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Add reclassify by table algorithm

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@nyalldawson
nyalldawson committed Jun 7, 2018
1 parent 3c8f80d commit f0f5211ff5e12d4c531d98c366ebfdba062e4d1a
2 src/analysis/CMakeLists.txt
View file
@@ -88,6 +88,7 @@ SET(QGIS_ANALYSIS_SRCS
processing/qgsnativealgorithms.cpp
processing/qgsoverlayutils.cpp
processing/qgsrasteranalysisutils.cpp
processing/qgsreclassifyutils.cpp

raster/qgsalignraster.cpp
raster/qgsninecellfilter.cpp
@@ -217,6 +218,7 @@ QT5_WRAP_CPP(QGIS_ANALYSIS_MOC_SRCS ${QGIS_ANALYSIS_MOC_HDRS})

SET(QGIS_ANALYSIS_HDRS
processing/qgsalgorithmimportphotos.h
processing/qgsreclassifyutils.h

raster/qgsalignraster.h
raster/qgsaspectfilter.h
239 src/analysis/processing/qgsalgorithmreclassifybylayer.cpp
View file
@@ -16,53 +16,35 @@
***************************************************************************/

#include "qgsalgorithmreclassifybylayer.h"
#include "qgsgeos.h"
#include "qgslogger.h"
#include "qgsrasterfilewriter.h"
#include "qgsreclassifyutils.h"
#include "qgis.h"

///@cond PRIVATE

QString QgsReclassifyByLayerAlgorithm::name() const
{
return QStringLiteral( "reclassifybylayer" );
}
//
// QgsReclassifyAlgorithmBase
//

QString QgsReclassifyByLayerAlgorithm::displayName() const
{
return QObject::tr( "Reclassify by layer" );
}

QStringList QgsReclassifyByLayerAlgorithm::tags() const
{
return QObject::tr( "raster,reclassify,classes,calculator" ).split( ',' );
}

QString QgsReclassifyByLayerAlgorithm::group() const
QString QgsReclassifyAlgorithmBase::group() const
{
return QObject::tr( "Raster analysis" );
}

QString QgsReclassifyByLayerAlgorithm::groupId() const
QString QgsReclassifyAlgorithmBase::groupId() const
{
return QStringLiteral( "rasteranalysis" );
}

void QgsReclassifyByLayerAlgorithm::initAlgorithm( const QVariantMap & )
void QgsReclassifyAlgorithmBase::initAlgorithm( const QVariantMap &configuration )
{
addParameter( new QgsProcessingParameterRasterLayer( QStringLiteral( "INPUT_RASTER" ),
QObject::tr( "Raster layer" ) ) );
addParameter( new QgsProcessingParameterBand( QStringLiteral( "RASTER_BAND" ),
QObject::tr( "Band number" ), 1, QStringLiteral( "INPUT_RASTER" ) ) );

addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT_TABLE" ),
QObject::tr( "Layer containing class breaks" ), QList< int >() << QgsProcessing::TypeVector ) );
addParameter( new QgsProcessingParameterField( QStringLiteral( "MIN_FIELD" ),
QObject::tr( "Minimum class value field" ), QVariant(), QStringLiteral( "INPUT_TABLE" ), QgsProcessingParameterField::Numeric ) );
addParameter( new QgsProcessingParameterField( QStringLiteral( "MAX_FIELD" ),
QObject::tr( "Maximum class value field" ), QVariant(), QStringLiteral( "INPUT_TABLE" ), QgsProcessingParameterField::Numeric ) );
addParameter( new QgsProcessingParameterField( QStringLiteral( "VALUE_FIELD" ),
QObject::tr( "Output value field" ), QVariant(), QStringLiteral( "INPUT_TABLE" ), QgsProcessingParameterField::Numeric ) );
addAlgorithmParams();

std::unique_ptr< QgsProcessingParameterNumber > noDataValueParam = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "NO_DATA" ),
QObject::tr( "Output no data value" ), QgsProcessingParameterNumber::Double, -9999 );
@@ -71,17 +53,7 @@ void QgsReclassifyByLayerAlgorithm::initAlgorithm( const QVariantMap & )
addParameter( new QgsProcessingParameterRasterDestination( QStringLiteral( "OUTPUT" ), QObject::tr( "Reclassified raster" ) ) );
}

QString QgsReclassifyByLayerAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm reclassifies a raster band by assigning new class values based on the ranges specified in a vector table." );
}

QgsReclassifyByLayerAlgorithm *QgsReclassifyByLayerAlgorithm::createInstance() const
{
return new QgsReclassifyByLayerAlgorithm();
}

bool QgsReclassifyByLayerAlgorithm::prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
bool QgsReclassifyAlgorithmBase::prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
QgsRasterLayer *layer = parameterAsRasterLayer( parameters, QStringLiteral( "INPUT_RASTER" ), context );
mBand = parameterAsInt( parameters, QStringLiteral( "RASTER_BAND" ), context );
@@ -99,6 +71,77 @@ bool QgsReclassifyByLayerAlgorithm::prepareAlgorithm( const QVariantMap &paramet

mNoDataValue = parameterAsDouble( parameters, QStringLiteral( "NO_DATA" ), context );

return _prepareAlgorithm( parameters, context, feedback );
}

QVariantMap QgsReclassifyAlgorithmBase::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
QVector< QgsReclassifyUtils::RasterClass > classes = createClasses( parameters, context, feedback );

const QString outputFile = parameterAsOutputLayer( parameters, QStringLiteral( "OUTPUT" ), context );
QFileInfo fi( outputFile );
const QString outputFormat = QgsRasterFileWriter::driverForExtension( fi.suffix() );

std::unique_ptr< QgsRasterFileWriter > writer = qgis::make_unique< QgsRasterFileWriter >( outputFile );
writer->setOutputProviderKey( QStringLiteral( "gdal" ) );
writer->setOutputFormat( outputFormat );
std::unique_ptr<QgsRasterDataProvider > provider( writer->createOneBandRaster( Qgis::Float32, mNbCellsXProvider, mNbCellsYProvider, mExtent, mCrs ) );
if ( !provider )
throw QgsProcessingException( QObject::tr( "Could not create raster output: %1" ).arg( outputFile ) );

provider->setNoDataValue( 1, mNoDataValue );

QgsReclassifyUtils::reclassify( classes, mInterface.get(), mBand, mExtent, mNbCellsXProvider, mNbCellsYProvider, provider.get(), mNoDataValue, feedback );

QVariantMap outputs;
outputs.insert( QStringLiteral( "OUTPUT" ), outputFile );
return outputs;
}


//
// QgsReclassifyByLayerAlgorithm
//

QString QgsReclassifyByLayerAlgorithm::name() const
{
return QStringLiteral( "reclassifybylayer" );
}

QString QgsReclassifyByLayerAlgorithm::displayName() const
{
return QObject::tr( "Reclassify by layer" );
}

QStringList QgsReclassifyByLayerAlgorithm::tags() const
{
return QObject::tr( "raster,reclassify,classes,calculator" ).split( ',' );
}

QString QgsReclassifyByLayerAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm reclassifies a raster band by assigning new class values based on the ranges specified in a vector table." );
}

QgsReclassifyByLayerAlgorithm *QgsReclassifyByLayerAlgorithm::createInstance() const
{
return new QgsReclassifyByLayerAlgorithm();
}

void QgsReclassifyByLayerAlgorithm::addAlgorithmParams()
{
addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT_TABLE" ),
QObject::tr( "Layer containing class breaks" ), QList< int >() << QgsProcessing::TypeVector ) );
addParameter( new QgsProcessingParameterField( QStringLiteral( "MIN_FIELD" ),
QObject::tr( "Minimum class value field" ), QVariant(), QStringLiteral( "INPUT_TABLE" ), QgsProcessingParameterField::Numeric ) );
addParameter( new QgsProcessingParameterField( QStringLiteral( "MAX_FIELD" ),
QObject::tr( "Maximum class value field" ), QVariant(), QStringLiteral( "INPUT_TABLE" ), QgsProcessingParameterField::Numeric ) );
addParameter( new QgsProcessingParameterField( QStringLiteral( "VALUE_FIELD" ),
QObject::tr( "Output value field" ), QVariant(), QStringLiteral( "INPUT_TABLE" ), QgsProcessingParameterField::Numeric ) );
}

