NAME

       MAPTRI - Performs inverse transformations.

SYNOPSIS

       CALL MAPTRI (UVAL,VVAL,RLAT,RLON)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

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

DESCRIPTION

       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.

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, mpex10.

ACCESS

       To use MAPTRI or c_maptri, 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,
       maptra, 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.

UNIX                                               March 1993                                     MAPTRI(3NCARG)