2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2008, Evan Battaglia <gtoevan@gmx.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #ifndef __VIKING_DEM_H
23 #define __VIKING_DEM_H
29 #define VIK_DEM_INVALID_ELEVATION -32768
32 #define VIK_DEM_HORIZ_UTM_METERS 2
33 #define VIK_DEM_HORIZ_LL_ARCSECONDS 3
35 #define VIK_DEM_VERT_DECIMETERS 2
37 #define VIK_DEM_VERT_METERS 1 /* wrong in 250k? */
45 guint8 orig_vert_units; /* original, always converted to meters when loading. */
46 gdouble east_scale; /* gap between samples */
49 gdouble min_east, min_north, max_east, max_north;
56 /* east-west coordinate for ALL items in the column */
59 /* coordinate of northern and southern boundaries */
68 VikDEM *vik_dem_new_from_file(const gchar *file);
69 void vik_dem_free ( VikDEM *dem );
70 gint16 vik_dem_get_xy ( VikDEM *dem, guint x, guint y );
72 gint16 vik_dem_get_east_north ( VikDEM *dem, gdouble east, gdouble north );
73 gint16 vik_dem_get_simple_interpol ( VikDEM *dem, gdouble east, gdouble north );
74 gint16 vik_dem_get_shepard_interpol ( VikDEM *dem, gdouble east, gdouble north );
75 gint16 vik_dem_get_best_interpol ( VikDEM *dem, gdouble east, gdouble north );
77 void vik_dem_east_north_to_xy ( VikDEM *dem, gdouble east, gdouble north, guint *col, guint *row );