Function file: [lon,lat] = op_inv(X,Y,params) ¶

This function unprojects cartesian projected coordinates (in a defined cartographic projection) into geodetic coordinates using the PROJ function proj_trans_generic().

INPUT ARGUMENTS:

• X contains by default the X projected coordinates.
• Y contains by default the Y projected coordinates.
• params is a text string containing the projection parameters in PROJ format (ONLY format ’+’ style is allowed, in any other case results are not guaranteed).

OUTPUT ARGUMENTS:

• X contains by default the X projected coordinates.
• Y contains by default the Y projected coordinates.

X or Y can be scalars, vectors or 2D matrices. lon and lat will be according to the higher dimension input argument. Angular units are by default radians and linear meters, although other can be specified in params, so X and Y must be congruent with params. The same applies to the coordinate order at input and output.

If a projection error occurs the resultant coordinates for the affected points have both Inf value and a warning message is emitted (one for each erroneous point).

See also: op_fwd, op_transform.

Package: octproj