ENVIRPCRasterSpatialRef::ConvertLonLatToMap

The ConvertLonLatToMap method converts a set of geographic latitude/longitude coordinates to map coordinates (x-eastings, y-northings) within a Rational Polynomial Coefficient (RPC) spatial reference. The associated ENVIRaster's metadata must include a coordinate system string.

Example

See the example for ENVIStandardRasterSpatialRef::ConvertLonLatToMap. That example shows the pattern of using the ConvertLonLatToMap method, only you would replace the standard spatial reference with an RPC spatial reference.

Syntax

ENVIRPCRasterSpatialRef.ConvertLonLatToMap, Lon, Lat, MapX, MapY

Arguments

Lon

The longitude coordinate. You can specify a scalar or a vector of longitude values; if it is a vector, the Lat argument should also be a vector with the same number of elements:

Lon = [-123.58, -134.64]

Lat = [48.23, 49.56]

Lat

The latitude coordinate

MapX

A named variable that contains the map x-coordinate

MapY

A named variable that contains the map y-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.

Version History

ENVI 5.1

Introduced

API Version

4.2