geo/tcSrtmData.h

   1 /***************************************************************************
   2  *   This file is part of Tecorrec.                                        *
   3  *   Copyright 2008 James Hogan <james@albanarts.com>                      *
   4  *                                                                         *
   5  *   Tecorrec is free software: you can redistribute it and/or modify      *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation, either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   Tecorrec is distributed in the hope that it will be useful,           *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with Tecorrec.  If not, write to the Free Software Foundation,  *
  17  *   Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.   *
  18  ***************************************************************************/
  19
  20 #ifndef _tcSrtmData_h_
  21 #define _tcSrtmData_h_
  22
  23 /**
  24  * @file tcSrtmData.h
  25  * @brief Block of raw SRTM elevation data.
  26  */
  27
  28 #include "tcGeo.h"
  29
  30 #include <QObject>
  31
  32 #include <inttypes.h>
  33
  34 class QFile;
  35 class QString;
  36
  37 /// Block of raw SRTM elevation data.
  38 class tcSrtmData : public QObject
  39 {
  40     Q_OBJECT
  41
  42   public:
  43
  44     /*
  45      * Constructors + destructor
  46      */
  47
  48     /** Load SRTM data.
  49      * @param lon Longitude in degrees.
  50      * @param lat Latitude in degrees.
  51      * @param file File to read data from.
  52      */
  53     tcSrtmData(int lon, int lat, QFile& file, QObject* progressObj, const char* progressMember);
  54
  55     /// Destructor.
  56     virtual ~tcSrtmData();
  57
  58     /*
  59      * Accessors
  60      */
  61
  62     /// Get the longitude in degrees.
  63     int lon() const;
  64
  65     /// Get the latitude in degrees.
  66     int lat() const;
  67
  68     /// Get the number of scan lines.
  69     int lines() const;
  70
  71     /// Get the number of samples in each scan line.
  72     int samples() const;
  73
  74     /// Find the geographical angles between samples.
  75     tcGeo sampleResolution() const;
  76
  77     /// Get the geographical coordinate of a sample.
  78     tcGeo sampleCoordinate(int line, int sample) const;
  79
  80     /// Does data exist for a sample?
  81     bool sampleExists(int line, int sample) const;
  82
  83     /// Get the altitude at a sample (interpolating gaps).
  84     uint16_t sampleAltitude(int line, int sample, bool corrected = false, bool* exists = 0) const;
  85
  86     /// Get the altitude at a coordinate.
  87     float sampleAltitude(const tcGeo& coord, bool corrected = false, bool* exists = 0) const;
  88
  89     /*
  90      * Mutators
  91      */
  92
  93     /// Correct the altitude at a sample.
  94     void setSampleAltitude(int line, int sample, uint16_t altitude);
  95
  96     /// Fill voids using bilinear interpolation.
  97     void fillVoidsBilinear();
  98
  99     /// Fill voids using bicubic interpolation.
 100     void fillVoidsBicubic();
 101
 102   signals:
 103
 104     /*
 105      * Signals
 106      */
 107
 108     /// Process notifier.
 109     void progressing(const QString& message);
 110
 111   private:
 112
 113     /*
 114      * Private functions
 115      */
 116
 117     /// Index into the data array.
 118     unsigned int indexData(int corrected, int line, int sample) const;
 119
 120   private:
 121
 122     /*
 123      * Variables
 124      */
 125
 126     /// Longitude in degrees.
 127     int m_lat;
 128
 129     /// Latitude in degrees.
 130     int m_lon;
 131
 132     /// Number of scan lines.
 133     int m_lines;
 134
 135     /// Number of samples per scan line.
 136     int m_samples;
 137
 138     /** Fixed resolution elevation data.
 139      * Indexed by correction, scanline, sample.
 140      * Most significant bit means that original data is missing.
 141      */
 142     uint16_t* m_data;
 143 };
 144
 145 #endif
 146