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grdedit.c
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1995-03-13
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/*--------------------------------------------------------------------
* The GMT-system: @(#)grdedit.c 2.14 3/13/95
*
* Copyright (c) 1991-1995 by P. Wessel and W. H. F. Smith
* See README file for copying and redistribution conditions.
*--------------------------------------------------------------------*/
/*
* grdedit reads an existing grdfile and takes command line
* arguments to redefine some of the grdheader parameters:
*
* x_min/x_max OR x_inc (the other is recomputed)
* y_min/y_max OR y_inc (the other is recomputed)
* z_scale_factor/z_add_offset
* x_units/y_units/z_units
* title/command/remark
*
* Author: Paul Wessel
* Date: 9-JAN-1991-1995
* Version: 2.0
*/
#include "gmt.h"
float *a;
main (argc, argv)
int argc;
char **argv; {
int i, entry, one_or_zero, dummy[4];
int error = FALSE, got_input = FALSE, got_region = FALSE, shift = FALSE;
double w, e, s, n, shift_amount = 0.0;
char *grdfile, input[512], *ptr;
struct GRD_HEADER grd;
input[0] = 0;
grdfile = CNULL;
w = e = s = n = 0.0;
dummy[3] = dummy[2] = dummy[1] = dummy[0] = 0;
argc = gmt_begin (argc, argv);
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
/* Common parameters */
case 'R':
case '\0':
error += get_common_args (argv[i], &w, &e, &s, &n);
if (argv[i][1] == 'R') got_region = TRUE;
break;
/* Supplemental parameters */
case 'D':
strcpy (input, &argv[i][2]);
got_input = TRUE;
break;
case 'S':
shift = TRUE;
break;
default:
error = TRUE;
gmt_default_error (argv[i][1]);
break;
}
}
else
grdfile = argv[i];
}
if (argc == 1 || gmt_quick) {
fprintf (stderr, "grdedit %s - Modifying the header in a netCDF grdfile\n\n", GMT_VERSION);
fprintf (stderr, "usage: grdedit grdfile [-R<west>/<east>/<south>/<north>\n");
fprintf (stderr, " [-S] [-Dxunit/yunit/zunit/scale/offset/title/remark]\n");
if (gmt_quick) exit (-1);
fprintf (stderr, " grdfile is file to be modified\n");
fprintf (stderr, "\n\tOPTIONS:\n");
fprintf (stderr, " -D to enter information. Specify '=' to get default value\n");
explain_option ('R');
fprintf (stderr, " -S For global grids of 360 degree longitude range.\n");
fprintf (stderr, " Will rotate entire grid to coincide with new borders in -R\n");
exit (-1);
}
if (shift && !got_region) {
fprintf (stderr, "%s: GMT SYNTAX ERROR -S option: Must also specify -R\n", gmt_program);
error++;
}
if (shift && fabs (w - e) != 360.0) {
fprintf (stderr, "%s: GMT SYNTAX ERROR -S option: -R longitudes must span exactly 360 degrees\n", gmt_program);
error++;
}
if (!grdfile) {
fprintf (stderr, "%s: GMT SYNTAX ERROR: Must specify input file\n", gmt_program);
error++;
}
if (error) exit (-1);
if (!strcmp (grdfile, "=")) {
fprintf (stderr, "grdedit: Piping of grdfile not supported!\n");
exit (-1);
}
if (read_grd_info (grdfile, &grd)) {
fprintf (stderr, "grdedit: Error opening file %s\n", grdfile);
exit (-1);
}
if (shift && fabs (grd.x_max - grd.x_min) != 360.0) {
fprintf (stderr, "grdedit: Shift only allowed for global grids\n");
exit (-1);
}
/* Decode grd information given, if any */
if (got_input) {
ptr = strtok (input, "/");
entry = 0;
while (ptr) {
switch (entry) {
case 0:
if (ptr[0] != '=') strcpy (grd.x_units, ptr);
break;
case 1:
if (ptr[0] != '=') strcpy (grd.y_units, ptr);
break;
case 2:
if (ptr[0] != '=') strcpy (grd.z_units, ptr);
break;
case 3:
if (ptr[0] != '=') grd.z_scale_factor = atof (ptr);
break;
case 4:
if (ptr[0] != '=') grd.z_add_offset = atof (ptr);
break;
case 5:
if (ptr[0] != '=') strcpy (grd.title, ptr);
break;
case 6:
if (ptr[0] != '=') strcpy (grd.remark, ptr);
break;
default:
break;
}
ptr = strtok (CNULL, "/");
entry++;
}
}
if (got_region && !shift) {
one_or_zero = (grd.node_offset) ? 0 : 1;
grd.x_min = w; grd.x_max = e;
grd.x_inc = (grd.x_max - grd.x_min) / (grd.nx - one_or_zero);
grd.y_min = s; grd.y_max = n;
grd.y_inc = (grd.y_max - grd.y_min) / (grd.ny - one_or_zero);
}
if (shift) {
shift_amount = w - grd.x_min;
a = (float *) memory (CNULL, (int)(grd.nx * grd.ny), sizeof (float), "grdedit");
read_grd (grdfile, &grd, a, 0.0, 0.0, 0.0, 0.0, dummy, FALSE);
grd_shift (&grd, a, shift_amount);
write_grd (grdfile, &grd, a, 0.0, 0.0, 0.0, 0.0, dummy, FALSE);
free ((char *)a);
}
else if (write_grd_info (grdfile, &grd)) {
fprintf (stderr, "grdedit: Error updating file %s\n", grdfile);
exit (-1);
}
gmt_end (argc, argv);
}