3 // dem.h -- DEM management class
5 // Written by Curtis Olson, started March 1998.
7 // Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
9 // This program is free software; you can redistribute it and/or
10 // modify it under the terms of the GNU General Public License as
11 // published by the Free Software Foundation; either version 2 of the
12 // License, or (at your option) any later version.
14 // This program is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 // (Log is kept at end of this file)
33 #include <Bucket/bucketutils.h>
34 #include <zlib/zlib.h>
38 #define DEM_SIZE_1 1201
42 // file pointer for input
45 // coordinates (in arc seconds) of south west corner
46 double originx, originy;
48 // number of columns and rows
51 // Distance between column and row data points (in arc seconds)
52 double col_step, row_step;
54 // pointers to the actual mesh data allocated here
55 float (*dem_data)[DEM_SIZE_1];
56 float (*output_data)[DEM_SIZE_1];
58 // Current "A" Record Information
59 char dem_description[80], dem_quadrangle[80];
60 double dem_x1, dem_y1, dem_x2, dem_y2, dem_x3, dem_y3, dem_x4, dem_y4;
61 double dem_z1, dem_z2;
62 int dem_resolution, dem_num_profiles;
64 // Current "B" Record Information
65 int prof_col, prof_row;
66 int prof_num_cols, prof_num_rows;
67 double prof_x1, prof_y1;
70 // temporary values for the class to use
77 // Constructor (opens a DEM file)
80 // open a DEM file (use "-" if input is coming from stdin)
81 int open ( char *file );
89 // read and parse DEM "A" record
90 void read_a_record( void );
92 // read and parse DEM "B" record
93 void read_b_record( void );
95 // Informational methods
96 double info_originx( void ) { return(originx); }
97 double info_originy( void ) { return(originy); }
99 // return the current altitude based on mesh data. We should
100 // rewrite this to interpolate exact values, but for now this is
102 double interpolate_altitude( double lon, double lat );
104 // Use least squares to fit a simpler data set to dem data
105 void fit( char *fg_root, double error, struct fgBUCKET *p );
107 // Initialize output mesh structure
108 void outputmesh_init( void );
110 // Get the value of a mesh node
111 double outputmesh_get_pt( int i, int j );
113 // Set the value of a mesh node
114 void outputmesh_set_pt( int i, int j, double value );
116 // Write out a node file that can be used by the "triangle" program
117 void outputmesh_output_nodes( char *fg_root, struct fgBUCKET *p );
128 // Revision 1.3 1998/04/18 03:53:06 curt
129 // Added zlib support.
131 // Revision 1.2 1998/04/14 02:43:28 curt
132 // Used "new" to auto-allocate large DEM parsing arrays in class constructor.
134 // Revision 1.1 1998/04/08 22:57:23 curt
135 // Adopted Gnu automake/autoconf system.
137 // Revision 1.2 1998/03/23 20:35:42 curt
138 // Updated to use FG_EPSILON
140 // Revision 1.1 1998/03/19 02:54:47 curt
141 // Reorganized into a class lib called fgDEM.
143 // Revision 1.1 1998/03/19 01:46:29 curt