorld 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::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
mapperPointer to the mapper

References Isis::Projection::m_mapper.

◆ SetXY()

◆ 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
phiphi
sinphisin 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(), Isis::LambertConformal::SetGround(), Isis::Mercator::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
lonLongitude 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::Orthographic::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::TProjection::SetUniversalGround(), Isis::TProjection::ToPositiveEast(), Isis::TProjection::ToPositiveWest(), and Isis::ProcessImportPds::TranslatePdsProjection().

◆ To360Domain()

◆ 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
angleAngle 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
angleAngle 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
angleAngle 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
latPlanetographic latitude to convert.
See also
ToPlanetocentric(lat, eRadius, pRadius)
Returns
double The latitude, converted to planetocentric.

References Isis::TProjection::m_equatorialRadius, Isis::TProjection::m_polarRadius, and Isis::TProjection::ToPlanetocentric().

Referenced by Isis::LambertConformal::SetCoordinate(), SetCoordinate(), Isis::Mercator::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::TProjection::ToPlanetocentric(), 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
latPlanetographic latitude to convert.
eRadiusEquatorial radius.
pRadiusPolar 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]

◆ 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
latPlanetocentric latitude to convert.
eRadiusEquatorial radius.
pRadiusPolar 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
lonLongitude to convert into the positive east direction.
domainMust 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
lonLongitude to convert into the positive west direction.
domainMust 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.

◆ 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
worldXWorld 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.

◆ 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
worldYWorld 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.

◆ 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
projectionXProjection 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().

◆ 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
projectionYProjection 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().

◆ TrueScaleLatitude()

double Isis::TProjection::TrueScaleLatitude ( ) const
virtualinherited

This method returns the latitude of true scale.

It is a virtual function and if it is not overriden the default latitude of true scale is 0 (at the equator). Otherwise it is projection specific. For example, the center latitude for Mercator, Equidistant, or a parallel for conic projections. This method is used by the Scale routine to ensure the local radius is used in the computation.

Returns
double The latitude where the projection is not distorted.

Reimplemented in Isis::Equirectangular, Isis::LambertAzimuthalEqualArea, Isis::LambertConformal, Isis::Mercator, Isis::Orthographic, Isis::PointPerspective, and Isis::PolarStereographic.

Referenced by Isis::TProjection::Scale().

◆ UniversalLatitude()

double Isis::TProjection::UniversalLatitude ( )
virtualinherited

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().

◆ UniversalLongitude()

double Isis::TProjection::UniversalLongitude ( )
virtualinherited

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().

◆ Version()

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

Returns the version of the map projection.

Returns
QString Version number

Implements Isis::TProjection.

◆ WorldX()

double Isis::Projection::WorldX ( ) const
virtualinherited

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

◆ WorldY()

double Isis::Projection::WorldY ( ) const
virtualinherited

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::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::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()

bool Isis::LunarAzimuthalEqualArea::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
minXMinimum x projection coordinate which covers the latitude longitude range specified in the labels.
maxXMaximum x projection coordinate which covers the latitude longitude range specified in the labels.
minYMinimum y projection coordinate which covers the latitude longitude range specified in the labels.
maxYMaximum 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
// In case the latitude crosses the equator, check there
if (inLatitudeRange(0.0)) {
}
// 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;
}
double m_maximumX
See minimumX description.
Definition Projection.h:326
double m_minimumX
The data elements m_minimumX, m_minimumY, m_maximumX, and m_maximumY are convience data elements when...
Definition Projection.h:317
double m_minimumY
See minimumX description.
Definition Projection.h:327
double m_maximumY
See minimumX description.
Definition Projection.h:328
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...
Definition Sinusoidal.cpp:214
double m_minimumLatitude
Contains the minimum latitude for the entire ground range.
Definition TProjection.h:354
double m_maximumLongitude
Contains the maximum longitude for the entire ground range.
Definition TProjection.h:360
void XYRangeCheck(const double latitude, const double longitude)
This convience function is established to assist in the development of the XYRange virtual method.
Definition TProjection.cpp:1062
bool inLatitudeRange(double latitude)
Determine whether the given latitude is within the range of the MinimumLatitude and MaximumLatitude r...
Definition TProjection.cpp:1160
double m_minimumLongitude
Contains the minimum longitude for the entire ground range.
Definition TProjection.h:358
double m_maximumLatitude
Contains the maximum latitude for the entire ground range.
Definition TProjection.h:356

