void ECWThread::run()
{
try{
GDALDataset *poSrcDS = (GDALDataset *)GDALOpen(TO8F(inputPath),GA_ReadOnly);
if (poSrcDS==NULL)
throw tr("Open input file failed!");
if (poSrcDS->GetRasterBand(1)->GetRasterDataType()!=GDT_Byte)
throw tr("Data type of input file is not byte!");
GDALDriver *poDriver = GetGDALDriverManager()->GetDriverByName("JP2ECW");
if (poDriver == NULL)
throw tr("Data driver of ECW not found!");
char **papszOptions = NULL;
papszOptions = CSLSetNameValue( papszOptions, "LARGE_OK", "YES" );
// papszOptions = CSLSetNameValue( papszOptions, "TARGET", "0" );
GDALDataset *poDstDS = poDriver->CreateCopy(TO8F(outputPath),poSrcDS,NULL,papszOptions,progress,this);
if (poDstDS==NULL)
throw tr("Generate ecw file failed!");
GDALClose(poSrcDS);
GDALClose(poDstDS);
updateProgressBar(100);
}
catch (const QString &msg)
{
qDebug()<<msg;
}
}
bool QgsOgrLayerItem::setCrs( QgsCoordinateReferenceSystem crs )
{
QgsDebugMsg( "mPath = " + mPath );
OGRRegisterAll();
OGRSFDriverH hDriver;
OGRDataSourceH hDataSource = OGROpen( TO8F( mPath ), true, &hDriver );
if ( !hDataSource )
return false;
QString driverName = OGR_Dr_GetName( hDriver );
OGR_DS_Destroy( hDataSource );
// we are able to assign CRS only to shapefiles :-(
if ( driverName == "ESRI Shapefile" )
{
QString layerName = mPath.left( mPath.indexOf( ".shp", Qt::CaseInsensitive ) );
QString wkt = crs.toWkt();
// save ordinary .prj file
OGRSpatialReferenceH hSRS = OSRNewSpatialReference( wkt.toLocal8Bit().data() );
OSRMorphToESRI( hSRS ); // this is the important stuff for shapefile .prj
char* pszOutWkt = NULL;
OSRExportToWkt( hSRS, &pszOutWkt );
QFile prjFile( layerName + ".prj" );
if ( prjFile.open( QIODevice::WriteOnly ) )
{
QTextStream prjStream( &prjFile );
prjStream << pszOutWkt << endl;
prjFile.close();
}
else
{
QgsMessageLog::logMessage( tr( "Couldn't open file %1.prj" ).arg( layerName ), tr( "OGR" ) );
return false;
}
OSRDestroySpatialReference( hSRS );
CPLFree( pszOutWkt );
// save qgis-specific .qpj file (maybe because of better wkt compatibility?)
QFile qpjFile( layerName + ".qpj" );
if ( qpjFile.open( QIODevice::WriteOnly ) )
{
QTextStream qpjStream( &qpjFile );
qpjStream << wkt.toLocal8Bit().data() << endl;
qpjFile.close();
}
else
{
QgsMessageLog::logMessage( tr( "Couldn't open file %1.qpj" ).arg( layerName ), tr( "OGR" ) );
return false;
}
return true;
}
// It it is impossible to assign a crs to an existing layer
// No OGR_L_SetSpatialRef : http://trac.osgeo.org/gdal/ticket/4032
return false;
}
QgsShapeFile::QgsShapeFile( QString name, QString encoding )
{
fileName = name;
features = 0;
QgsApplication::registerOgrDrivers();
QSettings settings;
CPLSetConfigOption( "SHAPE_ENCODING", settings.value( "/qgis/ignoreShapeEncoding", true ).toBool() ? "" : 0 );
ogrDataSource = OGROpen( TO8F( fileName ), false, NULL );
if ( ogrDataSource != NULL )
{
valid = true;
ogrLayer = OGR_DS_GetLayer( ogrDataSource, 0 );
features = OGR_L_GetFeatureCount( ogrLayer, true );
}
else
valid = false;
setDefaultTable();
// init the geometry types
geometries << "NULL" << "POINT" << "LINESTRING" << "POLYGON" << "MULTIPOINT"
<< "MULTILINESTRING" << "MULTIPOLYGON" << "GEOMETRYCOLLECTION";
codec = QTextCodec::codecForName( encoding.toLocal8Bit().constData() );
if ( !codec )
codec = QTextCodec::codecForLocale();
Q_ASSERT( codec );
}
bool QgsImageWarper::openSrcDSAndGetWarpOpt( const QString &input, const ResamplingMethod &resampling,
const GDALTransformerFunc &pfnTransform,
GDALDatasetH &hSrcDS, GDALWarpOptions *&psWarpOptions )
{
// Open input file
GDALAllRegister();
hSrcDS = GDALOpen( TO8F( input ), GA_ReadOnly );
if ( !hSrcDS )
return false;
// Setup warp options.