bool QgsReclassifyByLayerAlgorithm::_prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
{
std::unique_ptr< QgsFeatureSource >tableSource( parameterAsSource( parameters, QStringLiteral( "INPUT_TABLE" ), context ) );
if ( !tableSource )
throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "INPUT_TABLE" ) ) );
@@ -124,10 +167,9 @@ bool QgsReclassifyByLayerAlgorithm::prepareAlgorithm( const QVariantMap &paramet
return true;
}

QVariantMap QgsReclassifyByLayerAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
QVector<QgsReclassifyUtils::RasterClass> QgsReclassifyByLayerAlgorithm::createClasses( const QVariantMap &, QgsProcessingContext &, QgsProcessingFeedback * )
{
// step 1 - build up the table of reclassification values
QVector< Class > classes;
QVector< QgsReclassifyUtils::RasterClass > classes;
QgsFeature f;
while ( mTableIterator.nextFeature( f ) )
{
@@ -142,89 +184,78 @@ QVariantMap QgsReclassifyByLayerAlgorithm::processAlgorithm( const QVariantMap &
if ( !ok )
throw QgsProcessingException( QObject::tr( "Invalid output value: %1" ).arg( f.attribute( mValueFieldIdx ).toString() ) );

classes << Class( minValue, maxValue, value );
classes << QgsReclassifyUtils::RasterClass( minValue, maxValue, QgsRasterRange::IncludeMax, value );
}
return classes;
}

const QString outputFile = parameterAsOutputLayer( parameters, QStringLiteral( "OUTPUT" ), context );
QFileInfo fi( outputFile );
const QString outputFormat = QgsRasterFileWriter::driverForExtension( fi.suffix() );

std::unique_ptr< QgsRasterFileWriter > writer = qgis::make_unique< QgsRasterFileWriter >( outputFile );
writer->setOutputProviderKey( QStringLiteral( "gdal" ) );
writer->setOutputFormat( outputFormat );
std::unique_ptr<QgsRasterDataProvider > provider( writer->createOneBandRaster( Qgis::Float32, mNbCellsXProvider, mNbCellsYProvider, mExtent, mCrs ) );
if ( !provider )
throw QgsProcessingException( QObject::tr( "Could not create raster output: %1" ).arg( outputFile ) );
//
// QgsReclassifyByTableAlgorithm
//

provider->setNoDataValue( 1, mNoDataValue );
QString QgsReclassifyByTableAlgorithm::name() const
{
return QStringLiteral( "reclassifybytable" );
}

reclassify( classes, provider.get(), feedback );
QString QgsReclassifyByTableAlgorithm::displayName() const
{
return QObject::tr( "Reclassify by table" );
}

QVariantMap outputs;
outputs.insert( QStringLiteral( "OUTPUT" ), outputFile );
return outputs;
QStringList QgsReclassifyByTableAlgorithm::tags() const
{
return QObject::tr( "raster,reclassify,classes,calculator" ).split( ',' );
}

void QgsReclassifyByLayerAlgorithm::reclassify( const QVector<QgsReclassifyByLayerAlgorithm::Class> &classes, QgsRasterDataProvider *destinationRaster, QgsProcessingFeedback *feedback )
QString QgsReclassifyByTableAlgorithm::shortHelpString() const
{
int maxWidth = 4000;
int maxHeight = 4000;
return QObject::tr( "This algorithm reclassifies a raster band by assigning new class values based on the ranges specified in a fixed table." );
}