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
latitudeTest for min/max projection coordinates at this latitude
longitudeTest 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::Equirectangular::XYRange(), Isis::LambertConformal::XYRange(), XYRange(), Isis::Mercator::XYRange(), Isis::Orthographic::XYRange(), Isis::PolarStereographic::XYRange(), Isis::Robinson::XYRange(), Isis::SimpleCylindrical::XYRange(), Isis::Sinusoidal::XYRange(), and Isis::TransverseMercator::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
minXMinimum x projection coordinate which covers the latitude longitude range specified in the labels.
maxXMaximum x projection coordinate which covers the latitude longitude range specified in the labels.
minYMinimum y projection coordinate which covers the latitude longitude range specified in the labels.
maxYMaximum 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::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_eccentricity

double Isis::TProjection::m_eccentricity
protectedinherited

◆ 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.

Referenced by Isis::TProjection::EquatorialRadius(), Isis::LambertConformal::LambertConformal(), Isis::TProjection::LocalRadius(), Isis::PointPerspective::PointPerspective(), Isis::TProjection::Scale(), Isis::LambertConformal::SetCoordinate(), SetCoordinate(), Isis::Mercator::SetCoordinate(), Isis::ObliqueCylindrical::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Robinson::SetCoordinate(), Isis::SimpleCylindrical::SetCoordinate(), Isis::Sinusoidal::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::LambertConformal::SetGround(), SetGround(), Isis::Mercator::SetGround(), Isis::ObliqueCylindrical::SetGround(), Isis::Orthographic::SetGround(), Isis::PointPerspective::SetGround(), Isis::PolarStereographic::SetGround(), Isis::Robinson::SetGround(), Isis::SimpleCylindrical::SetGround(), Isis::Sinusoidal::SetGround(), Isis::TransverseMercator::SetGround(), Isis::TProjection::ToPlanetocentric(), Isis::TProjection::ToPlanetographic(), Isis::TProjection::TProjection(), Isis::TransverseMercator::TransverseMercator(), Isis::Orthographic::XYRange(), and Isis::PointPerspective::XYRange().

◆ m_good

bool Isis::Projection::m_good
protectedinherited

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

Referenced by Isis::Projection::IsGood(), Isis::Projection::Projection(), Isis::Projection::SetComputedXY(), Isis::Equirectangular::SetCoordinate(), Isis::LambertConformal::SetCoordinate(), SetCoordinate(), Isis::Mercator::SetCoordinate(), Isis::ObliqueCylindrical::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::Planar::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::RingCylindrical::SetCoordinate(), Isis::RingPlaneProjection::SetCoordinate(), Isis::Robinson::SetCoordinate(), Isis::SimpleCylindrical::SetCoordinate(), Isis::Sinusoidal::SetCoordinate(), Isis::TProjection::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::Equirectangular::SetGround(), Isis::LambertConformal::SetGround(), SetGround(), Isis::Mercator::SetGround(), Isis::ObliqueCylindrical::SetGround(), Isis::Orthographic::SetGround(), Isis::PointPerspective::SetGround(), Isis::PolarStereographic::SetGround(), Isis::Robinson::SetGround(), Isis::SimpleCylindrical::SetGround(), Isis::Sinusoidal::SetGround(), Isis::TProjection::SetGround(), Isis::TransverseMercator::SetGround(), Isis::Planar::SetGround(), Isis::RingCylindrical::SetGround(), Isis::RingPlaneProjection::SetGround(), Isis::Projection::SetUnboundUniversalGround(), Isis::TProjection::SetUnboundUniversalGround(), Isis::Projection::SetUniversalGround(), Isis::TProjection::SetUniversalGround(), Isis::RingPlaneProjection::SetUniversalGround(), Isis::Projection::SetXY(), Isis::LambertConformal::XYRange(), Isis::TProjection::XYRangeCheck(), and Isis::RingPlaneProjection::XYRangeCheck().

◆ m_groundRangeGood

bool Isis::Projection::m_groundRangeGood
protectedinherited

◆ m_latitude

◆ m_latitudeType

LatitudeType Isis::TProjection::m_latitudeType
protectedinherited

◆ m_longitude

◆ 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.

