GRASS Programmer's Manual  6.4.2(2012)
make_loc.c
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00001 
00002 /******************************************************************************
00003  *
00004  * Project:  libgrass
00005  * Purpose:  Function to create a new location automatically given a 
00006  *           "Cell_head", PROJ_INFO and PROJ_UNITS information.
00007  * Author:   Frank Warmerdam, warmerda@pobox.com
00008  *
00009  ******************************************************************************
00010  * Copyright (c) 2000, Frank Warmerdam
00011  *
00012  * This library is free software; you can redistribute it and/or
00013  * modify it under the terms of the GNU Library General Public
00014  * License as published by the Free Software Foundation; either
00015  * version 2 of the License, or (at your option) any later version.
00016  *
00017  * This library is distributed in the hope that it will be useful,
00018  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00019  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020  * Library General Public License for more details.
00021  *
00022  * You should have received a copy of the GNU Library General Public
00023  * License along with this library; if not, write to the
00024  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00025  ******************************************************************************
00026  *
00027  */
00028 
00029 #include <grass/gis.h>
00030 
00031 #include <stdlib.h>
00032 #include <string.h>
00033 #include <unistd.h>
00034 #include <sys/stat.h>
00035 #include <math.h>
00036 
00037 /*
00038  * Returns 0 on success.
00039  * Returns -1 to indicate a system error (check errno).
00040  */
00041 
00042 
00043 int G__make_location(const char *location_name,
00044                      struct Cell_head *wind,
00045                      struct Key_Value *proj_info,
00046                      struct Key_Value *proj_units, FILE * report_file)
00047 {
00048     char path[GPATH_MAX];
00049     int out_stat;
00050 
00051     /* Try to create the location directory, under the gisdbase. */
00052     sprintf(path, "%s/%s", G_gisdbase(), location_name);
00053     if (G_mkdir(path) != 0)
00054         return -1;
00055 
00056     /* Make the PERMANENT mapset. */
00057     sprintf(path, "%s/%s/%s", G_gisdbase(), location_name, "PERMANENT");
00058     if (G_mkdir(path) != 0)
00059         return -1;
00060 
00061     /* make these the new current location and mapset */
00062     G__setenv("LOCATION_NAME", location_name);
00063     G__setenv("MAPSET", "PERMANENT");
00064 
00065     /* Create the default, and current window files */
00066     G__put_window(wind, "", "DEFAULT_WIND");
00067     G__put_window(wind, "", "WIND");
00068 
00069     /* Write out the PROJ_INFO, and PROJ_UNITS if available. */
00070     if (proj_info != NULL) {
00071         G__file_name(path, "", "PROJ_INFO", "PERMANENT");
00072         G_write_key_value_file(path, proj_info, &out_stat);
00073         if (out_stat != 0)
00074             return -2;
00075     }
00076 
00077     if (proj_units != NULL) {
00078         G__file_name(path, "", "PROJ_UNITS", "PERMANENT");
00079         G_write_key_value_file(path, proj_units, &out_stat);
00080         if (out_stat != 0)
00081             return -2;
00082     }
00083 
00084     return 0;
00085 }
00086 
00087 
00122 int G_make_location(const char *location_name,
00123                     struct Cell_head *wind,
00124                     struct Key_Value *proj_info,
00125                     struct Key_Value *proj_units, FILE * report_file)
00126 {
00127     int err;
00128 
00129     err = G__make_location(location_name, wind, proj_info, proj_units,
00130                            report_file);
00131 
00132     if (err == 0)
00133         return 0;
00134 
00135     if (err == -1) {
00136         perror("G_make_location");
00137     }
00138 
00139     G_fatal_error("G_make_location failed.");
00140 
00141     return 1;
00142 }
00143 
00144 
00145 /************************************************************************/
00146 /*                       G_compare_projections()                        */
00147 
00148 /************************************************************************/
00149 
00163 int
00164 G_compare_projections(const struct Key_Value *proj_info1,
00165                       const struct Key_Value *proj_units1,
00166                       const struct Key_Value *proj_info2,