psWarpOptions = GDALCreateWarpOptions();
psWarpOptions->hSrcDS = hSrcDS;
psWarpOptions->nBandCount = GDALGetRasterCount( hSrcDS );
psWarpOptions->panSrcBands =
( int * ) CPLMalloc( sizeof( int ) * psWarpOptions->nBandCount );
psWarpOptions->panDstBands =
( int * ) CPLMalloc( sizeof( int ) * psWarpOptions->nBandCount );
for ( int i = 0; i < psWarpOptions->nBandCount; ++i )
{
psWarpOptions->panSrcBands[i] = i + 1;
psWarpOptions->panDstBands[i] = i + 1;
}
psWarpOptions->pfnProgress = GDALTermProgress;
psWarpOptions->pfnTransformer = pfnTransform;
psWarpOptions->eResampleAlg = GDALResampleAlg( resampling );
return true;
}
QgsOgrFeatureIterator::QgsOgrFeatureIterator( QgsOgrFeatureSource* source, bool ownSource, const QgsFeatureRequest& request )
: QgsAbstractFeatureIteratorFromSource<QgsOgrFeatureSource>( source, ownSource, request )
, ogrDataSource( 0 )
, ogrLayer( 0 )
, mSubsetStringSet( false )
, mGeometrySimplifier( NULL )
{
mFeatureFetched = false;
ogrDataSource = OGROpen( TO8F( mSource->mFilePath ), false, NULL );
if ( mSource->mLayerName.isNull() )
{
ogrLayer = OGR_DS_GetLayer( ogrDataSource, mSource->mLayerIndex );
}
else
{
ogrLayer = OGR_DS_GetLayerByName( ogrDataSource, TO8( mSource->mLayerName ) );
}
if ( !mSource->mSubsetString.isEmpty() )
{
ogrLayer = QgsOgrUtils::setSubsetString( ogrLayer, ogrDataSource, mSource->mEncoding, mSource->mSubsetString );
mSubsetStringSet = true;
}
mFetchGeometry = ( mRequest.filterType() == QgsFeatureRequest::FilterRect ) || !( mRequest.flags() & QgsFeatureRequest::NoGeometry );
QgsAttributeList attrs = ( mRequest.flags() & QgsFeatureRequest::SubsetOfAttributes ) ? mRequest.subsetOfAttributes() : mSource->mFields.allAttributesList();
// make sure we fetch just relevant fields
// unless it's a VRT data source filtered by geometry as we don't know which
// attributes make up the geometry and OGR won't fetch them to evaluate the
// filter if we choose to ignore them (fixes #11223)
if (( mSource->mDriverName != "VRT" && mSource->mDriverName != "OGR_VRT" ) || mRequest.filterType() != QgsFeatureRequest::FilterRect )
{
QgsOgrUtils::setRelevantFields( ogrLayer, mSource->mFields.count(), mFetchGeometry, attrs );
}
// spatial query to select features
if ( mRequest.filterType() == QgsFeatureRequest::FilterRect )
{
OGRGeometryH filter = 0;
QString wktExtent = QString( "POLYGON((%1))" ).arg( mRequest.filterRect().asPolygon() );
QByteArray ba = wktExtent.toAscii();
const char *wktText = ba;
OGR_G_CreateFromWkt(( char ** )&wktText, NULL, &filter );
QgsDebugMsg( "Setting spatial filter using " + wktExtent );
OGR_L_SetSpatialFilter( ogrLayer, filter );
OGR_G_DestroyGeometry( filter );
}
else
{
OGR_L_SetSpatialFilter( ogrLayer, 0 );
}
//start with first feature
rewind();
}
QgsLayerItem::Capability QgsGdalLayerItem::capabilities()
{
// Check if data source can be opened for update
QgsDebugMsg( "mPath = " + mPath );
GDALAllRegister();
GDALDatasetH hDS = GDALOpen( TO8F( mPath ), GA_Update );
if ( !hDS )
return NoCapabilities;
return SetCrs;
}
QgsOgrFeatureIterator::QgsOgrFeatureIterator( QgsOgrProvider* p, const QgsFeatureRequest& request )
: QgsAbstractFeatureIterator( request )
, P( p )
, ogrDataSource( 0 )
, ogrLayer( 0 )
, mSubsetStringSet( false )
, mGeometrySimplifier( NULL )
{
mFeatureFetched = false;
