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/*--------------------------------------------------------------------
* The GMT-system: @(#)grd2xyz.c 2.58 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
*--------------------------------------------------------------------*/
/*
* grd2xyz.c reads a grd file and prints out the x,y,z values to
* standard output.
*
* Author: Paul Wessel
* Date: 3-JAN-1991
* Version: 2.0 Based on old v1.x
* Revised: 12-SEP-1998 for GMT 3.1
*/
#include "gmt.h"
float *z;
main (int argc, char **argv)
{
BOOLEAN error = FALSE, global = FALSE, z_only = FALSE, b_only = FALSE, suppress = FALSE;
int i, j, ij, nm, nx, ny, one_or_zero, ix, iy, gmt_ij, n_suppressed = 0;
double w, e, s, n, d, *x, *y, out[3], d_value;
char *grdfile = CNULL;
struct GRD_HEADER grd;
struct GMT_Z_IO r;
argc = GMT_begin (argc, argv);
w = e = s = n = 0.0;
GMT_init_z_io (&r, FALSE);
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
/* Common parameters */
case 'H':
case 'R':
case 'V':
case ':':
case '\0':
error += GMT_get_common_args (argv[i], &w, &e, &s, &n);
break;
case 'b':
error += GMT_io_selection (&argv[i][2]);
b_only = TRUE;
break;
case 'Z':
error += GMT_parse_z_io (&argv[i][2], &r, FALSE);
z_only = TRUE;
break;
case 'S':
suppress = TRUE;
break;
default:
error = TRUE;
GMT_default_error (argv[i][1]);
break;
}
}
else
grdfile = argv[i];
}
if (argc == 1 || GMT_quick) {
fprintf (stderr, "grd2xyz %s - Converting a netCDF grdfile to an ASCII xyz-file\n\n", GMT_VERSION);
fprintf( stderr, "usage: grd2xyz grdfile [-H[<nrec>]] [-Rw/e/s/n] [-S] [-V] [-Z[<flags>]] [-:] [-bo[s]] > xyzfile\n");
if (GMT_quick) exit (EXIT_FAILURE);
fprintf (stderr, " grdfile is the grd file to convert\n");
fprintf (stderr, "\n\tOPTIONS:\n");
fprintf (stderr, " -H Write 1 ASCII header record [Default is no header]\n");
GMT_explain_option ('R');
fprintf (stderr, " -S Suppress output for nodes whose z equals NaN [Default prints all nodes]\n");
GMT_explain_option ('V');
fprintf (stderr, " -Z sets exact specification of resulting 1-column output z-table\n");
fprintf (stderr, " If data is in row format, state if first row is at T(op) or B(ottom)\n");
fprintf (stderr, " Then, append L or R to indicate starting point in row\n");
fprintf (stderr, " If data is in column format, state if first columns is L(left) or R(ight)\n");
fprintf (stderr, " Then, append T or B to indicate starting point in column\n");
fprintf (stderr, " Append x if gridline-registered, periodic data in x without repeating column at xmax\n");
fprintf (stderr, " Append y if gridline-registered, periodic data in y without repeating row at ymax\n");
fprintf (stderr, " Specify one of the following data types (all binary except a):\n");
fprintf (stderr, " a Ascii\n");
fprintf (stderr, " c signed 1-byte character\n");
fprintf (stderr, " u unsigned 1-byte character\n");
fprintf (stderr, " h signed short 2-byte integer\n");
fprintf (stderr, " H unsigned short 2-byte integer\n");
fprintf (stderr, " i signed 4-byte integer\n");
fprintf (stderr, " I unsigned 4-byte integer\n");
fprintf (stderr, " l long (4- or 8-byte) integer\n");
fprintf (stderr, " f 4-byte floating point single precision\n");
fprintf (stderr, " d 8-byte floating point double precision\n");
fprintf (stderr, " [Default format is scanline orientation in ascii representation: -ZTLa]\n");
GMT_explain_option (':');
GMT_explain_option ('o');
GMT_explain_option ('.');
