NAME

       MAPTRA - Projects points.

SYNOPSIS

       CALL MAPTRA (RLAT,RLON,UVAL,VVAL)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

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

DESCRIPTION

       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.

C-BINDING DESCRIPTION

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

EXAMPLES

       Use the ncargex command to see the following relevant examples: ccpmpxy, cmptra, fgkgtx,
       fngngdts.

ACCESS

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

SEE ALSO

       Online: ezmap, ezmap_params, mapaci, mapbla, mapblm, mapdrw, mapeod, mapfst, mapgci,
       mapgrd, mapgrm, mapgtc, mapgti, mapgtl, mapgtr, mapint, mapiq, mapiqa, mapiqd, mapiqm,
       mapit, mapita, mapitd, mapitm, maplbl, maplmb, maplot, mappos, maproj, maprs, maprst,
       mapsav, mapset, mapstc, mapsti, mapstl, mapstr, maptri, maptrn, mapusr, mapvec, mpchln,
       mpfnme, mpgetc, mpgeti, mpgetl, mpgetr, mpglty, mpiaty, mpifnb, mpilnb, mpiola, mpiosa,
       mpipai, mpipan, mpipar, mpisci, mplnam, mplndm, mplndr, mplnri, mpname, mprset, mpsetc,
       mpseti, mpsetl, mpsetr, supmap, supcon, ncarg_cbind

       Hardcopy: NCAR Graphics Contouring and Mapping Tutorial

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.