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qgsrastercalculator.cpp
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qgsrastercalculator.cpp
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/***************************************************************************
qgsrastercalculator.cpp - description
-----------------------
begin : September 28th, 2010
copyright : (C) 2010 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "qgsrastercalculator.h"
#include "qgsrastercalcnode.h"
#include "qgsrasterlayer.h"
#include "qgsrastermatrix.h"
#include "cpl_string.h"
#include <QProgressDialog>
QgsRasterCalculator::QgsRasterCalculator( const QString& formulaString, const QString& outputFile, const QString& outputFormat,
const QgsRectangle& outputExtent, int nOutputColumns, int nOutputRows, const QVector<QgsRasterCalculatorEntry>& rasterEntries ): mFormulaString( formulaString ), mOutputFile( outputFile ), mOutputFormat( outputFormat ),
mOutputRectangle( outputExtent ), mNumOutputColumns( nOutputColumns ), mNumOutputRows( nOutputRows ), mRasterEntries( rasterEntries )
{
}
QgsRasterCalculator::~QgsRasterCalculator()
{
}
int QgsRasterCalculator::processCalculation( QProgressDialog* p )
{
//prepare search string / tree
QString errorString;
QgsRasterCalcNode* calcNode = QgsRasterCalcNode::parseRasterCalcString( mFormulaString, errorString );
if ( !calcNode )
{
//error
}
double targetGeoTransform[6];
outputGeoTransform( targetGeoTransform );
//open all input rasters for reading
QMap< QString, GDALRasterBandH > mInputRasterBands; //raster references and corresponding scanline data
QMap< QString, QgsRasterMatrix* > inputScanLineData; //stores raster references and corresponding scanline data
QVector< GDALDatasetH > mInputDatasets; //raster references and corresponding dataset
QVector<QgsRasterCalculatorEntry>::const_iterator it = mRasterEntries.constBegin();
for ( ; it != mRasterEntries.constEnd(); ++it )
{
if ( !it->raster ) // no raster layer in entry
{
return 2;
}
GDALDatasetH inputDataset = GDALOpen( it->raster->source().toLocal8Bit().data(), GA_ReadOnly );
if ( inputDataset == NULL )
{
return 2;
}
GDALRasterBandH inputRasterBand = GDALGetRasterBand( inputDataset, it->bandNumber );
if ( inputRasterBand == NULL )
{
return 2;
}
mInputDatasets.push_back( inputDataset );
mInputRasterBands.insert( it->ref, inputRasterBand );
inputScanLineData.insert( it->ref, new QgsRasterMatrix( mNumOutputColumns, 1, new float[mNumOutputColumns] ) );
}
//open output dataset for writing
GDALDriverH outputDriver = openOutputDriver();
if ( outputDriver == NULL )
{
return 1;
}
GDALDatasetH outputDataset = openOutputFile( outputDriver );
GDALRasterBandH outputRasterBand = GDALGetRasterBand( outputDataset, 1 );
float* resultScanLine = ( float * ) CPLMalloc( sizeof( float ) * mNumOutputColumns );
if ( p )
{
p->setMaximum( mNumOutputRows );
}
QgsRasterMatrix resultMatrix;
//read / write line by line
for ( int i = 0; i < mNumOutputRows; ++i )
{
if ( p )
{
p->setValue( i );
}
if ( p && p->wasCanceled() )
{
break;
}
//fill buffers
QMap< QString, QgsRasterMatrix* >::iterator bufferIt = inputScanLineData.begin();
for ( ; bufferIt != inputScanLineData.end(); ++bufferIt )
{
double sourceTransformation[6];
GDALRasterBandH sourceRasterBand = mInputRasterBands[bufferIt.key()];
