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The ConvertMGRSToLonLat method converts Military Grid Reference System (MGRS) coordinates for a vector file to a set of geographic latitude/longitude coordinates within the same coordinate system.


The following example converts a set of MGRS coordinates in a vector file to lon/lat coordinates.

; Launch the application
file = FILEPATH('qb_boulder_msi_vectors.shp', $
  SUBDIRECTORY = ['data'], ROOT_DIR=e.Root_Dir)
; Create an ENVIVector from the shapefile data
vector = e.OpenVector(file)
; Retrieve a reference to the coordinate system
; Provide MGRS coordinates
MGRS = '13TDE8111427781'
VectCoords.ConvertMGRSToLonLat, MGRS, Lon, Lat
PRINT, 'MGRS coordinates: ',MGRS
PRINT, 'Lon/Lat coordinates: ',Lon, Lat


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



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


A named variable that contains the longitude coordinate


A named variable that contains the latitude coordinate



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.


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


API Version


See Also


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