ogrDataSource = OGROpen( TO8F( P->filePath() ), false, NULL );
if ( P->layerName().isNull() )
{
ogrLayer = OGR_DS_GetLayer( ogrDataSource, P->layerIndex() );
}
else
{
ogrLayer = OGR_DS_GetLayerByName( ogrDataSource, TO8( p->layerName() ) );
}
if ( !P->subsetString().isEmpty() )
{
ogrLayer = P->setSubsetString( ogrLayer, ogrDataSource );
mSubsetStringSet = true;
}
ensureRelevantFields();
// spatial query to select features
if ( mRequest.filterType() == QgsFeatureRequest::FilterRect )
{
OGRGeometryH filter = 0;
QString wktExtent = QString( "POLYGON((%1))" ).arg( mRequest.filterRect().asPolygon() );
QByteArray ba = wktExtent.toAscii();
const char *wktText = ba;
OGR_G_CreateFromWkt(( char ** )&wktText, NULL, &filter );
QgsDebugMsg( "Setting spatial filter using " + wktExtent );
OGR_L_SetSpatialFilter( ogrLayer, filter );
OGR_G_DestroyGeometry( filter );
}
else
{
OGR_L_SetSpatialFilter( ogrLayer, 0 );
}
//start with first feature
rewind();
}
GDALDatasetH QgsRelief::openOutputFile( GDALDatasetH inputDataset, GDALDriverH outputDriver )
{
if ( inputDataset == NULL )
{
return NULL;
}
int xSize = GDALGetRasterXSize( inputDataset );
int ySize = GDALGetRasterYSize( inputDataset );;
//open output file
char **papszOptions = NULL;
//use PACKBITS compression for tiffs by default
papszOptions = CSLSetNameValue( papszOptions, "COMPRESS", "PACKBITS" );
//create three band raster (reg, green, blue)
GDALDatasetH outputDataset = GDALCreate( outputDriver, TO8F( mOutputFile ), xSize, ySize, 3, GDT_Byte, papszOptions );
if ( outputDataset == NULL )
{
return outputDataset;
}
//get geotransform from inputDataset
double geotransform[6];
if ( GDALGetGeoTransform( inputDataset, geotransform ) != CE_None )
{
GDALClose( outputDataset );
return NULL;
}
GDALSetGeoTransform( outputDataset, geotransform );
//make sure mCellSizeX and mCellSizeY are always > 0
mCellSizeX = geotransform[1];
if ( mCellSizeX < 0 )
{
mCellSizeX = -mCellSizeX;
}
mCellSizeY = geotransform[5];
if ( mCellSizeY < 0 )
{
mCellSizeY = -mCellSizeY;
}
const char* projection = GDALGetProjectionRef( inputDataset );
GDALSetProjection( outputDataset, projection );
return outputDataset;
}
//duplicated from QgsNineCellFilter. Todo: make common base class
GDALDatasetH QgsRelief::openInputFile( int& nCellsX, int& nCellsY )
{
GDALDatasetH inputDataset = GDALOpen( TO8F( mInputFile ), GA_ReadOnly );
if ( inputDataset != NULL )
{
nCellsX = GDALGetRasterXSize( inputDataset );
nCellsY = GDALGetRasterYSize( inputDataset );
//we need at least one band
if ( GDALGetRasterCount( inputDataset ) < 1 )
{
GDALClose( inputDataset );
return NULL;
}
}
return inputDataset;
}
GDALDatasetH QgsRasterCalculator::openOutputFile( GDALDriverH outputDriver )
{
//open output file
char **papszOptions = nullptr;
GDALDatasetH outputDataset = GDALCreate( outputDriver, TO8F( mOutputFile ), mNumOutputColumns, mNumOutputRows, 1, GDT_Float32, papszOptions );
if ( !outputDataset )
{
return outputDataset;
}
//assign georef information
double geotransform[6];
outputGeoTransform( geotransform );
GDALSetGeoTransform( outputDataset, geotransform );
return outputDataset;
}
QgsLayerItem::Capability QgsOgrLayerItem::capabilities()
{
QgsDebugMsg( "mPath = " + mPath );
OGRRegisterAll();
OGRSFDriverH hDriver;
OGRDataSourceH hDataSource = OGROpen( TO8F( mPath ), true, &hDriver );
