Constants of the coordinate system library. More...

Typedefs
typedef double	AngularUnit
	Defines the angular unit. The value is the number of degrees per angular unit.

Enumerations
enum	AngularUnitType { kAngularUnitTypeDegree = 0, kAngularUnitTypeGeoInt, kAngularUnitTypeRadians, kAngularUnitTypeUndefined = -1 }
	Describes the angular unit type for the geographic coordinate system. More...

enum	AxisOrientation { kAxisOrientationUnknown = 0, kAxisOrientationNorth = 1, kAxisOrientationSouth = 2, kAxisOrientationEast = 3, kAxisOrientationWest = 4, kAxisOrientationUp = 5, kAxisOrientationDown = 6 }
	Describes the axis orientation. More...

enum	ProjectionParameterEnum { kProjPar_Azimuth = 0, kProjPar_LongitudeOfCenter = 1, kProjPar_LatitudeOfCenter = 2, kProjPar_ScaleFactor = 3, kProjPar_LatitudeOfOrigin = 4, kProjPar_LongitudeOfOrigin = 5, kProjPar_StandardParallel1 = 6, kProjPar_StandardParallel2 = 7, kProjPar_CoordinateUnit = 8, kProjPar_SemiMajorAxis = 9, kProjPar_SemiMinorAxis = 10, kProjPar_FalseEasting = 11, kProjPar_FalseNorthing = 12, kProjPar_UTMZone = 13, kProjPar_UTMIsNorth = 14, kProjPar_UTMAutoset = 15, kProjPar_LongitudeOfLocalScale = 16, kProjPar_LatitudeOfLocalScale = 17 }
	Parameters for the different projections. Required parameters for all projections: ProjPar_CoordinateUnit, ProjPar_SemiMajorAxis, ProjPar_SemiMinorAxis. More...

enum	ProjectionPropertyEnum { kProjProperty_LocalScale, kProjProperty_CorrespondedLocalScale }
	Defines the projection properties. More...

enum	ProjectionClassID { kProjectionClassID_Mercator = 0, kProjectionClassID_TransverseMercator, kProjectionClassID_LambertConformalConic, kProjectionClassID_Geo, kProjectionClassID_Gnomonic, kProjectionClassID_Stereographic, kProjectionClassID_PolarStereographic = kProjectionClassID_Stereographic, kProjectionClassID_LocalCartesian, kProjectionClassID_UTM }
	Projection classes. More...

Variables
SDK_CRS_BEGIN_NAMESPACE typedef double	LinearUnit
	Defines the linear unit. The value is the number of meters per linear unit.

#define	kRADIUS 6378137.0L
	Equatorial radius of the Earth in meters.

#define	kEQUATOR 40075016.6855784861L
	Length of the Equator in meters.

#define	kWGS84_NAME "WGS84"
	WGS84 definition of Earth.

#define	kWGS84_E 0.08181919084262150L
	First eccentricity.

#define	kWGS84_ESQUARED kWGS84_E2
	First eccentricity squared = e2 = 1-(b/a)2 = (2-f)f.

#define	kWGS84_INVERSE_FLATTENING 298.257223563L
	Inverse flattening.

#define	kWGS84_SEMIMAJOR 6378137.0L
	Semi-major axis in meters.

#define	kWGS84_SEMIMINOR (kWGS84_SEMIMAJOR*(1-(1/kWGS84_INVERSE_FLATTENING)))
	Semi-minor axis in meters.

Detailed Description

Constants of the coordinate system library.

Enumeration Type Documentation

◆ AngularUnitType

enum AngularUnitType

Describes the angular unit type for the geographic coordinate system.

Enumerator
kAngularUnitTypeDegree	Degree.
kAngularUnitTypeGeoInt	GeoInt.
kAngularUnitTypeRadians	Radians.
kAngularUnitTypeUndefined	Not applicable (Cartesian)

◆ AxisOrientation

enum AxisOrientation

Describes the axis orientation.

Enumerator
kAxisOrientationUnknown	Unknown or unspecified axis orientation. This can be used for local or fitted coordinate systems.
kAxisOrientationNorth	Increasing ordinates values go North. This is usually used for Grid Y coordinates and Latitude.
kAxisOrientationSouth	Increasing ordinates values go South. This is rarely used.
kAxisOrientationEast	Increasing ordinates values go East. This is rarely used.
kAxisOrientationWest	Increasing ordinates values go West. This is usually used for Grid X coordinates and Longitude.
kAxisOrientationUp	Increasing ordinates values go up. This is used for vertical coordinate systems.
kAxisOrientationDown	Increasing ordinates values go down. This is used for vertical coordinate systems.

◆ ProjectionParameterEnum

enum ProjectionParameterEnum

Parameters for the different projections. Required parameters for all projections: ProjPar_CoordinateUnit, ProjPar_SemiMajorAxis, ProjPar_SemiMinorAxis.

Mercator Projection.

