src/dem.h

/*
 * 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
 *
 */

#ifndef __VIKING_DEM_H
#define __VIKING_DEM_H

#define VIK_DEM_INVALID_ELEVATION -32768

/* unit codes */
#define VIK_DEM_HORIZ_UTM_METERS 2
#define VIK_DEM_HORIZ_LL_ARCSECONDS  3

#define VIK_DEM_VERT_DECIMETERS 2

#define VIK_DEM_VERT_METERS 1 /* wrong in 250k?	 */


typedef struct {
  guint n_columns;
  GPtrArray *columns;

  guint8 horiz_units;
  guint8 orig_vert_units; /* original, always converted to meters when loading. */
  gdouble east_scale; /* gap between samples */
  gdouble north_scale;

  gdouble min_east, min_north, max_east, max_north;

  guint8 utm_zone;
  gchar utm_letter;
} VikDEM;

typedef struct {
  /* east-west coordinate for ALL items in the column */
  gdouble east_west;

  /* coordinate of northern and southern boundaries */
  gdouble south;
//  gdouble north;

  guint n_points;
  gint16 *points;
} VikDEMColumn;


VikDEM *vik_dem_new_from_file(const gchar *file);
void vik_dem_free ( VikDEM *dem );
gint16 vik_dem_get_xy ( VikDEM *dem, guint x, guint y );

gint16 vik_dem_get_east_north ( VikDEM *dem, gdouble east, gdouble north );
gint16 vik_dem_get_simple_interpol ( VikDEM *dem, gdouble east, gdouble north );
gint16 vik_dem_get_shepard_interpol ( VikDEM *dem, gdouble east, gdouble north );
gint16 vik_dem_get_best_interpol ( VikDEM *dem, gdouble east, gdouble north );

void vik_dem_east_north_to_xy ( VikDEM *dem, gdouble east, gdouble north, guint *col, guint *row );

#endif
Commit	Line	Data
	1	/*
	2	* viking -- GPS Data and Topo Analyzer, Explorer, and Manager
	3	*
	4	* Copyright (C) 2003-2008, Evan Battaglia <gtoevan@gmx.net>
	5	*
	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.
	10	*
	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.
	15	*
	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
	19	*
	20	*/
	21
	22	#ifndef __VIKING_DEM_H
	23	#define __VIKING_DEM_H
	24
	25	#define VIK_DEM_INVALID_ELEVATION -32768
	26
	27	/* unit codes */
	28	#define VIK_DEM_HORIZ_UTM_METERS 2
	29	#define VIK_DEM_HORIZ_LL_ARCSECONDS 3
	30
	31	#define VIK_DEM_VERT_DECIMETERS 2
	32
	33	#define VIK_DEM_VERT_METERS 1 /* wrong in 250k? */
	34
	35
	36	typedef struct {
	37	guint n_columns;
	38	GPtrArray *columns;
	39
	40	guint8 horiz_units;
	41	guint8 orig_vert_units; /* original, always converted to meters when loading. */
	42	gdouble east_scale; /* gap between samples */
	43	gdouble north_scale;
	44
	45	gdouble min_east, min_north, max_east, max_north;
	46
	47	guint8 utm_zone;
	48	gchar utm_letter;
	49	} VikDEM;
	50
	51	typedef struct {
	52	/* east-west coordinate for ALL items in the column */
	53	gdouble east_west;
	54
	55	/* coordinate of northern and southern boundaries */
	56	gdouble south;
	57	// gdouble north;
	58
	59	guint n_points;
	60	gint16 *points;
	61	} VikDEMColumn;
	62
	63
	64	VikDEM vik_dem_new_from_file(const gchar file);
	65	void vik_dem_free ( VikDEM *dem );
	66	gint16 vik_dem_get_xy ( VikDEM *dem, guint x, guint y );
	67
	68	gint16 vik_dem_get_east_north ( VikDEM *dem, gdouble east, gdouble north );
	69	gint16 vik_dem_get_simple_interpol ( VikDEM *dem, gdouble east, gdouble north );
	70	gint16 vik_dem_get_shepard_interpol ( VikDEM *dem, gdouble east, gdouble north );
	71	gint16 vik_dem_get_best_interpol ( VikDEM *dem, gdouble east, gdouble north );
	72
	73	void vik_dem_east_north_to_xy ( VikDEM dem, gdouble east, gdouble north, guint col, guint *row );
	74
	75	#endif