exit (EXIT_FAILURE);
}
if (!grdfile) {
fprintf (stderr, "%s: GMT SYNTAX ERROR: Must specify input file\n", GMT_program);
error++;
}
if (b_only && z_only) GMT_io.binary[1] = FALSE;
if ((GMT_io.binary[1] || r.binary) && gmtdefs.io_header) {
fprintf (stderr, "%s: GMT SYNTAX ERROR. Binary output data cannot have header -H\n", GMT_program);
error++;
}
if (error) exit (EXIT_FAILURE);
GMT_put_history (argc, argv); /* Update .gmtcommands */
if (b_only && z_only) fprintf (stderr, "%s: GMT Warning. -Z overrides -bo\n", GMT_program);
if (GMT_read_grd_info (grdfile, &grd)) {
fprintf (stderr, "%s: Error opening file %s\n", GMT_program, grdfile);
exit (EXIT_FAILURE);
}
#ifdef SET_IO_MODE
GMT_setmode (1);
#endif
ix = (gmtdefs.xy_toggle) ? 1 : 0; iy = 1 - ix; /* Set up which columns have x and y */
nm = grd.nx * grd.ny;
if (e > w && n > s) {
global = (fabs (grd.x_max - grd.x_min) == 360.0);
if (!global && (w < grd.x_min || e > grd.x_max)) error = TRUE;
if (s < grd.y_min || n > grd.y_max) error = TRUE;
if (error) {
fprintf (stderr, "%s: GMT ERROR: Subset exceeds data domain!\n", GMT_program);
exit (EXIT_FAILURE);
}
one_or_zero = (grd.node_offset) ? 0 : 1;
nx = irint ((e - w) / grd.x_inc) + one_or_zero;
ny = irint ((n - s) / grd.y_inc) + one_or_zero;
z = (float *) GMT_memory (VNULL, (size_t) (nx * ny), sizeof (float), GMT_program);
if (GMT_read_grd (grdfile, &grd, z, w, e, s, n, GMT_pad, FALSE)) {
fprintf (stderr, "%s: Error reading file %s\n", GMT_program, grdfile);
exit (EXIT_FAILURE);
}
}
else {
z = (float *) GMT_memory (VNULL, (size_t) nm, sizeof (float), GMT_program);
if (GMT_read_grd (grdfile, &grd, z, 0.0, 0.0, 0.0, 0.0, GMT_pad, FALSE)) {
fprintf (stderr, "%s: Error reading file %s\n", GMT_program, grdfile);
exit (EXIT_FAILURE);
}
}
GMT_set_z_io (&r, &grd);
if (z_only) {
if (gmtdefs.io_header && !r.binary) printf ("%s\n", grd.z_units);
for (ij = 0; ij < r.n_expected; ij++) {
(r.get_gmt_ij) (&r, ij, &gmt_ij);
d_value = z[gmt_ij];
if (suppress && GMT_is_dnan (d_value)) {
n_suppressed++;
continue;
}
if ((r.x_missing && r.gmt_i == r.x_period) || (r.y_missing && r.gmt_j == 0)) continue;
(r.write_item) (GMT_stdout, d_value);
}
}
else {
x = (double *) GMT_memory (VNULL, (size_t) grd.nx, sizeof (double), GMT_program);
y = (double *) GMT_memory (VNULL, (size_t) grd.ny, sizeof (double), GMT_program);
/* Compute grid node positions once only */
d = (grd.node_offset) ? 0.5 : 0.0;
for (j = 0; j < grd.ny; j++) y[j] = (j == (grd.ny-1)) ? grd.y_min + d * grd.y_inc : grd.y_max - (j + d) * grd.y_inc;
for (i = 0; i < grd.nx; i++) x[i] = (i == (grd.nx-1)) ? grd.x_max - d * grd.x_inc: grd.x_min + (i + d) * grd.x_inc;
if (gmtdefs.io_header) {
if (!grd.x_units[0]) strcpy (grd.x_units, "x");
if (!grd.y_units[0]) strcpy (grd.y_units, "y");
if (!grd.z_units[0]) strcpy (grd.z_units, "z");
if (gmtdefs.xy_toggle)
printf ("%s\t%s\t%s\n", grd.y_units, grd.x_units, grd.z_units);
else
printf ("%s\t%s\t%s\n", grd.x_units, grd.y_units, grd.z_units);
}
for (j = ij = 0; j < grd.ny; j++) for (i = 0; i < grd.nx; i++, ij++) {
out[2] = z[ij];
if (suppress && GMT_is_dnan (out[2])) {
n_suppressed++;
continue;
}
out[ix] = x[i]; out[iy] = y[j];
GMT_output (GMT_stdout, 3, out);
}
GMT_free ((void *)x);
GMT_free ((void *)y);
}
GMT_free ((void *)z);
if (n_suppressed) fprintf (stderr, "%s: %d NaN values suppressed\n", GMT_program, n_suppressed);
GMT_end (argc, argv);
}
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