GDALGetGeoTransform( GDALGetBandDataset( sourceRasterBand ), sourceTransformation );
//the function readRasterPart calls GDALRasterIO (and ev. does some conversion if raster transformations are not the same)
readRasterPart( targetGeoTransform, 0, i, mNumOutputColumns, 1, sourceTransformation, sourceRasterBand, bufferIt.value()->data() );
}
if ( calcNode->calculate( inputScanLineData, resultMatrix ) )
{
//write scanline to the dataset
if ( GDALRasterIO( outputRasterBand, GF_Write, 0, i, mNumOutputColumns, 1, resultMatrix.data(), mNumOutputColumns, 1, GDT_Float32, 0, 0 ) != CE_None )
{
qWarning( "RasterIO error!" );
}
}
}
if ( p )
{
p->setValue( mNumOutputRows );
}
//close datasets and release memory
delete calcNode;
QMap< QString, QgsRasterMatrix* >::iterator bufferIt = inputScanLineData.begin();
for ( ; bufferIt != inputScanLineData.end(); ++bufferIt )
{
delete bufferIt.value();
}
inputScanLineData.clear();
QVector< GDALDatasetH >::iterator datasetIt = mInputDatasets.begin();
for ( ; datasetIt != mInputDatasets.end(); ++ datasetIt )
{
GDALClose( *datasetIt );
}
if ( p && p->wasCanceled() )
{
//delete the dataset without closing (because it is faster)
GDALDeleteDataset( outputDriver, mOutputFile.toLocal8Bit().data() );
return 3;
}
GDALClose( outputDataset );
CPLFree( resultScanLine );
return 0;
}
QgsRasterCalculator::QgsRasterCalculator()
{
}
GDALDriverH QgsRasterCalculator::openOutputDriver()
{
char **driverMetadata;
//open driver
GDALDriverH outputDriver = GDALGetDriverByName( mOutputFormat.toLocal8Bit().data() );
if ( outputDriver == NULL )
{
return outputDriver; //return NULL, driver does not exist
}
driverMetadata = GDALGetMetadata( outputDriver, NULL );
if ( !CSLFetchBoolean( driverMetadata, GDAL_DCAP_CREATE, false ) )
{
return NULL; //driver exist, but it does not support the create operation
}
return outputDriver;
}
GDALDatasetH QgsRasterCalculator::openOutputFile( GDALDriverH outputDriver )
{
//open output file
char **papszOptions = NULL;
GDALDatasetH outputDataset = GDALCreate( outputDriver, mOutputFile.toLocal8Bit().data(), mNumOutputColumns, mNumOutputRows, 1, GDT_Float32, papszOptions );
if ( outputDataset == NULL )
{
return outputDataset;
}
//assign georef information
double geotransform[6];
outputGeoTransform( geotransform );
GDALSetGeoTransform( outputDataset, geotransform );
return outputDataset;
}
void QgsRasterCalculator::readRasterPart( double* targetGeotransform, int xOffset, int yOffset, int nCols, int nRows, double* sourceTransform, GDALRasterBandH sourceBand, float* rasterBuffer )
{
//If dataset transform is the same as the requested transform, do a normal GDAL raster io
if ( transformationsEqual( targetGeotransform, sourceTransform ) )
{
GDALRasterIO( sourceBand, GF_Read, xOffset, yOffset, nCols, nRows, rasterBuffer, nCols, nRows, GDT_Float32, 0, 0 );
return;
}
//pixel calculation needed because of different raster position / resolution
int nodataSuccess;
double nodataValue = GDALGetRasterNoDataValue( sourceBand, &nodataSuccess );
QgsRectangle targetRect( targetGeotransform[0] + targetGeotransform[1] * xOffset, targetGeotransform[3] + yOffset * targetGeotransform[5] + nRows * targetGeotransform[5]
, targetGeotransform[0] + targetGeotransform[1] * xOffset + targetGeotransform[1] * nCols, targetGeotransform[3] + yOffset * targetGeotransform[5] );