The Mercator projection is a cylindrical, conformal map projection in which meridians and parallels are straight lines that cross at 90-degree angles. Angular relationships are preserved. It is quite useful for navigation because rhumb lines (loxodromes), which show constant direction, are straight.

Parameters: ProjPar_LongitudeOfCenter, ProjPar_LatitudeOfCenter, ProjPar_LatitudeOfOrigin, ProjPar_ScaleFactor, ProjPar_FalseEasting, ProjPar_FalseNorthing

Transverse Mercator Projection

The Transverse Mercator projection is similar to the Mercator Projection, except that the axis of the projection cylinder is rotated 90 degrees from the polar axis. This projection does not have the straight meridians and straight parallels of the Mercator projection, except for the central meridian, the two meridians 90 degrees away, and the equator. Nor does the Transverse Mercator projection have the straight rhumb lines of the Mercator projection; rather, it is a conformal projection. Scale is true along the central meridian or along two straight lines equidistant from and parallel to the central meridian.

Parameters. ProjPar_LongitudeOfCenter, ProjPar_LatitudeOfCenter, ProjPar_LatitudeOfOrigin, ProjPar_ScaleFactor, ProjPar_FalseEasting, ProjPar_FalseNorthing

Universal Transverse Mercator Projection.

The Universal Transverse Mercator (UTM) projection class is an extension of the Transverse Mercator projection class that allows all UTM zones in a given horizontal datum.

Parameters. ProjPar_CentralMeridian, ProjPar_LatitudeOfOrigin, ProjPar_ScaleFactor, ProjPar_FalseEasting, ProjPar_FalseNorthing

Optional parameters. ProjPar_UTMZone, ProjPar_UTMIsNorth, ProjPar_UTMAutoset

Lambert Conformal Conic (2-parallel) Projection.

The Lambert Conformal Conic (2-parallel) projection is a map projection in which the scale is true along two standard parallels, and the true shape of small areas is preserved. Parallels are unequally spaced arcs of concentric circles spaced closer to each other near the center of the map. The meridians are equally spaced and intersect the parallels at right angles. The scale is true along two standard parallels.

The Lambert Conformal Conic projection is widely used in atlases, in aeronautical charts, and in plane coordinate systems in surveying.

Parameters. ProjPar_CentralMeridian, ProjPar_LatitudeOfOrigin, ProjPar_StandardParallel1, ProjPar_StandardParallel2, ProjPar_FalseEasting, ProjPar_FalseNorthing.

Enumerator
kProjPar_Azimuth	Azimuth of the Center Line.
kProjPar_LongitudeOfCenter	Longitude of the Center of the Projection.
kProjPar_LatitudeOfCenter	Latitude of the Center of the Projection.
kProjPar_ScaleFactor	Scale Reduction Factor at the Center of the Projection.
kProjPar_LatitudeOfOrigin	Latitude of the Origin of the Projection.
kProjPar_LongitudeOfOrigin	Longitude of the Origin of the Projection.
kProjPar_StandardParallel1	Latitude of Pseudo Standard Parallel1. Latitude of Southern Standard Parallel for Lambert Conformal Conic (2-parallel) Projection.
kProjPar_StandardParallel2	Latitude of Pseudo Standard Parallel2. Latitude of Northern Standard Parallel for Lambert Conformal Conic (2-parallel) Projection.
kProjPar_CoordinateUnit	Linear units of coordinates in meters per unit.
kProjPar_SemiMajorAxis	Semi-major axis of an ellipsoid.
kProjPar_SemiMinorAxis	Semi-minor axis of an ellipsoid.
kProjPar_FalseEasting	False easting.
kProjPar_FalseNorthing	False northing.
kProjPar_UTMZone	UTM Zone.
kProjPar_UTMIsNorth	UTM. Currently in northern hemisphere.
kProjPar_UTMAutoset	UTM. Automatically set zone.
kProjPar_LongitudeOfLocalScale	Longitude of position for getting a local scale.
kProjPar_LatitudeOfLocalScale	Latitude of position for getting a local scale.

◆ ProjectionPropertyEnum

enum ProjectionPropertyEnum

Defines the projection properties.

Enumerator
kProjProperty_LocalScale	Returns a local scale at the position specified by kProjPar_LongitudeOfLocalScale and kProjPar_LatitudeOfLocalScale parameters.
kProjProperty_CorrespondedLocalScale	Returns a corresponded local scale

◆ ProjectionClassID

enum ProjectionClassID

Projection classes.

Enumerator
kProjectionClassID_Mercator	Mercator.
kProjectionClassID_TransverseMercator	Transverse Mercator.
kProjectionClassID_LambertConformalConic	Lambert Conformal Conic.
kProjectionClassID_Geo	Geographic.
kProjectionClassID_Gnomonic	Spherical gnomonic.
kProjectionClassID_Stereographic	Stereographic.
kProjectionClassID_PolarStereographic	Polar Stereographic alias Stereographic.
kProjectionClassID_LocalCartesian	Local Cartesian.
kProjectionClassID_UTM	UTM.

Typedefs

Enumerations