if ( !hDataSource )
return NoCapabilities;
QString driverName = OGR_Dr_GetName( hDriver );
OGR_DS_Destroy( hDataSource );
if ( driverName == "ESRI Shapefile" )
return SetCrs;
return NoCapabilities;
}
bool QgsGdalLayerItem::setCrs( QgsCoordinateReferenceSystem crs )
{
QgsDebugMsg( "mPath = " + mPath );
GDALAllRegister();
GDALDatasetH hDS = GDALOpen( TO8F( mPath ), GA_Update );
if ( !hDS )
return false;
QString wkt = crs.toWkt();
if ( GDALSetProjection( hDS, wkt.toLocal8Bit().data() ) != CE_None )
{
QgsDebugMsg( "Could not set CRS" );
return false;
}
GDALClose( hDS );
return true;
}
GDALDatasetH QgsNineCellFilter::openOutputFile( GDALDatasetH inputDataset, GDALDriverH outputDriver )
{
if ( inputDataset == NULL )
{
return NULL;
}
int xSize = GDALGetRasterXSize( inputDataset );
int ySize = GDALGetRasterYSize( inputDataset );;
//open output file
char **papszOptions = NULL;
GDALDatasetH outputDataset = GDALCreate( outputDriver, TO8F( mOutputFile ), xSize, ySize, 1, GDT_Float32, papszOptions );
if ( outputDataset == NULL )
{
return outputDataset;
}
//get geotransform from inputDataset
double geotransform[6];
if ( GDALGetGeoTransform( inputDataset, geotransform ) != CE_None )
{
GDALClose( outputDataset );
return NULL;
}
GDALSetGeoTransform( outputDataset, geotransform );
//make sure mCellSizeX and mCellSizeY are always > 0
mCellSizeX = geotransform[1];
if ( mCellSizeX < 0 )
{
mCellSizeX = -mCellSizeX;
}
mCellSizeY = geotransform[5];
if ( mCellSizeY < 0 )
{
mCellSizeY = -mCellSizeY;
}
const char* projection = GDALGetProjectionRef( inputDataset );
GDALSetProjection( outputDataset, projection );
return outputDataset;
}
QVector<QgsDataItem*> QgsOgrDataCollectionItem::createChildren()
{
QVector<QgsDataItem*> children;
OGRSFDriverH hDriver;
OGRDataSourceH hDataSource = OGROpen( TO8F( mPath ), false, &hDriver );
if ( !hDataSource )
return children;
int numLayers = OGR_DS_GetLayerCount( hDataSource );
for ( int i = 0; i < numLayers; i++ )
{
QgsOgrLayerItem* item = dataItemForLayer( this, QString(), mPath, hDataSource, i );
children.append( item );
}
OGR_DS_Destroy( hDataSource );
return children;
}
void QgsNewOgrConnection::testConnection()
{
QString uri;
uri = createDatabaseURI( cmbDatabaseTypes->currentText(), txtHost->text(),
txtDatabase->text(), txtPort->text(),
txtUsername->text(), txtPassword->text() );
QgsDebugMsg( "Connecting using uri = " + uri );
OGRRegisterAll();
OGRDataSourceH poDS;
OGRSFDriverH pahDriver;
CPLErrorReset();
poDS = OGROpen( TO8F( uri ), false, &pahDriver );
if ( poDS == NULL )
{
QMessageBox::information( this, tr( "Test connection" ), tr( "Connection failed - Check settings and try again.\n\nExtended error information:\n%1" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
}
else
{
QMessageBox::information( this, tr( "Test connection" ), tr( "Connection to %1 was successful" ).arg( uri ) );
OGRReleaseDataSource( poDS );
}
}
QgsOgrLayerItem::QgsOgrLayerItem( QgsDataItem* parent,
const QString& name, const QString& path, const QString& uri, LayerType layerType )
: QgsLayerItem( parent, name, path, uri, layerType, "ogr" )
{
mToolTip = uri;
setState( Populated ); // children are not expected
OGRRegisterAll();
OGRSFDriverH hDriver;
OGRDataSourceH hDataSource = OGROpen( TO8F( mPath ), true, &hDriver );
if ( hDataSource )
{