QgsRectangle sourceRect( sourceTransform[0], sourceTransform[3] + GDALGetRasterBandXSize( sourceBand ) * sourceTransform[5], sourceTransform[0] + GDALGetRasterBandXSize( sourceBand )* sourceTransform[1], sourceTransform[3] );
QgsRectangle intersection = targetRect.intersect( &sourceRect );
//no intersection, fill all the pixels with nodata values
if ( intersection.isEmpty() )
{
int nPixels = nCols * nRows;
for ( int i = 0; i < nPixels; ++i )
{
rasterBuffer[i] = nodataValue;
}
return;
}
//do raster io in source resolution
int sourcePixelOffsetXMin = floor(( intersection.xMinimum() - sourceTransform[0] ) / sourceTransform[1] );
int sourcePixelOffsetXMax = ceil(( intersection.xMaximum() - sourceTransform[0] ) / sourceTransform[1] );
int nSourcePixelsX = sourcePixelOffsetXMax - sourcePixelOffsetXMin;
int sourcePixelOffsetYMax = floor(( intersection.yMaximum() - sourceTransform[3] ) / sourceTransform[5] );
int sourcePixelOffsetYMin = ceil(( intersection.yMinimum() - sourceTransform[3] ) / sourceTransform[5] );
int nSourcePixelsY = sourcePixelOffsetYMin - sourcePixelOffsetYMax;
float* sourceRaster = ( float * ) CPLMalloc( sizeof( float ) * nSourcePixelsX * nSourcePixelsY );
double sourceRasterXMin = sourceRect.xMinimum() + sourcePixelOffsetXMin * sourceTransform[1];
double sourceRasterYMax = sourceRect.yMaximum() + sourcePixelOffsetYMax * sourceTransform[5];
GDALRasterIO( sourceBand, GF_Read, sourcePixelOffsetXMin, sourcePixelOffsetYMax, nSourcePixelsX, nSourcePixelsY,
sourceRaster, nSourcePixelsX, nSourcePixelsY, GDT_Float32, 0, 0 );
double targetPixelX;
double targetPixelXMin = targetGeotransform[0] + targetGeotransform[1] * xOffset + targetGeotransform[1] / 2.0;
double targetPixelY = targetGeotransform[3] + targetGeotransform[5] * yOffset + targetGeotransform[5] / 2.0; //coordinates of current target pixel
int sourceIndexX, sourceIndexY; //current raster index in source pixels
double sx, sy;
for ( int i = 0; i < nRows; ++i )
{
targetPixelX = targetPixelXMin;
for ( int j = 0; j < nCols; ++j )
{
sx = ( targetPixelX - sourceRasterXMin ) / sourceTransform[1];
sourceIndexX = sx > 0 ? sx : floor( sx );
sy = ( targetPixelY - sourceRasterYMax ) / sourceTransform[5];
sourceIndexY = sy > 0 ? sy : floor( sy );
if ( sourceIndexX >= 0 && sourceIndexX < nSourcePixelsX
&& sourceIndexY >= 0 && sourceIndexY < nSourcePixelsY )
{
rasterBuffer[j + i*nRows] = sourceRaster[ sourceIndexX + nSourcePixelsX * sourceIndexY ];
}
else
{
rasterBuffer[j + i*j] = nodataValue;
}
targetPixelX += targetGeotransform[1];
}
targetPixelY += targetGeotransform[5];
}
CPLFree( sourceRaster );
return;
#if 0
//If dataset transform is the same as the requested transform, do a normal GDAL raster io
if ( transformationsEqual( targetGeotransform, sourceTransform ) )
{
GDALRasterIO( sourceBand, GF_Read, xOffset, yOffset, nCols, nRows, rasterBuffer, nCols, nRows, GDT_Float32, 0, 0 );
return;
}
//pixel calculation needed because of different raster position / resolution
//calculate raster span in source layer to fetch (which is a bit larger than the target area to fetch if the two resolutions don't match)
//calculate offset
