Crs.UnprojectToGeocentricXYZ Method
Low-level method converting Easting, Northing, Height directly to geocentric X, Y, Z.
UnprojectToGeocentricXYZ(Point projectedPoint)
Low-level method converting Easting, Northing, Height directly to geocentric X, Y, Z.Syntax
public Point UnprojectToGeocentricXYZ (
Point projectedPoint
)Parameters
A point expressed in Easting, Northing, Height.
Return Value
The same point in geocentric Cartesian X, Y, Z coordinates, in meters.
Remarks
This is a low-level method. Its input is a point expressed in projected coordinates where x is Easting and y is Northing in the length unit of the projection, or longitude and latitude in degrees if the projection is LongLat, while z is height in meters above the reference Ellipsoid. The method returns the same point in geocentric Cartesian coordinates in meters, usually written X, Y, and Z, where the origin is the center of the reference Ellipsoid. The positive Z axis goes through the north pole, the positive X axis goes through the PrimeMeridian, and the positive Y axis goes 90° east of the prime meridian.
Geocentric Cartesian coordinates are mainly used internally by GIS systems and GPS receivers. They are not really fit for human consumption. In Carmenta Engine, a DataSet cannot store data in geocentric Cartesian coordinates, because a DataSet is queried with a two-dimensional rectangle, not a three-dimensional box.
Geocentric Cartesian coordinates are also known as ECEF coordinates (Earth-Centered, Earth-Fixed coordinates).
See also ProjectFromGeocentricXYZ.
Platforms
Windows, Linux, Android