GeoGridPosition[{x, y, z}, projection]
represents a point in a planimetric cartographic grid using the specified projection.


  • GeoGridPosition[pos, projection] converts from any geographic position to a grid point, essentially computing a cartographic projection. Any of the following coordinate types can be given: GeoPosition, GeoPositionXYZ, GeoPositionENU, GeoGridPosition.
  • Projections can be specified in the following forms:
  • "proj"named projection with default parameter values
    {"proj",1,...}projection with standard parallels specified
    {{"proj",...},{lat,long}}projection centered on the specified position
    {proj,opts}projection with detailed options specified
  • Names of possible projections are given by GeoProjectionData[].
  • Default values of options for a particular named projection are given by GeoProjectionData[proj].
  • GeoGridPosition[{x, y}] represents a point in a cartographic grid, assuming a standard ellipsoid height of zero.
  • GeoGridPosition[{x, y, z, t}] includes a time, given as a date t in decimal years.

ExamplesExamplesopen allclose all

Basic Examples (3)Basic Examples (3)

Convert a geodetic position to a grid point using a spherical gnomonic projection:

Click for copyable input

Convert back to a geodetic position:

Click for copyable input

Compute a spherical gnomonic projection using a custom setting for the central meridian:

Click for copyable input

Compute a projection using explicitly specified projection parameters:

Click for copyable input
New in 7
New to Mathematica? Find your learning path »
Have a question? Ask support »