Welcome to the Harris Geospatial product documentation center. Here you will find reference guides, help documents, and product libraries.


  >  Docs Center  >  ENVI API  >  Data Control  >  ENVIPseudoRasterSpatialRef::ConvertMGRSToLonLat

ENVIPseudoRasterSpatialRef::ConvertMGRSToLonLat

ENVIPseudoRasterSpatialRef::ConvertMGRSToLonLat

The ConvertMGRSToLonLat method converts Military Grid Reference System (MGRS) coordinates to a set of geographic latitude/longitude coordinates within one spatial reference.

Pseudo map information refers to a non-standard projection that involves an affine map transformation. When an image is not georeferenced to a standard map projection and you only know the geographic coordinates and map projection of the four corner points of the image, you can define these tie points in an ENVI header file or in the metadata of the raster object. ENVI will use these points to warp the image and to calculate geographic coordinates for each pixel. The pixel size varies in the rectified image. This type of projection contains a high degree of variability and is not geographically accurate; the (x,y) locations in the rectified image are only best guesses.

Syntax


ENVIPseudoRasterSpatialRef.ConvertMGRSToLonLat, MGRS, Lon, Lat [, MODE=integer]

Arguments


MGRS

A string with the MGRS coordinates. You can specify a scalar or a vector of MGRS values.

Lon

A named variable that contains the longitude coordinate

Lat

A named variable that contains the latitude coordinate

Keywords


ERROR

Set this keyword to a named variable that will contain any error message issued during execution of this routine. If no error occurs, the ERROR variable will be set to a null string (''). If an error occurs and the routine is a function, then the function result will be undefined.

When this keyword is not set and an error occurs, ENVI returns to the caller and execution halts. In this case, the error message is contained within !ERROR_STATE and can be caught using IDL's CATCH routine. See IDL Help for more information on !ERROR_STATE and CATCH.

See Manage Errors for more information on error handling in ENVI programming.

MODE

Set this keyword to one of the following integers to determine the format in describing a point on an MGRS grid:

  • 0: Automatic (default)
  • 1: All spheroids are treated the same as WGS-84
  • 2: All spheroids are treated the same as Clarke 1866 or Bessel
  • 10: Automatic; a longitude value of +180 is in Zone 1
  • 11: All spheroids are treated the same as WGS-84; a longitude value of +180 is in Zone 1
  • 12: All spheroids are treated the same as Clarke 1866 or Bessel; a longitude value of +180 is in Zone 1

Version History


ENVI 5.1

Introduced

API Version


3.2

See Also


ENVIPseudoRasterSpatialRef, ENVIRPCRasterSpatialRef::ConvertMGRSToLonLat, ENVIStandardRasterSpatialRef::ConvertMGRSToLonLat



© 2018 Harris Geospatial Solutions, Inc. |  Legal
My Account    |    Store    |    Contact Us