ncl_maptri - Man Page

CALL MAPTRI (UVAL,VVAL,RLAT,RLON)

#include <ncarg/ncargC.h>

void c_maptri (float uval, float vval, float *rlat,
float *rlon)

UVAL and VVAL

(input expressions, of type REAL) define the point (UVAL,VVAL) that is the projection in the u/v plane of the point whose latitude and longitude are desired. The units of UVAL and VVAL depend on the projection.

RLAT and RLON

(output variables, of type REAL) are the latitude and longitude, respectively, of the point, in degrees. RLAT will be between -90. and +90., inclusive; RLON will be between -180. and +180., inclusive.

If the point (UVAL,VVAL) is not the projection of some point of the globe or is outside the boundary of the map, RLAT and RLON are returned equal to 1.E12.

The C-binding argument descriptions are the same as the FORTRAN  argument descriptions.

Use the ncargex command to see the following relevant examples:  ccpmpxy, mpex10.

To use MAPTRI or c_maptri, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.  

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Hardcopy:   NCAR Graphics Contouring and Mapping Tutorial

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