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Use GDALAutoCreateWarpedVRT to handle south-up (or rotated) rasters a…
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…lso for calculator. Fixes bug #3281

git-svn-id: http://svn.osgeo.org/qgis/trunk@14842 c8812cc2-4d05-0410-92ff-de0c093fc19c
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mhugent committed Dec 5, 2010
1 parent cfefae1 commit 202ec2b
Showing 1 changed file with 57 additions and 36 deletions.
93 changes: 57 additions & 36 deletions src/analysis/raster/qgsrastercalculator.cpp
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Expand Up @@ -22,9 +22,11 @@
#include "cpl_string.h"
#include <QProgressDialog>

#include "gdalwarper.h"

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 )
mOutputRectangle( outputExtent ), mNumOutputColumns( nOutputColumns ), mNumOutputRows( nOutputRows ), mRasterEntries( rasterEntries )
{
}

Expand All @@ -37,7 +39,7 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
//prepare search string / tree
QString errorString;
QgsRasterCalcNode* calcNode = QgsRasterCalcNode::parseRasterCalcString( mFormulaString, errorString );
if( !calcNode )
if ( !calcNode )
{
//error
}
Expand All @@ -51,34 +53,53 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
QVector< GDALDatasetH > mInputDatasets; //raster references and corresponding dataset

QVector<QgsRasterCalculatorEntry>::const_iterator it = mRasterEntries.constBegin();
for( ; it != mRasterEntries.constEnd(); ++it )
for ( ; it != mRasterEntries.constEnd(); ++it )
{
if( !it->raster ) // no raster layer in entry
if ( !it->raster ) // no raster layer in entry
{
return 2;
}
GDALDatasetH inputDataset = GDALOpen( it->raster->source().toLocal8Bit().data(), GA_ReadOnly );
if( inputDataset == NULL )
if ( inputDataset == NULL )
{
return 2;
}

//check if the input dataset is south up or rotated. If yes, use GDALAutoCreateWarpedVRT to create a north up raster
double inputGeoTransform[6];
if ( GDALGetGeoTransform( inputDataset, inputGeoTransform ) == CE_None
&& ( inputGeoTransform[1] < 0.0
|| inputGeoTransform[2] != 0.0
|| inputGeoTransform[4] != 0.0
|| inputGeoTransform[5] > 0.0 ) )
{
GDALDatasetH vDataset = GDALAutoCreateWarpedVRT( inputDataset, NULL, NULL, GRA_NearestNeighbour, 0.2, NULL );
mInputDatasets.push_back( vDataset );
mInputDatasets.push_back( inputDataset );
inputDataset = vDataset;
}
else
{
mInputDatasets.push_back( inputDataset );
}


GDALRasterBandH inputRasterBand = GDALGetRasterBand( inputDataset, it->bandNumber );
if( inputRasterBand == NULL )
if ( inputRasterBand == NULL )
{
return 2;
}

int nodataSuccess;
double nodataValue = GDALGetRasterNoDataValue( inputRasterBand, &nodataSuccess );

mInputDatasets.push_back( inputDataset );
mInputRasterBands.insert( it->ref, inputRasterBand );
inputScanLineData.insert( it->ref, new QgsRasterMatrix( mNumOutputColumns, 1, new float[mNumOutputColumns], nodataValue ) );
}

//open output dataset for writing
GDALDriverH outputDriver = openOutputDriver();
if( outputDriver == NULL )
if ( outputDriver == NULL )
{
return 1;
}
Expand All @@ -90,29 +111,29 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )

float* resultScanLine = ( float * ) CPLMalloc( sizeof( float ) * mNumOutputColumns );

if( p )
if ( p )
{
p->setMaximum( mNumOutputRows );
}

QgsRasterMatrix resultMatrix;

//read / write line by line
for( int i = 0; i < mNumOutputRows; ++i )
for ( int i = 0; i < mNumOutputRows; ++i )
{
if( p )
if ( p )
{
p->setValue( i );
}

if( p && p->wasCanceled() )
if ( p && p->wasCanceled() )
{
break;
}

//fill buffers
QMap< QString, QgsRasterMatrix* >::iterator bufferIt = inputScanLineData.begin();
for( ; bufferIt != inputScanLineData.end(); ++bufferIt )
for ( ; bufferIt != inputScanLineData.end(); ++bufferIt )
{
double sourceTransformation[6];
GDALRasterBandH sourceRasterBand = mInputRasterBands[bufferIt.key()];
Expand All @@ -121,15 +142,15 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
readRasterPart( targetGeoTransform, 0, i, mNumOutputColumns, 1, sourceTransformation, sourceRasterBand, bufferIt.value()->data() );
}

if( calcNode->calculate( inputScanLineData, resultMatrix ) )
if ( calcNode->calculate( inputScanLineData, resultMatrix ) )
{
bool resultIsNumber = resultMatrix.isNumber();
float* calcData;

if( resultIsNumber ) //scalar result. Insert number for every pixel
if ( resultIsNumber ) //scalar result. Insert number for every pixel
{
calcData = new float[mNumOutputColumns];
for( int j = 0; j < mNumOutputColumns; ++j )
for ( int j = 0; j < mNumOutputColumns; ++j )
{
calcData[j] = resultMatrix.number();
}
Expand All @@ -140,49 +161,49 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
}

