/usr/include/qgis/qgszonalstatistics.h is in libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1.
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qgszonalstatistics.h - description
----------------------------
begin : August 29th, 2009
copyright : (C) 2009 by Marco Hugentobler
email : marco at hugis dot net
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSZONALSTATISTICS_H
#define QGSZONALSTATISTICS_H
#include "qgsrectangle.h"
#include <QString>
class QgsGeometry;
class QgsVectorLayer;
class QProgressDialog;
/**A class that calculates raster statistics (count, sum, mean) for a polygon or multipolygon layer and appends the results as attributes*/
class ANALYSIS_EXPORT QgsZonalStatistics
{
public:
QgsZonalStatistics( QgsVectorLayer* polygonLayer, const QString& rasterFile, const QString& attributePrefix = "", int rasterBand = 1 );
~QgsZonalStatistics();
/**Starts the calculation
@return 0 in case of success*/
int calculateStatistics( QProgressDialog* p );
private:
QgsZonalStatistics();
/**Analysis what cells need to be considered to cover the bounding box of a feature
@return 0 in case of success*/
int cellInfoForBBox( const QgsRectangle& rasterBBox, const QgsRectangle& featureBBox, double cellSizeX, double cellSizeY,
int& offsetX, int& offsetY, int& nCellsX, int& nCellsY ) const;
/**Returns statistics by considering the pixels where the center point is within the polygon (fast)*/
void statisticsFromMiddlePointTest( void* band, QgsGeometry* poly, int pixelOffsetX, int pixelOffsetY, int nCellsX, int nCellsY, \
double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, double& sum, double& count );
void statisticsFromMiddlePointTest_improved( void* band, QgsGeometry* poly, int pixelOffsetX, int pixelOffsetY, int nCellsX, int nCellsY, \
double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, double& sum, double& count );
/**Returns statistics with precise pixel - polygon intersection test (slow) */
void statisticsFromPreciseIntersection( void* band, QgsGeometry* poly, int pixelOffsetX, int pixelOffsetY, int nCellsX, int nCellsY, \
double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, double& sum, double& count );
QString mRasterFilePath;
/**Raster band to calculate statistics from (defaults to 1)*/
int mRasterBand;
QgsVectorLayer* mPolygonLayer;
QString mAttributePrefix;
/**The nodata value of the input layer*/
float mInputNodataValue;
};
#endif // QGSZONALSTATISTICS_H
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