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/*--------------------------------------------------------------------
* The GMT-system: @(#)grdclip.c 2.39 09/21/99
*
* Copyright (c) 1991-1999 by P. Wessel and W. H. F. Smith
* See COPYING file for copying and redistribution conditions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Contact info: www.soest.hawaii.edu/gmt
*--------------------------------------------------------------------*/
/*
grdclip read a grdfile and sets all values < the user-supplied
lower limit to the value <below>, and all values > the user-
supplied upper limit to the value <above>. above/below can
be any number including NaN.
WHF Smith, 22 Aug 88
Modified for v2.0 4/26/91 P.Wessel
Modified for v3.1 4/29/98 P.Wessel
*/
#include "gmt.h"
float *data;
main (int argc, char **argv)
{
BOOLEAN error, set_above, set_below;
int i, nxy, n_above, n_below, n;
float above, below, low, high;
char *infile, *outfile, format[BUFSIZ], txt[50];
struct GRD_HEADER header;
argc = GMT_begin (argc, argv);
error = set_above = set_below = FALSE;
n_above = n_below = 0;
low = high = 0.0;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
/* Common parameters */
case 'V':
case '\0':
error += GMT_get_common_args (argv[i], 0, 0, 0, 0);
break;
/* Supplemental parameters */
case 'S':
if (argv[i][2] == 'a') {
set_above = TRUE;
n = sscanf (&argv[i][3], "%f/%s", &high, txt);
if (n != 2) {
fprintf (stderr, "%s: GMT SYNTAX ERROR -Sa option. Correct syntax:\n", GMT_program);
fprintf (stderr, "\t-Sa<high>/<above>, <above> may be set to NaN\n");
error = TRUE;
}
else
above = (txt[0] == 'N' || txt[0] == 'n') ? GMT_f_NaN : (float)atof (txt);
}
else if (argv[i][2] == 'b') {
set_below = TRUE;
n = sscanf (&argv[i][3], "%f/%s", &low, txt);
if (n != 2) {
fprintf (stderr, "%s: GMT SYNTAX ERROR -Sb option. Correct syntax:\n", GMT_program);
fprintf (stderr, "\t-Sb<low>/<below>, <below> may be set to NaN\n");
error = TRUE;
}
else
below = (txt[0] == 'N' || txt[0] == 'n') ? GMT_f_NaN : (float)atof (txt);
}
else {
fprintf (stderr, "%s: GMT SYNTAX ERROR -S option. Correct syntax:\n", GMT_program);
fprintf (stderr, "\t-Sa<high>/<above> or -Sb<low>/<below>\n");
error = TRUE;
}
break;
case 'G':
outfile = &argv[i][2];
break;
default:
error = TRUE;
GMT_default_error (argv[i][1]);
break;
}
}
else
infile = argv[i];
}
if (GMT_quick || argc == 1) {
fprintf (stderr, "grdclip %s - Clipping of range in grdfiles\n\n", GMT_VERSION);
fprintf (stderr, "usage: grdclip <input_grdfile> -G<output_grdfile>\n");
fprintf (stderr, "\t[-Sa<high/above>] [-Sb<low/below>] [-V]\n");
if (GMT_quick) exit (EXIT_FAILURE);
fprintf (stderr, "\tYou must choose at least one -S option.\n");
fprintf (stderr, "\t-G name of output grid.\n");
fprintf (stderr, "\n\tOPTIONS:\n");
fprintf (stderr, "\t-Sa will set all data > high to the <above> value.\n");
fprintf (stderr, "\t-Sb will set all data < low to the <below> value.\n");
fprintf (stderr, "\t above/below can be any number including NaN\n");
GMT_explain_option ('V');
GMT_explain_option ('.');
exit (EXIT_FAILURE);
}
if (!outfile) {
fprintf (stderr, "%s: GMT SYNTAX ERROR -G option:. Must specify output file\n", GMT_program);
error++;
}
if (!infile) {
fprintf (stderr, "%s: GMT SYNTAX ERROR:. Must specify input file\n", GMT_program);
error++;
}
if (error) exit (EXIT_FAILURE);
GMT_put_history (argc, argv); /* Update .gmtcommands */
if (GMT_read_grd_info (infile, &header)) {
fprintf (stderr, "%s: Error opening file %s\n", GMT_program, infile);
exit (EXIT_FAILURE);
}
GMT_grd_init (&header, argc, argv, TRUE);
nxy = header.nx * header.ny;
data = (float *) GMT_memory (VNULL, (size_t)nxy, sizeof (float), GMT_program);
if (GMT_read_grd (infile, &header, data, 0.0, 0.0, 0.0, 0.0, GMT_pad, FALSE)) {
fprintf (stderr, "%s: Error reading file %s\n", GMT_program, infile);
exit (EXIT_FAILURE);
}
for (i = 0; i < nxy; i++) {
if (set_above && (!GMT_is_fnan (data[i])) && data[i] > high) {
data[i] = above;
n_above++;
}
else if (set_below && (!GMT_is_fnan (data[i])) && data[i] < low) {
data[i] = below;
n_below++;
}
}
if (GMT_write_grd (outfile, &header, data, 0.0, 0.0, 0.0, 0.0, GMT_pad, FALSE)) {
fprintf (stderr, "%s: Error writing file %s\n", GMT_program, infile);
exit (EXIT_FAILURE);
}
GMT_free ((void *) data);
if (gmtdefs.verbose) {
sprintf (format, "%s set to %s\n\0", gmtdefs.d_format, gmtdefs.d_format);
if (set_below) {
fprintf (stderr, "%s: %d values < ", GMT_program, n_below);
fprintf (stderr, format, (double)low, (double)below);
}
if (set_above) {
fprintf (stderr, "%s: %d values > ", GMT_program, n_above);
fprintf (stderr, format, (double)high, (double)above);
}
}
GMT_end (argc, argv);
}
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