//replace all matrix nodata values with output nodatas
for( int j = 0; j < mNumOutputColumns; ++j )
for ( int j = 0; j < mNumOutputColumns; ++j )
{
if( calcData[j] == resultMatrix.nodataValue() )
if ( calcData[j] == resultMatrix.nodataValue() )
{
calcData[j] = outputNodataValue;
}
}

//write scanline to the dataset
if( GDALRasterIO( outputRasterBand, GF_Write, 0, i, mNumOutputColumns, 1, calcData, mNumOutputColumns, 1, GDT_Float32, 0, 0 ) != CE_None )
if ( GDALRasterIO( outputRasterBand, GF_Write, 0, i, mNumOutputColumns, 1, calcData, mNumOutputColumns, 1, GDT_Float32, 0, 0 ) != CE_None )
{
qWarning( "RasterIO error!" );
}

if( resultIsNumber )
if ( resultIsNumber )
{
delete[] calcData;
}
}

}

if( p )
if ( p )
{
p->setValue( mNumOutputRows );
}

//close datasets and release memory
delete calcNode;
QMap< QString, QgsRasterMatrix* >::iterator bufferIt = inputScanLineData.begin();
for( ; bufferIt != inputScanLineData.end(); ++bufferIt )
for ( ; bufferIt != inputScanLineData.end(); ++bufferIt )
{
delete bufferIt.value();
}
inputScanLineData.clear();

QVector< GDALDatasetH >::iterator datasetIt = mInputDatasets.begin();
for( ; datasetIt != mInputDatasets.end(); ++ datasetIt )
for ( ; datasetIt != mInputDatasets.end(); ++ datasetIt )
{
GDALClose( *datasetIt );
}

if( p && p->wasCanceled() )
if ( p && p->wasCanceled() )
{
//delete the dataset without closing (because it is faster)
GDALDeleteDataset( outputDriver, mOutputFile.toLocal8Bit().data() );
Expand All @@ -204,13 +225,13 @@ GDALDriverH QgsRasterCalculator::openOutputDriver()
//open driver
GDALDriverH outputDriver = GDALGetDriverByName( mOutputFormat.toLocal8Bit().data() );

if( outputDriver == NULL )
if ( outputDriver == NULL )
{
return outputDriver; //return NULL, driver does not exist
}

driverMetadata = GDALGetMetadata( outputDriver, NULL );
if( !CSLFetchBoolean( driverMetadata, GDAL_DCAP_CREATE, false ) )
if ( !CSLFetchBoolean( driverMetadata, GDAL_DCAP_CREATE, false ) )
{
return NULL; //driver exist, but it does not support the create operation
}
Expand All @@ -223,7 +244,7 @@ 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 )
if ( outputDataset == NULL )
{
return outputDataset;
}
Expand All @@ -239,7 +260,7 @@ GDALDatasetH QgsRasterCalculator::openOutputFile( GDALDriverH outputDriver )
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 ) )
if ( transformationsEqual( targetGeotransform, sourceTransform ) )
{
GDALRasterIO( sourceBand, GF_Read, xOffset, yOffset, nCols, nRows, rasterBuffer, nCols, nRows, GDT_Float32, 0, 0 );
return;
Expand All @@ -255,10 +276,10 @@ void QgsRasterCalculator::readRasterPart( double* targetGeotransform, int xOffse
QgsRectangle intersection = targetRect.intersect( &sourceRect );

//no intersection, fill all the pixels with nodata values
if( intersection.isEmpty() )
if ( intersection.isEmpty() )
{
int nPixels = nCols * nRows;
for( int i = 0; i < nPixels; ++i )
for ( int i = 0; i < nPixels; ++i )
{
rasterBuffer[i] = nodataValue;
}
Expand All @@ -284,17 +305,17 @@ void QgsRasterCalculator::readRasterPart( double* targetGeotransform, int xOffse
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 )
for ( int i = 0; i < nRows; ++i )
{
targetPixelX = targetPixelXMin;
for( int j = 0; j < nCols; ++j )
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 )
if ( sourceIndexX >= 0 && sourceIndexX < nSourcePixelsX
&& sourceIndexY >= 0 && sourceIndexY < nSourcePixelsY )
{
rasterBuffer[j + i*nRows] = sourceRaster[ sourceIndexX + nSourcePixelsX * sourceIndexY ];
}
Expand All @@ -313,9 +334,9 @@ void QgsRasterCalculator::readRasterPart( double* targetGeotransform, int xOffse

bool QgsRasterCalculator::transformationsEqual( double* t1, double* t2 ) const
{
for( int i = 0; i < 6; ++i )
for ( int i = 0; i < 6; ++i )
{
if( !doubleNear( t1[i], t2[i], 0.00001 ) )
if ( !doubleNear( t1[i], t2[i], 0.00001 ) )
{
return false;
}
Expand Down

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