QString driverName = OGR_Dr_GetName( hDriver );
OGR_DS_Destroy( hDataSource );
if ( driverName == "ESRI Shapefile" )
mCapabilities |= SetCrs;
// It it is impossible to assign a crs to an existing layer
// No OGR_L_SetSpatialRef : http://trac.osgeo.org/gdal/ticket/4032
}
}
void QgsOracleSelectGeoraster::showSelection( const QString & line )
{
QString identification = line;
GDALDatasetH hDS = NULL;
GDALAccess eAccess = GA_ReadOnly;
/*
* Set access mode
*/
if ( checkBox->checkState() == Qt::Checked )
{
eAccess = GA_Update;
}
/*
* Try to open georaster dataset
*/
hDS = GDALOpenShared( TO8F( identification ), eAccess );
buttonBox->button( QDialogButtonBox::Ok )->setEnabled( false );
if ( hDS == NULL )
{
QMessageBox::information( this,
tr( "Open failed" ),
tr( "The connection to %1 failed. Please verify your connection parameters. Make sure you have the GDAL GeoRaster plugin installed." )
.arg( identification ) );
return;
}
buttonBox->button( QDialogButtonBox::Ok )->setEnabled( true );
/*
* Get subdataset list
*/
char **papszMetadata = NULL;
papszMetadata = GDALGetMetadata( hDS, "SUBDATASETS" );
int nSubDatasets = CSLCount( papszMetadata );
/*
* Add GeoRaster Layer
*/
if ( ! nSubDatasets )
{
mIface->addRasterLayer( identification );
GDALClose( hDS );
return;
}
/*
* Save subdataset
*/
QSettings settings;
settings.setValue( "/Oracle/connections/" +
cmbConnections->currentText() + "/subdtset", identification );
/*
* List subdatasets
*/
QStringList fields = identification.split( ',' );
QString count = QString::number( nSubDatasets / 2 );
QString plural = "s";
if ( count == "1" )
{
plural = "";
}
if ( fields.size() < 4 )
{
labelStatus->setText( QString( "%1 GeoRaster table%2" )
.arg( count ).arg( plural ) );
checkBox->setEnabled( false );
}
else if ( fields.size() == 4 )
{
labelStatus->setText( QString( "%1 GeoRaster column%2 on table %3" )
.arg( count ).arg( plural ).arg( fields[3] ) );
checkBox->setEnabled( false );
}
else if ( fields.size() == 5 )
{
labelStatus->setText( QString( "%1 GeoRaster object%2 on table %3 column %4" )
.arg( count ).arg( plural ).arg( fields[3] ).arg( fields[4] ) );
checkBox->setEnabled( true );
}
else
{
labelStatus->setText( QString( "%1 GeoRaster object%2 on table %3 column %4 where %5" )
.arg( count ).arg( plural ).arg( fields[3] ).arg( fields[4] ).arg( fields[5] ) );
checkBox->setEnabled( true );
}
/*
* Populate selection list based on subdataset names
*/
listWidget->clear();
QListWidgetItem *textItem;
for ( int i = 0; i < nSubDatasets; i += 2 )
{
QString metadata = papszMetadata[i];
QStringList subdataset = metadata.split( '=' );
textItem = new QListWidgetItem( subdataset[1] );
listWidget->addItem( textItem );
}
GDALClose( hDS );
}
int QgsRelief::processRaster( QProgressDialog* p )
{
//open input file
int xSize, ySize;
GDALDatasetH inputDataset = openInputFile( xSize, ySize );
if ( inputDataset == NULL )
{
return 1; //opening of input file failed
}
//output driver
GDALDriverH outputDriver = openOutputDriver();
if ( outputDriver == 0 )
{
return 2;
}
GDALDatasetH outputDataset = openOutputFile( inputDataset, outputDriver );
if ( outputDataset == NULL )
{
return 3; //create operation on output file failed
}
//initialize dependency filters with cell sizes
mHillshadeFilter285->setCellSizeX( mCellSizeX );
mHillshadeFilter285->setCellSizeY( mCellSizeY );