Referenced by Isis::Equirectangular::Equirectangular(), Isis::TProjection::IsPositiveEast(), Isis::TProjection::IsPositiveWest(), Isis::LambertConformal::LambertConformal(), Isis::TProjection::LongitudeDirectionString(), Isis::Mercator::Mercator(), Isis::Mollweide::Mollweide(), Isis::Orthographic::Orthographic(), Isis::PointPerspective::PointPerspective(), Isis::PolarStereographic::PolarStereographic(), Isis::Robinson::Robinson(), Isis::Equirectangular::SetCoordinate(), Isis::LambertConformal::SetCoordinate(), Isis::Mercator::SetCoordinate(), Isis::ObliqueCylindrical::SetCoordinate(), Isis::Orthographic::SetCoordinate(), Isis::PointPerspective::SetCoordinate(), Isis::PolarStereographic::SetCoordinate(), Isis::Robinson::SetCoordinate(), Isis::SimpleCylindrical::SetCoordinate(), Isis::Sinusoidal::SetCoordinate(), Isis::TransverseMercator::SetCoordinate(), Isis::Equirectangular::SetGround(), Isis::LambertConformal::SetGround(), SetGround(), Isis::Mercator::SetGround(), Isis::ObliqueCylindrical::SetGround(), Isis::Orthographic::SetGround(), Isis::PointPerspective::SetGround(), Isis::PolarStereographic::SetGround(), Isis::Robinson::SetGround(), Isis::SimpleCylindrical::SetGround(), Isis::Sinusoidal::SetGround(), Isis::TransverseMercator::SetGround(), Isis::TProjection::SetUnboundUniversalGround(), Isis::TProjection::SetUniversalGround(), Isis::SimpleCylindrical::SimpleCylindrical(), Isis::Sinusoidal::Sinusoidal(), Isis::TProjection::TProjection(), Isis::TransverseMercator::TransverseMercator(), Isis::TProjection::UniversalLongitude(), Isis::LambertConformal::XYRange(), and Isis::PolarStereographic::XYRange().

◆ m_longitudeDomain

int Isis::TProjection::m_longitudeDomain
protectedinherited

◆ 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.

Referenced by Isis::Equirectangular::Mapping(), Isis::LambertConformal::Mapping(), Mapping(), Isis::Mercator::Mapping(), Isis::ObliqueCylindrical::Mapping(), Isis::Orthographic::Mapping(), Isis::PointPerspective::Mapping(), Isis::PolarStereographic::Mapping(), Isis::RingPlaneProjection::Mapping(), Isis::Robinson::Mapping(), Isis::SimpleCylindrical::Mapping(), Isis::Sinusoidal::Mapping(), Isis::TProjection::Mapping(), Isis::TransverseMercator::Mapping(), Isis::Equirectangular::MappingLatitudes(), Isis::LambertConformal::MappingLatitudes(), Isis::Mercator::MappingLatitudes(), Isis::Orthographic::MappingLatitudes(), Isis::PointPerspective::MappingLatitudes(), Isis::PolarStereographic::MappingLatitudes(), Isis::TProjection::MappingLatitudes(), Isis::TransverseMercator::MappingLatitudes(), Isis::Equirectangular::MappingLongitudes(), Isis::LambertConformal::MappingLongitudes(), Isis::Mercator::MappingLongitudes(), Isis::Orthographic::MappingLongitudes(), Isis::PointPerspective::MappingLongitudes(), Isis::PolarStereographic::MappingLongitudes(), Isis::Robinson::MappingLongitudes(), Isis::SimpleCylindrical::MappingLongitudes(), Isis::Sinusoidal::MappingLongitudes(), Isis::TProjection::MappingLongitudes(), Isis::TransverseMercator::MappingLongitudes(), Isis::Planar::MappingRingLongitudes(), Isis::RingCylindrical::MappingRingLongitudes(), Isis::RingPlaneProjection::MappingRingLongitudes(), Isis::Planar::MappingRingRadii(), Isis::RingCylindrical::MappingRingRadii(), Isis::RingPlaneProjection::MappingRingRadii(), Isis::Projection::Projection(), Isis::RingPlaneProjection::RingPlaneProjection(), Isis::Projection::SetUpperLeftCorner(), and Isis::TProjection::TProjection().

◆ m_maximumLatitude

◆ m_maximumLongitude

◆ m_maximumX

◆ m_maximumY

◆ m_minimumLatitude

◆ m_minimumLongitude

◆ 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::Equirectangular::XYRange(), Isis::LambertConformal::XYRange(), 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

◆ 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: