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/*
* =========================================================================
* utm2ll - A program to convert UTM coordinates to latitude/longitude coordinates
* Copyright (c) 2000 Fred M. Erickson
*
* 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; either version 2, or (at your option)
* any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* =========================================================================
*
*
* Program to use Redfearn's formulas to convert UTM coordinates
* to latitude/longitude geographical coordinates.
*
* There aren't a lot of comments in this program because it is
* basically a wrapper that calls the appropriate conversion function
* in the file utilities.c. See the comments there for a description
* of the conversion process.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include "drawmap.h"
void
license(void)
{
fprintf(stderr, "This program is free software; you can redistribute it and/or modify\n");
fprintf(stderr, "it under the terms of the GNU General Public License as published by\n");
fprintf(stderr, "the Free Software Foundation; either version 2, or (at your option)\n");
fprintf(stderr, "any later version.\n\n");
fprintf(stderr, "This program is distributed in the hope that it will be useful,\n");
fprintf(stderr, "but WITHOUT ANY WARRANTY; without even the implied warranty of\n");
fprintf(stderr, "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n");
fprintf(stderr, "GNU General Public License for more details.\n\n");
fprintf(stderr, "You should have received a copy of the GNU General Public License\n");
fprintf(stderr, "along with this program; if not, write to the Free Software\n");
fprintf(stderr, "Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\n");
}
main(int argc, char *argv[])
{
double utm_x, utm_y, longitude, latitude;
long zone;
long dtype;
struct datum datum;
if ((argc != 4) && (argc != 5)) {
if ((argc == 2) && (argv[1][0] == '-') && (argv[1][1] == 'L')) {
license();
exit(0);
}
fprintf(stderr, "Convert UTM coordinates to latitude/longitude coordinates.\n");
fprintf(stderr, "Usage: %s utm_x utm_y zone [nad27 | nad83 | wgs84]\n", argv[0]);
fprintf(stderr, "The default is nad27\n.");
exit(0);
}
utm_x = atof(argv[1]);
utm_y = atof(argv[2]);
zone = atoi(argv[3]);
if (argc == 5) {
if (strcmp(argv[4], "nad27") == 0) {
dtype = 0;
}
else if (strcmp(argv[4], "nad83") == 0) {
dtype = 1;
}
else if (strcmp(argv[4], "wgs84") == 0) {
dtype = 2;
}
else {
fprintf(stderr, "Unknown datum specified.\n");
fprintf(stderr, "Usage: %s utm_x utm_y zone [nad27 | nad83 | wgs84]\n", argv[0]);
fprintf(stderr, "Default is nad27.\n");
exit(0);
}
}
else {
dtype = 0;
}
if (dtype == 0) {
/* Fill in the datum parameters for NAD-27. */
datum.a = NAD27_SEMIMAJOR;
datum.b = NAD27_SEMIMINOR;
datum.e_2 = NAD27_E_SQUARED;
datum.f_inv = NAD27_F_INV;
datum.k0 = UTM_K0;
datum.a0 = NAD27_A0;
datum.a2 = NAD27_A2;
datum.a4 = NAD27_A4;
datum.a6 = NAD27_A6;
}
else if (dtype == 1) {
/* Fill in the datum parameters for NAD-83. */
datum.a = NAD83_SEMIMAJOR;
datum.b = NAD83_SEMIMINOR;
datum.e_2 = NAD83_E_SQUARED;
datum.f_inv = NAD83_F_INV;
datum.k0 = UTM_K0;
datum.a0 = NAD83_A0;
datum.a2 = NAD83_A2;
datum.a4 = NAD83_A4;
datum.a6 = NAD83_A6;
}
else {
/* Fill in the datum parameters for WGS-84. */
datum.a = WGS84_SEMIMAJOR;
datum.b = WGS84_SEMIMINOR;
datum.e_2 = WGS84_E_SQUARED;
datum.f_inv = WGS84_F_INV;
datum.k0 = UTM_K0;
datum.a0 = WGS84_A0;
datum.a2 = WGS84_A2;
datum.a4 = WGS84_A4;
datum.a6 = WGS84_A6;
}
if (redfearn_inverse(&datum, utm_x, utm_y, zone, &latitude, &longitude) != 0) {
fprintf(stderr, "error in input parameters.\n");
exit(0);
}
// fprintf(stdout, "(%.10g %.10g %d) ===> (%.10g %.10g)\n", utm_x, utm_y, zone, latitude, longitude);
fprintf(stdout, "%.10g %.10g\n", latitude, longitude);
exit(0);
}
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