00167                       const struct Key_Value *proj_units2)
00168 {
00169     const char *proj1, *proj2;
00170 
00171     if (proj_info1 == NULL && proj_info2 == NULL)
00172         return TRUE;
00173 
00174     /* -------------------------------------------------------------------- */
00175     /*      Are they both in the same projection?                           */
00176     /* -------------------------------------------------------------------- */
00177     /* prevent seg fault in G_find_key_value */
00178     if (proj_info1 == NULL || proj_info2 == NULL)
00179         return -1;
00180 
00181     proj1 = G_find_key_value("proj", proj_info1);
00182     proj2 = G_find_key_value("proj", proj_info2);
00183 
00184     if (proj1 == NULL || proj2 == NULL || strcmp(proj1, proj2))
00185         return -1;
00186 
00187     /* -------------------------------------------------------------------- */
00188     /*      Verify that the linear unit translation to meters is OK.        */
00189     /* -------------------------------------------------------------------- */
00190     /* prevent seg fault in G_find_key_value */
00191     if (proj_units1 == NULL && proj_units2 == NULL)
00192         return TRUE;
00193 
00194     if (proj_units1 == NULL || proj_units2 == NULL)
00195         return -2;
00196 
00197     {
00198         double a1 = 0, a2 = 0;
00199 
00200         if (G_find_key_value("meters", proj_units1) != NULL)
00201             a1 = atof(G_find_key_value("meters", proj_units1));
00202         if (G_find_key_value("meters", proj_units2) != NULL)
00203             a2 = atof(G_find_key_value("meters", proj_units2));
00204 
00205         if (a1 && a2 && (fabs(a2 - a1) > 0.000001))
00206             return -2;
00207     }
00208 
00209     /* -------------------------------------------------------------------- */
00210     /*      Do they both have the same ellipsoid?                           */
00211     /*      Lets just check the semi-major axis for now to keep it simple   */
00212     /* -------------------------------------------------------------------- */
00213 
00214     {
00215         double a1 = 0, a2 = 0;
00216 
00217         if (G_find_key_value("a", proj_info1) != NULL)
00218             a1 = atof(G_find_key_value("a", proj_info1));
00219         if (G_find_key_value("a", proj_info2) != NULL)
00220             a2 = atof(G_find_key_value("a", proj_info2));
00221 
00222         if (a1 && a2 && (fabs(a2 - a1) > 0.000001))
00223             return -4;
00224     }
00225 
00226     /* -------------------------------------------------------------------- */
00227     /*      Zone check specially for UTM                                    */
00228     /* -------------------------------------------------------------------- */
00229     if (!strcmp(proj1, "utm") && !strcmp(proj2, "utm")
00230         && atof(G_find_key_value("zone", proj_info1))
00231         != atof(G_find_key_value("zone", proj_info2)))
00232         return -5;
00233 
00234     /* -------------------------------------------------------------------- */
00235     /*      Do they both have the same false easting?                       */
00236     /* -------------------------------------------------------------------- */
00237 
00238     {
00239         char *x_0_1 = NULL, *x_0_2 = NULL;
00240 
00241         x_0_1 = G_find_key_value("x_0", proj_info1);
00242         x_0_2 = G_find_key_value("x_0", proj_info2);
00243 
00244         if (x_0_1 && x_0_2 && (fabs(atof(x_0_1) - atof(x_0_2)) > 0.000001))
00245             return -6;
00246     }
00247 
00248     /* -------------------------------------------------------------------- */
00249     /*      Do they both have the same false northing?                       */
00250     /* -------------------------------------------------------------------- */
00251 
00252     {
00253         char *y_0_1 = NULL, *y_0_2 = NULL;
00254 
00255         y_0_1 = G_find_key_value("y_0", proj_info1);
00256         y_0_2 = G_find_key_value("y_0", proj_info2);
00257 
00258         if (y_0_1 && y_0_2 && (fabs(atof(y_0_1) - atof(y_0_2)) > 0.000001))
00259             return -7;
00260     }
00261 
00262     /* -------------------------------------------------------------------- */
00263     /*      Add more details in later.                                      */
00264     /* -------------------------------------------------------------------- */
00265 
00266     return TRUE;
00267 }
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