//QgsRectangle targetRect( targetGeotransform[0], targetGeotransform[3] + mNumOutputColumns * targetGeotransform[5], targetGeotransform[0] + mNumOutputRows * targetGeotransform[1], targetGeotransform[3]);
QgsRectangle targetRect( targetGeotransform[0] + targetGeotransform[1] * xOffset, targetGeotransform[3] + yOffset * targetGeotransform[5] + nRows * targetGeotransform[5]
, targetGeotransform[0] + targetGeotransform[1] * xOffset + targetGeotransform[1] * nCols, targetGeotransform[3] + yOffset * targetGeotransform[5] );
QgsRectangle sourceRect( sourceTransform[0], sourceTransform[3] + GDALGetRasterBandXSize( sourceBand ) * sourceTransform[5], sourceTransform[0] + GDALGetRasterBandYSize( sourceBand )* sourceTransform[1], sourceTransform[3] );
QgsRectangle intersection = targetRect.intersect( &sourceRect );
//no intersection, fill all the pixels with nodata values
if ( intersection.isEmpty() )
{
int nPixels = nCols * nRows;
for ( int i = 0; i < nPixels; ++i )
{
rasterBuffer[i] = 0;
}
return;
}
//do raster io in source resolution
int sourcePixelOffsetX = ( intersection.xMinimum() - sourceTransform[0] ) / sourceTransform[1];
int sourcePixelOffsetY = ( intersection.yMaximum() - sourceTransform[3] ) / sourceTransform[5];
int nSourcePixelsX = ceil( fabs( intersection.width() / sourceTransform[1] ) );
int nSourcePixelsY = ceil( fabs( intersection.height() / sourceTransform[5] ) );
float* sourceRaster = ( float * ) CPLMalloc( sizeof( float ) * nSourcePixelsX * nSourcePixelsY );
double sourceRasterXMin = sourceRect.xMinimum() + sourcePixelOffsetX * sourceTransform[1];
double sourceRasterYMax = sourceRect.yMaximum() + sourcePixelOffsetY * sourceTransform[5];
GDALRasterIO( sourceBand, GF_Read, sourcePixelOffsetX, sourcePixelOffsetY, nSourcePixelsX, nSourcePixelsY,
sourceRaster, nSourcePixelsX, nSourcePixelsY, GDT_Float32, 0, 0 );
double targetPixelX;
double targetPixelXMin = targetGeotransform[0] + targetGeotransform[1] * xOffset + targetGeotransform[1] / 2.0;
double targetPixelY = targetGeotransform[3] + targetGeotransform[5] * yOffset + targetGeotransform[5] / 2.0; //coordinates of current target pixel
int sourceIndexX, sourceIndexY; //current raster index in source pixels
for ( int i = 0; i < nRows; ++i )
{
targetPixelX = targetPixelXMin;
for ( int j = 0; j < nCols; ++j )
{
sourceIndexX = ( targetPixelX - sourceRasterXMin ) / sourceTransform[1];
sourceIndexY = ( targetPixelY - sourceRasterYMax ) / sourceTransform[5];
if ( sourceIndexX >= 0 && sourceIndexX < nSourcePixelsX
&& sourceIndexY >= 0 && sourceIndexY < nSourcePixelsY )
{
rasterBuffer[j + i*nCols] = sourceRaster[ sourceIndexX + nSourcePixelsX * sourceIndexY ];
}
else
{
rasterBuffer[j + i*nCols] = 0; //todo: insert null value of rasterband here
}
targetPixelX += targetGeotransform[1];
}
targetPixelY += targetGeotransform[5];
}
CPLFree( sourceRaster );
return;
#endif //0
}
bool QgsRasterCalculator::transformationsEqual( double* t1, double* t2 ) const
{
for ( int i = 0; i < 6; ++i )
{
if ( !doubleNear( t1[i], t2[i] ) )
{
return false;
}
}
return true;
}
void QgsRasterCalculator::outputGeoTransform( double* transform ) const
{
transform[0] = mOutputRectangle.xMinimum();
transform[1] = mOutputRectangle.width() / mNumOutputColumns;
transform[2] = 0;
transform[3] = mOutputRectangle.yMaximum();
transform[4] = 0;
transform[5] = -mOutputRectangle.height() / mNumOutputRows;
}