+/*
+ * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
+ *
+ * Copyright (C) 2003-2008, Evan Battaglia <gtoevan@gmx.net>
+ *
+ * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
#include <stdio.h>
+#ifdef HAVE_STRING_H
#include <string.h>
+#endif
#include <glib.h>
+#ifdef HAVE_MATH_H
#include <math.h>
+#endif
+#ifdef HAVE_STDLIB_H
#include <stdlib.h>
+#endif
#include <zlib.h>
#include <sys/types.h>
#include <sys/stat.h>
+#ifdef HAVE_UNISTD_H
#include <unistd.h>
-#include <sys/mman.h>
+#endif
+#include <glib/gstdio.h>
+#include <glib/gi18n.h>
#include "dem.h"
#include "file.h"
*tmp = g_strtod(*buffer, &endptr);
if ( endptr == NULL|| endptr == *buffer ) {
if ( warn )
- g_warning("Invalid DEM");
+ g_warning(_("Invalid DEM"));
return FALSE;
}
*buffer=endptr;
*tmp = strtol(*buffer, &endptr, 10);
if ( endptr == NULL|| endptr == *buffer ) {
if ( warn )
- g_warning("Invalid DEM");
+ g_warning(_("Invalid DEM"));
return FALSE;
}
*buffer=endptr;
/* skip numbers 5-19 */
for ( i = 0; i < 15; i++ ) {
if ( ! get_double_and_continue(&buffer, &val, FALSE) ) {
- g_warning ("Invalid DEM header");
+ g_warning (_("Invalid DEM header"));
return FALSE;
}
}
/* 1 x n_rows 1 east_west south x x x DATA */
if ( (!get_double_and_continue(&buffer, &tmp, TRUE)) || tmp != 1 ) {
- g_warning("Incorrect DEM Class B record: expected 1");
+ g_warning(_("Incorrect DEM Class B record: expected 1"));
return;
}
n_rows = (guint) tmp;
if ( (!get_double_and_continue(&buffer, &tmp, TRUE)) || tmp != 1 ) {
- g_warning("Incorrect DEM Class B record: expected 1");
+ g_warning(_("Incorrect DEM Class B record: expected 1"));
return;
}
local_file_header = (struct _lfh *) zip_file;
if (local_file_header->sig != 0x04034b50) {
- g_warning("%s(): wrong format\n", __PRETTY_FUNCTION__);
+ g_warning("%s(): wrong format", __PRETTY_FUNCTION__);
g_free(unzip_data);
goto end;
}
return(unzip_data);
}
-static VikDEM *vik_dem_read_srtm_hgt(FILE *f, const gchar *basename, gboolean zip)
+static VikDEM *vik_dem_read_srtm_hgt(const gchar *file_name, const gchar *basename, gboolean zip)
{
gint i, j;
VikDEM *dem;
- struct stat stat;
off_t file_size;
gint16 *dem_mem = NULL;
- gint16 *dem_file = NULL;
+ gchar *dem_file = NULL;
const gint num_rows_3sec = 1201;
const gint num_rows_1sec = 3601;
gint num_rows;
- int fd = fileno(f);
+ GMappedFile *mf;
gint arcsec;
+ GError *error = NULL;
dem = g_malloc(sizeof(VikDEM));
dem->columns = g_ptr_array_new();
dem->n_columns = 0;
- if (fstat(fd, &stat) == -1)
- g_error("%s(): fstat failed on %s\n", __PRETTY_FUNCTION__, basename);
- if ((dem_file = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) == (void *) -1)
- g_error("%s(): mmap failed on %s\n", __PRETTY_FUNCTION__, basename);
-
- file_size = stat.st_size;
- dem_mem = dem_file;
+ if ((mf = g_mapped_file_new(file_name, FALSE, &error)) == NULL) {
+ g_error(_("Couldn't map file %s: %s"), file_name, error->message);
+ g_error_free(error);
+ g_free(dem);
+ return NULL;
+ }
+ file_size = g_mapped_file_get_length(mf);
+ dem_file = g_mapped_file_get_contents(mf);
+
if (zip) {
void *unzip_mem = NULL;
gulong ucsize;
- if ((unzip_mem = unzip_hgt_file((gchar *)dem_file, &ucsize)) == NULL) {
- munmap(dem_file, file_size);
+ if ((unzip_mem = unzip_hgt_file(dem_file, &ucsize)) == NULL) {
+ g_mapped_file_free(mf);
g_ptr_array_free(dem->columns, TRUE);
g_free(dem);
return NULL;
else if (file_size == (num_rows_1sec * num_rows_1sec * sizeof(gint16)))
arcsec = 1;
else {
- g_warning("%s(): file %s does not have right size\n", __PRETTY_FUNCTION__, basename);
- munmap(dem_file, file_size);
- g_ptr_array_free(dem->columns, TRUE);
+ g_warning("%s(): file %s does not have right size", __PRETTY_FUNCTION__, basename);
+ g_mapped_file_free(mf);
g_free(dem);
