src/dem.h

   1 #ifndef __VIKING_DEM_H
   2 #define __VIKING_DEM_H
   3
   4 #define VIK_DEM_INVALID_ELEVATION -32768
   5
   6 /* unit codes */
   7 #define VIK_DEM_HORIZ_UTM_METERS 2
   8 #define VIK_DEM_HORIZ_LL_ARCSECONDS  3
   9
  10 #define VIK_DEM_VERT_DECIMETERS 2
  11
  12 #define VIK_DEM_VERT_METERS 1 /* wrong in 250k?  */
  13
  14
  15 typedef struct {
  16   guint n_columns;
  17   GPtrArray *columns;
  18
  19   guint8 horiz_units;
  20   guint8 orig_vert_units; /* original, always converted to meters when loading. */
  21   gdouble east_scale; /* gap between samples */
  22   gdouble north_scale;
  23
  24   gdouble min_east, min_north, max_east, max_north;
  25
  26   guint8 utm_zone;
  27   gchar utm_letter;
  28 } VikDEM;
  29
  30 typedef struct {
  31   /* east-west coordinate for ALL items in the column */
  32   gdouble east_west;
  33
  34   /* coordinate of northern and southern boundaries */
  35   gdouble south;
  36 //  gdouble north;
  37
  38   guint n_points;
  39   gint16 *points;
  40 } VikDEMColumn;
  41
  42
  43 VikDEM *vik_dem_new_from_file(const gchar *file);
  44 void vik_dem_free ( VikDEM *dem );
  45 gint16 vik_dem_get_xy ( VikDEM *dem, guint x, guint y );
  46
  47 gint16 vik_dem_get_east_north ( VikDEM *dem, gdouble east, gdouble north );
  48
  49 void vik_dem_east_north_to_xy ( VikDEM *dem, gdouble east, gdouble north, guint *col, guint *row );
  50
  51 #endif