SYNOPSIS

CALL MAPSET (JLTS, PLM1, PLM2, PLM3, PLM4)

C-BINDING SYNOPSIS

#include <ncarg/ncargC.h>

void c_mapset (char *jlts, float *plm1, float *plm2,
float *plm3, float *plm4)

DESCRIPTION

JLTS

(an input expression, of type CHARACTER) is a character string specifying how the limits of the map are to be chosen. There are six possibilities, as follows:

• JLTS='MA' (MAXIMUM). The maximum useful area produced by the projection is plotted. PLM1, PLM2, PLM3, and PLM4 are not used.
• JLTS='CO' (CORNERS). The points (PLM1,PLM2) and (PLM3,PLM4) are to be at opposite corners of the map. PLM1 and PLM3 are latitudes, in degrees. PLM2 and PLM4 are longitudes, in degrees. If a cylindrical projection is being used, the first point should be on the left edge of the map and the second point on the right edge; otherwise, the order makes no difference.
• JLTS='PO' (POINTS). PLM1, PLM2, PLM3, and PLM4 are two-element arrays giving the latitudes and longitudes, in degrees, of four points which are to be on the edges of the rectangular map. If a cylindrical projection is being used, the first point should be on the left edge and the second point on the right edge; otherwise, the order makes no difference.
• JLTS='AN' (ANGLES). PLM1, PLM2, PLM3, and PLM4 are positive angles, in degrees, representing angular distances from a point on the map to the left, right, bottom, and top edges of the map, respectively. For most projections, these angles are measured with the center of the earth at the vertex and represent angular distances from the point which projects to the origin of the u/v plane; on a satellite-view projection, they are measured with the satellite at the vertex and represent angular deviations from the line of sight. Angular limits are particularly useful for polar projections and for the satellite-view projection; they are not appropriate for the Lambert conformal conic and an error will result if one attempts to use JLTS='AN' with JPRJ='LC'.
• JLTS='LI' (LIMITS). PLM1, PLM2, PLM3, and PLM4 specify the minimum value of u, the maximum value of u, the minimum value of v, and the maximum value of v, respectively. Knowledge of the projection equations is necessary in order to use this option correctly.
• JLTS='GR' (GRID). PLM1, PLM2, PLM3, and PLM4 specify the minimum value of latitude, the minimum value of longitude, the maximum value of latitude, and the maximum value of longitude, in degrees, on a lat/lon grid. The limits will be determined in such a way as to ensure that the entire grid will be visible on the map.

PLM1, PLM2, PLM3, and PLM4

(input arrays, dimensioned 2, of type REAL) are as described above, depending on the value of JLTS. Note that each is a two-element array. Strictly speaking, the FORTRAN standard requires that they be declared as such, even when only the first element of each array is used.

C-BINDING DESCRIPTION

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

USAGE

This routine allows you to set the current values of the EZMAP parameters 'AR', 'P1', 'P2', ... 'P7', and 'P8'. For a complete list of parameters available in this utility, see the ezmap_params man page.

EXAMPLES

Use the ncargex command to see the following relevant examples: ccpcica, ccpmap, ccpmovi, ccppole, ccpvp, colcon, cezmap1, cezmap2, cezmap3, cmpclr, cmpdd, cmpdrw, cmpfil, cmpgrd, cmpgrp, cmpita, cmpitm, cmplab, cmplbl, cmplot, cmpmsk, cmpou, cmptra, cpex01, cpex03, cpex08, cpex09, mpex01, mpex02, mpex04, mpex07, mpex09, mpex10, eezmpa, tezmap, tezmpa, fcover, ffex00, ffex02, ffex03, ffex05, fgkgpl, fgkgtx, fngngdts.

ACCESS

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

MESSAGES

See the ezmap man page for a description of all EZMAP error messages and/or informational messages.

COPYRIGHT

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