81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
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/* rawdem.h -- library of routines for processing raw dem files (30 arcsec)
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*
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* Written by Curtis Olson, started February 1998.
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*
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* Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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* (Log is kept at end of this file)
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*/
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#ifndef _RAWDEM_H
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#define _RAWDEM_H
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#define MAX_ROWS 6000
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#define MAX_COLS 7200
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#define MAX_COLS_X_2 14400
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typedef struct {
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/* header info */
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int nrows; /* number of rows */
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int ncols; /* number of cols */
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int ulxmap; /* X coord of center of upper left pixel in arcsec */
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int ulymap; /* Y coord of center of upper left pixel in arcsec */
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int rootx; /* X coord of upper left *edge* of DEM region in degrees */
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int rooty; /* Y coord of upper left *edge* of DEM region in degrees */
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int xdim; /* X dimension of a pixel */
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int ydim; /* Y dimension of a pixel */
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/* file ptr */
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int fd; /* Raw DEM file descriptor */
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/* storage area for a 1 degree high strip of data. Note, for
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* convenience this is in y,x order */
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short strip[120][MAX_ROWS];
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short center[120][120]; /* tile with data taken at center of pixel */
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float edge[121][121]; /* tile with data converted to corners */
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} fgRAWDEM;
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/* Read the DEM header to determine various key parameters for this
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* DEM file */
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void rawReadDemHdr( fgRAWDEM *raw, char *hdr_file );
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/* Open a raw DEM file. */
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void rawOpenDemFile( fgRAWDEM *raw, char *raw_dem_file );
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/* Close a raw DEM file. */
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void rawCloseDemFile( fgRAWDEM *raw );
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/* Read a horizontal strip of (1 vertical degree) from the raw DEM
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* file specified by the upper latitude of the stripe specified in
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* degrees */
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void rawReadStrip( fgRAWDEM *raw, int lat );
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#endif /* _RAWDEM_H */
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/* $Log$
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/* Revision 1.1 1998/03/02 23:31:02 curt
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/* Initial revision.
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/*
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*/
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