return NULL;
}
if (zip)
g_free(dem_mem);
- munmap(dem_file, stat.st_size);
+ g_mapped_file_free(mf);
return dem;
}
VikDEM *vik_dem_new_from_file(const gchar *file)
{
- FILE *f;
+ FILE *f=NULL;
VikDEM *rv;
gchar buffer[DEM_BLOCK_SIZE+1];
gint cur_row = -1;
const gchar *basename = a_file_basename(file);
- /* FILE IO */
- f = fopen(file, "r");
- if ( !f )
+ if ( g_access ( file, R_OK ) != 0 )
return NULL;
if ( (strlen(basename)==11 || ((strlen(basename) == 15) && (basename[11] == '.' && basename[12] == 'z' && basename[13] == 'i' && basename[14] == 'p'))) &&
basename[7]=='.' && basename[8]=='h' && basename[9]=='g' && basename[10]=='t' &&
(basename[0] == 'N' || basename[0] == 'S') && (basename[3] == 'E' || basename[3] =='W')) {
gboolean is_zip_file = (strlen(basename) == 15);
- rv = vik_dem_read_srtm_hgt(f, basename, is_zip_file);
- fclose(f);
+ rv = vik_dem_read_srtm_hgt(file, basename, is_zip_file);
return(rv);
}
rv = g_malloc(sizeof(VikDEM));
/* Header */
+ f = g_fopen(file, "r");
+ if ( !f ) {
+ g_free ( rv );
+ return NULL;
+ }
buffer[fread(buffer, 1, DEM_BLOCK_SIZE, f)] = '\0';
if ( ! dem_parse_header ( buffer, rv ) ) {
g_free ( rv );
/* TODO - class C records (right now says 'Invalid' and dies) */
fclose(f);
+ f = NULL;
/* 24k scale */
if ( rv->horiz_units == VIK_DEM_HORIZ_UTM_METERS && rv->n_columns >= 2 )
pos.lat = north/3600;
/* order of the data: sw, nw, ne, se */
- cols[0] = (gint) floor((east - dem->min_east) / dem->east_scale); /* sw */
+ /* sw */
+ cols[0] = (gint) floor((east - dem->min_east) / dem->east_scale);
rows[0] = (gint) floor((north - dem->min_north) / dem->north_scale);
- ll[0].lon = (east - fabs(fmod(east, dem->east_scale)))/3600;
- ll[0].lat = (north - fabs(fmod(north, dem->north_scale)))/3600;
-
- cols[1] = cols[0]; /*nw*/
+ ll[0].lon = (dem->min_east + dem->east_scale*cols[0])/3600;
+ ll[0].lat = (dem->min_north + dem->north_scale*rows[0])/3600;
+ /* nw */
+ cols[1] = cols[0];
rows[1] = rows[0] + 1;
ll[1].lon = ll[0].lon;
ll[1].lat = ll[0].lat + (gdouble)dem->north_scale/3600;
-
- cols[2] = cols[0] + 1; /*ne*/
+ /* ne */
+ cols[2] = cols[0] + 1;
rows[2] = rows[0] + 1;
ll[2].lon = ll[0].lon + (gdouble)dem->east_scale/3600;
ll[2].lat = ll[0].lat + (gdouble)dem->north_scale/3600;
-
- cols[3] = cols[0] + 1; /*se*/
+ /* se */
+ cols[3] = cols[0] + 1;
rows[3] = rows[0];
ll[3].lon = ll[0].lon + (gdouble)dem->east_scale/3600;
ll[3].lat = ll[0].lat;
dists[i] = a_coords_latlon_diff(&pos, &ll[i]);
}
+#if 0 /* debug */
+ for (i = 0; i < 4; i++)
+ fprintf(stderr, "%f:%f:%d:%d ", ll[i].lat, ll[i].lon, dists[i], elevs[i]);
+ fprintf(stderr, " north_scale=%f\n", dem->north_scale);
+#endif
+
return TRUE; /* all OK */
}
gint16 vik_dem_get_shepard_interpol ( VikDEM *dem, gdouble east, gdouble north )
{
- return vik_dem_get_simple_interpol(dem, east, north);
+ int i;
+ gint16 elevs[4], dists[4];
+ gint16 max_dist;
+ gdouble t = 0.0;
+ gdouble b = 0.0;
+
+ if (!dem_get_ref_points_elev_dist(dem, east, north, elevs, dists))
+ return VIK_DEM_INVALID_ELEVATION;
+
+ max_dist = 0;
+ for (i = 0; i < 4; i++) {
+ if (dists[i] < 1) {
+ return(elevs[i]);
+ }
+ if (dists[i] > max_dist)
+ max_dist = dists[i];
+ }
+
+ gdouble tmp;
+#if 0 /* derived method by Franke & Nielson. Does not seem to work too well here */
+ for (i = 0; i < 4; i++) {
+ tmp = pow((1.0*(max_dist - dists[i])/max_dist*dists[i]), 2);
+ t += tmp*elevs[i];
+ b += tmp;
+ }
+#endif
+
+ for (i = 0; i < 4; i++) {
+ tmp = pow((1.0/dists[i]), 2);
+ t += tmp*elevs[i];
+ b += tmp;
+ }
+
+ // fprintf(stderr, "DEBUG: tmp=%f t=%f b=%f %f\n", tmp, t, b, t/b);
+
+ return(t/b);
+
}
void vik_dem_east_north_to_xy ( VikDEM *dem, gdouble east, gdouble north, guint *col, guint *row )
projects / andy / viking.git / blobdiff