93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
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/*
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Copyright (c) 2006 Alex Tingle
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef NASA_GRID_SQUARE_H
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#define NASA_GRID_SQUARE_H
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#include <string>
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#include <zip.h>
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#include "utils.h"
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#include <cmath>
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#include <iostream>
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#include <string>
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#include "utils.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <iomanip>
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#include <sstream>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "../../typedefs.h"
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class NasaGridSquare {
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public:
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NasaGridSquare(const char* filename);
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NasaGridSquare(int lng, int lat);
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~NasaGridSquare();
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short height(float lng_fraction, float lat_fraction) const;
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const static short NO_DATA =-32768; ///< NASA's magic number for no data.
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/** Formula for grid squares' unique keys. */
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static int key(int lng, int lat) {
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return 1000*lat + lng;
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}
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/** Calculate unique key for this object. */
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int key() const {return key(longitude,latitude);}
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unsigned int cols() const {return num_cols;}
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unsigned int rows() const {return num_rows;}
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bool has_data() const {return bool(data);}
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private:
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void* data; ///< mmap'd data file.
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char * data2;
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int longitude;
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int latitude;
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int fd; ///< File ID for mmap'd data file.
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unsigned int num_bytes; ///< Length of data.
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unsigned int num_rows;
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unsigned int num_cols;
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std::string make_filename(const char* ext) const;
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void parse_filename(const char* filename, int& lng, int& lat);
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/** Loads the file into memory, pointed to by 'data'. Sets num_bytes. */
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void load(const char* filename);
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void unload();
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/** Converts lng,lat floats to col,row ints. Returns TRUE if result valid. */
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bool lngLat_to_colRow(
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float lng_fraction, float lat_fraction,
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unsigned int& col, unsigned int& row
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) const;
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short getHeight(unsigned int col, unsigned int row) const;
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friend class ReducedGridSquare;
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}; // end class NasaGridSquare
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#endif // NASA_GRID_SQUARE_H
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