mHillshadeFilter285->setZFactor( mZFactor );
mHillshadeFilter300->setCellSizeX( mCellSizeX );
mHillshadeFilter300->setCellSizeY( mCellSizeY );
mHillshadeFilter300->setZFactor( mZFactor );
mHillshadeFilter315->setCellSizeX( mCellSizeX );
mHillshadeFilter315->setCellSizeY( mCellSizeY );
mHillshadeFilter315->setZFactor( mZFactor );
mSlopeFilter->setCellSizeX( mCellSizeX );
mSlopeFilter->setCellSizeY( mCellSizeY );
mSlopeFilter->setZFactor( mZFactor );
mAspectFilter->setCellSizeX( mCellSizeX );
mAspectFilter->setCellSizeY( mCellSizeY );
mAspectFilter->setZFactor( mZFactor );
//open first raster band for reading (operation is only for single band raster)
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, 1 );
if ( rasterBand == NULL )
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 4;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, NULL );
mSlopeFilter->setInputNodataValue( mInputNodataValue );
mAspectFilter->setInputNodataValue( mInputNodataValue );
mHillshadeFilter285->setInputNodataValue( mInputNodataValue );
mHillshadeFilter300->setInputNodataValue( mInputNodataValue );
mHillshadeFilter315->setInputNodataValue( mInputNodataValue );
GDALRasterBandH outputRedBand = GDALGetRasterBand( outputDataset, 1 );
GDALRasterBandH outputGreenBand = GDALGetRasterBand( outputDataset, 2 );
GDALRasterBandH outputBlueBand = GDALGetRasterBand( outputDataset, 3 );
if ( outputRedBand == NULL || outputGreenBand == NULL || outputBlueBand == NULL )
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 5;
}
//try to set -9999 as nodata value
GDALSetRasterNoDataValue( outputRedBand, -9999 );
GDALSetRasterNoDataValue( outputGreenBand, -9999 );
GDALSetRasterNoDataValue( outputBlueBand, -9999 );
mOutputNodataValue = GDALGetRasterNoDataValue( outputRedBand, NULL );
mSlopeFilter->setOutputNodataValue( mOutputNodataValue );
mAspectFilter->setOutputNodataValue( mOutputNodataValue );
mHillshadeFilter285->setOutputNodataValue( mOutputNodataValue );
mHillshadeFilter300->setOutputNodataValue( mOutputNodataValue );
mHillshadeFilter315->setOutputNodataValue( mOutputNodataValue );
if ( ySize < 3 ) //we require at least three rows (should be true for most datasets)
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 6;
}
//keep only three scanlines in memory at a time
float* scanLine1 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float* scanLine2 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float* scanLine3 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
unsigned char* resultRedLine = ( unsigned char * ) CPLMalloc( sizeof( unsigned char ) * xSize );
unsigned char* resultGreenLine = ( unsigned char * ) CPLMalloc( sizeof( unsigned char ) * xSize );
unsigned char* resultBlueLine = ( unsigned char * ) CPLMalloc( sizeof( unsigned char ) * xSize );
if ( p )
{
p->setMaximum( ySize );
}
bool resultOk;
//values outside the layer extent (if the 3x3 window is on the border) are sent to the processing method as (input) nodata values
for ( int i = 0; i < ySize; ++i )
{
if ( p )
{
p->setValue( i );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( i == 0 )
{
//fill scanline 1 with (input) nodata for the values above the first row and feed scanline2 with the first row
for ( int a = 0; a < xSize; ++a )
{
scanLine1[a] = mInputNodataValue;
}
