1MAPTRI(3NCARG)                   NCAR GRAPHICS                  MAPTRI(3NCARG)
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NAME

6       MAPTRI - Performs inverse transformations.
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SYNOPSIS

9       CALL MAPTRI (UVAL,VVAL,RLAT,RLON)
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C-BINDING SYNOPSIS

12       #include <ncarg/ncargC.h>
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14       void c_maptri (float uval, float vval, float *rlat,
15       float *rlon)
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DESCRIPTION

18       UVAL and VVAL
19                   (input expressions, of type REAL) define the point
20                   (UVAL,VVAL) that is the projection in the u/v plane of the
21                   point whose latitude and longitude are desired. The units
22                   of UVAL and VVAL depend on the projection.
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24       RLAT and RLON
25                   (output variables, of type REAL) are the latitude and
26                   longitude, respectively, of the point, in degrees. RLAT
27                   will be between -90. and +90., inclusive; RLON will be
28                   between -180. and +180., inclusive.
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30                   If the point (UVAL,VVAL) is not the projection of some
31                   point of the globe or is outside the boundary of the map,
32                   RLAT and RLON are returned equal to 1.E12.
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C-BINDING DESCRIPTION

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

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

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

47       Online: ezmap, ezmap_params, mapaci, mapbla, mapblm, mapdrw, mapeod,
48       mapfst, mapgci, mapgrd, mapgrm, mapgtc, mapgti, mapgtl, mapgtr, mapint,
49       mapiq, mapiqa, mapiqd, mapiqm, mapit, mapita, mapitd, mapitm, maplbl,
50       maplmb, maplot, mappos, maproj, maprs, maprst, mapsav, mapset, mapstc,
51       mapsti, mapstl, mapstr, maptra, maptrn, mapusr, mapvec, mpchln, mpfnme,
52       mpgetc, mpgeti, mpgetl, mpgetr, mpglty, mpiaty, mpifnb, mpilnb, mpiola,
53       mpiosa, mpipai, mpipan, mpipar, mpisci, mplnam, mplndm, mplndr, mplnri,
54       mpname, mprset, mpsetc, mpseti, mpsetl, mpsetr, supmap, supcon,
55       ncarg_cbind
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57       Hardcopy: NCAR Graphics Contouring and Mapping Tutorial
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60       Copyright (C) 1987-2007
61       University Corporation for Atmospheric Research
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63       This documentation is free software; you can redistribute it and/or
64       modify it under the terms of the GNU General Public License as
65       published by the Free Software Foundation; either version 2 of the
66       License, or (at your option) any later version.
67
68       This software is distributed in the hope that it will be useful, but
69       WITHOUT ANY WARRANTY; without even the implied warranty of
70       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
71       General Public License for more details.
72
73       You should have received a copy of the GNU General Public License along
74       with this software; if not, write to the Free Software Foundation,
75       Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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79UNIX                              March 1993                    MAPTRI(3NCARG)
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