QgsRasterIterator iter( mInterface.get() );
iter.setMaximumTileWidth( maxWidth );
iter.setMaximumTileHeight( maxHeight );
iter.startRasterRead( mBand, mNbCellsXProvider, mNbCellsYProvider, mExtent );
QgsReclassifyByTableAlgorithm *QgsReclassifyByTableAlgorithm::createInstance() const
{
return new QgsReclassifyByTableAlgorithm();
}

int nbBlocksWidth = std::ceil( 1.0 * mNbCellsXProvider / maxWidth );
int nbBlocksHeight = std::ceil( 1.0 * mNbCellsYProvider / maxHeight );
int nbBlocks = nbBlocksWidth * nbBlocksHeight;
void QgsReclassifyByTableAlgorithm::addAlgorithmParams()
{
addParameter( new QgsProcessingParameterMatrix( QStringLiteral( "TABLE" ),
QObject::tr( "Reclassification table" ),
1, false, QStringList() << QObject::tr( "Minimum" )
<< QObject::tr( "Maximum" )
<< QObject::tr( "Value" ) ) );
}

int iterLeft = 0;
int iterTop = 0;
int iterCols = 0;
int iterRows = 0;
destinationRaster->setEditable( true );
QgsRasterBlock *rasterBlock = nullptr;
while ( iter.readNextRasterPart( mBand, iterCols, iterRows, &rasterBlock, iterLeft, iterTop ) )
{
feedback->setProgress( 100 * ( ( iterTop / maxHeight * nbBlocksWidth ) + iterLeft / maxWidth ) / nbBlocks );
std::unique_ptr< QgsRasterBlock > reclassifiedBlock = qgis::make_unique< QgsRasterBlock >( Qgis::Float32, iterCols, iterRows );

for ( int row = 0; row < iterRows; row++ )
{
if ( feedback->isCanceled() )
break;
for ( int column = 0; column < iterCols; column++ )
{
if ( rasterBlock->isNoData( row, column ) )
reclassifiedBlock->setValue( row, column, mNoDataValue );
else
{
double value = rasterBlock->value( row, column );
double newValue = reclassifyValue( classes, value );
reclassifiedBlock->setValue( row, column, newValue );
}
}
}
destinationRaster->writeBlock( reclassifiedBlock.get(), 1, iterLeft, iterTop );

delete rasterBlock;
}
destinationRaster->setEditable( false );
bool QgsReclassifyByTableAlgorithm::_prepareAlgorithm( const QVariantMap &, QgsProcessingContext &, QgsProcessingFeedback * )
{
return true;
}

double QgsReclassifyByLayerAlgorithm::reclassifyValue( const QVector<QgsReclassifyByLayerAlgorithm::Class> &classes, double input ) const
QVector<QgsReclassifyUtils::RasterClass> QgsReclassifyByTableAlgorithm::createClasses( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
{
for ( const QgsReclassifyByLayerAlgorithm::Class &c : classes )
const QVariantList table = parameterAsMatrix( parameters, QStringLiteral( "TABLE" ), context );
int rows = table.count() / 3;
QVector< QgsReclassifyUtils::RasterClass > classes;
for ( int row = 0; row < rows; ++row )
{
if ( input >= c.range.min() && input < c.range.max() )
return c.value;
}
return mNoDataValue;
bool ok = false;
const double minValue = table.at( row * 3 ).toDouble( &ok );
if ( !ok )
throw QgsProcessingException( QObject::tr( "Invalid value for minimum: %1" ).arg( table.at( row * 3 ).toString() ) );
const double maxValue = table.at( row * 3 + 1 ).toDouble( &ok );
if ( !ok )
throw QgsProcessingException( QObject::tr( "Invalid value for maximum: %1" ).arg( table.at( row * 3 + 1 ).toString() ) );
const double value = table.at( row * 3 + 2 ).toDouble( &ok );
if ( !ok )
throw QgsProcessingException( QObject::tr( "Invalid output value: %1" ).arg( table.at( row * 3 + 2 ).toString() ) );

classes << QgsReclassifyUtils::RasterClass( minValue, maxValue, QgsRasterRange::IncludeMax, value );
}
return classes;
}

///@endcond



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