GDALRasterIO( rasterBand, GF_Read, 0, 0, xSize, 1, scanLine2, xSize, 1, GDT_Float32, 0, 0 );
}
else
{
//normally fetch only scanLine3 and release scanline 1 if we move forward one row
CPLFree( scanLine1 );
scanLine1 = scanLine2;
scanLine2 = scanLine3;
scanLine3 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
}
if ( i == ySize - 1 ) //fill the row below the bottom with nodata values
{
for ( int a = 0; a < xSize; ++a )
{
scanLine3[a] = mInputNodataValue;
}
}
else
{
GDALRasterIO( rasterBand, GF_Read, 0, i + 1, xSize, 1, scanLine3, xSize, 1, GDT_Float32, 0, 0 );
}
for ( int j = 0; j < xSize; ++j )
{
if ( j == 0 )
{
resultOk = processNineCellWindow( &mInputNodataValue, &scanLine1[j], &scanLine1[j+1], &mInputNodataValue, &scanLine2[j], \
&scanLine2[j+1], &mInputNodataValue, &scanLine3[j], &scanLine3[j+1], \
&resultRedLine[j], &resultGreenLine[j], &resultBlueLine[j] );
}
else if ( j == xSize - 1 )
{
resultOk = processNineCellWindow( &scanLine1[j-1], &scanLine1[j], &mInputNodataValue, &scanLine2[j-1], &scanLine2[j], \
&mInputNodataValue, &scanLine3[j-1], &scanLine3[j], &mInputNodataValue, \
&resultRedLine[j], &resultGreenLine[j], &resultBlueLine[j] );
}
else
{
resultOk = processNineCellWindow( &scanLine1[j-1], &scanLine1[j], &scanLine1[j+1], &scanLine2[j-1], &scanLine2[j], \
&scanLine2[j+1], &scanLine3[j-1], &scanLine3[j], &scanLine3[j+1], \
&resultRedLine[j], &resultGreenLine[j], &resultBlueLine[j] );
}
if ( !resultOk )
{
resultRedLine[j] = mOutputNodataValue;
resultGreenLine[j] = mOutputNodataValue;
resultBlueLine[j] = mOutputNodataValue;
}
}
GDALRasterIO( outputRedBand, GF_Write, 0, i, xSize, 1, resultRedLine, xSize, 1, GDT_Byte, 0, 0 );
GDALRasterIO( outputGreenBand, GF_Write, 0, i, xSize, 1, resultGreenLine, xSize, 1, GDT_Byte, 0, 0 );
GDALRasterIO( outputBlueBand, GF_Write, 0, i, xSize, 1, resultBlueLine, xSize, 1, GDT_Byte, 0, 0 );
}
if ( p )
{
p->setValue( ySize );
}
CPLFree( resultRedLine );
CPLFree( resultBlueLine );
CPLFree( resultGreenLine );
CPLFree( scanLine1 );
CPLFree( scanLine2 );
CPLFree( scanLine3 );
GDALClose( inputDataset );
if ( p && p->wasCanceled() )
{
//delete the dataset without closing (because it is faster)
GDALDeleteDataset( outputDriver, TO8F( mOutputFile ) );
return 7;
}
GDALClose( outputDataset );
return 0;
}
// Slot called when the menu item is triggered
// If you created more menu items / toolbar buttons in initiGui, you should
// create a separate handler for each action - this single run() method will
// not be enough
void Heatmap::run()
{
HeatmapGui d( mQGisIface->mainWindow(), QgisGui::ModalDialogFlags, &mSessionSettings );
//check that dialog found a suitable vector layer
if ( !d.inputVectorLayer() )
{
mQGisIface->messageBar()->pushMessage( tr( "Layer not found" ), tr( "The heatmap plugin requires at least one point vector layer" ), QgsMessageBar::INFO, mQGisIface->messageTimeout() );
return;
}
if ( d.exec() != QDialog::Accepted )
{
return;
}
QgsVectorLayer* inputLayer = d.inputVectorLayer();
// Get the required data from the dialog
QgsRectangle myBBox = d.bbox();
int columns = d.columns();
int rows = d.rows();
double cellsize = d.cellSizeX(); // or d.cellSizeY(); both have the same value
mDecay = d.decayRatio();
KernelShape kernelShape = d.kernelShape();
OutputValues valueType = d.outputValues();
//is input layer multipoint?
