ncl_maptrn (3) - Linux Man Pages
ncl_maptrn: Projects points.
MAPTRN - Projects points.
SUPCON is an alternate name for the routine MAPTRN.
SYNOPSISCALL MAPTRN (RLAT, RLON, UVAL, VVAL)
C-BINDING SYNOPSIS#include <ncarg/ncargC.h>
- 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, UVAL is returned equal to 1.E12. If the point is projectable, but outside the boundary of the map (as defined by the last call to MAPSET and by the value of the parameter 'EL'), the routine MAPTRN, unlike MAPTRA, still returns its u and v coordinates.
C-BINDING DESCRIPTIONThe C-binding argument descriptions are the same as the FORTRAN argument descriptions.
EXAMPLESUse the ncargex command to see the following relevant examples: cpex03, mpex09, bnchmk.
ACCESSTo use MAPTRN or c_maptrn, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.
MESSAGESSee the ezmap man page for a description of all EZMAP error messages and/or informational messages.
COPYRIGHTCopyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.