ncl_maptra - Man Page

CALL MAPTRA (RLAT,RLON,UVAL,VVAL)

#include <ncarg/ncargC.h>

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

RLAT and RLON

(input expressions, of type REAL) are the latitude and longitude, respectively, of a point on the globe. RLAT must be between -90. and +90., inclusive; RLON must be between -540. and +540., inclusive.

UVAL and VVAL

(output variables, of type REAL) define the point (UVAL,VVAL) that is the projection in the u/v plane of (RLAT,RLON). The units of UVAL and VVAL depend on the projection.

If the point is not projectable or if it is outside the boundary of the map (as defined by the last call to MAPSET and by the value of the parameter 'EL'), UVAL is 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, cmptra, fgkgtx, fngngdts.

To use MAPTRA or c_maptra, 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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