bool isMultiPoint = inputLayer->wkbType() == QGis::WKBMultiPoint || inputLayer->wkbType() == QGis::WKBMultiPoint25D;
// Getting the rasterdataset in place
GDALAllRegister();
GDALDataset *emptyDataset;
GDALDriver *myDriver;
myDriver = GetGDALDriverManager()->GetDriverByName( d.outputFormat().toUtf8() );
if ( myDriver == NULL )
{
mQGisIface->messageBar()->pushMessage( tr( "GDAL driver error" ), tr( "Cannot open the driver for the specified format" ), QgsMessageBar::WARNING, mQGisIface->messageTimeout() );
return;
}
double geoTransform[6] = { myBBox.xMinimum(), cellsize, 0, myBBox.yMinimum(), 0, cellsize };
emptyDataset = myDriver->Create( d.outputFilename().toUtf8(), columns, rows, 1, GDT_Float32, NULL );
emptyDataset->SetGeoTransform( geoTransform );
// Set the projection on the raster destination to match the input layer
emptyDataset->SetProjection( inputLayer->crs().toWkt().toLocal8Bit().data() );
GDALRasterBand *poBand;
poBand = emptyDataset->GetRasterBand( 1 );
poBand->SetNoDataValue( NO_DATA );
float* line = ( float * ) CPLMalloc( sizeof( float ) * columns );
for ( int i = 0; i < columns ; i++ )
{
line[i] = NO_DATA;
}
// Write the empty raster
for ( int i = 0; i < rows ; i++ )
{
poBand->RasterIO( GF_Write, 0, i, columns, 1, line, columns, 1, GDT_Float32, 0, 0 );
}
CPLFree( line );
//close the dataset
GDALClose(( GDALDatasetH ) emptyDataset );
// open the raster in GA_Update mode
GDALDataset *heatmapDS;
heatmapDS = ( GDALDataset * ) GDALOpen( TO8F( d.outputFilename() ), GA_Update );
if ( !heatmapDS )
{
mQGisIface->messageBar()->pushMessage( tr( "Raster update error" ), tr( "Could not open the created raster for updating. The heatmap was not generated." ), QgsMessageBar::WARNING );
return;
}
poBand = heatmapDS->GetRasterBand( 1 );
QgsAttributeList myAttrList;
int rField = 0;
int wField = 0;
// Handle different radius options
double radius;
double radiusToMapUnits = 1;
int myBuffer = 0;
if ( d.variableRadius() )
{
rField = d.radiusField();
myAttrList.append( rField );
QgsDebugMsg( QString( "Radius Field index received: %1" ).arg( rField ) );
// If not using map units, then calculate a conversion factor to convert the radii to map units
if ( d.radiusUnit() == HeatmapGui::Meters )
{
radiusToMapUnits = mapUnitsOf( 1, inputLayer->crs() );
}
}
else
{
radius = d.radius(); // radius returned by d.radius() is already in map units
myBuffer = bufferSize( radius, cellsize );
}
if ( d.weighted() )
{
wField = d.weightField();
myAttrList.append( wField );
}
// This might have attributes or mightnot have attibutes at all
// based on the variableRadius() and weighted()
QgsFeatureIterator fit = inputLayer->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( myAttrList ) );
int totalFeatures = inputLayer->featureCount();
int counter = 0;
QProgressDialog p( tr( "Creating heatmap" ), tr( "Abort" ), 0, totalFeatures, mQGisIface->mainWindow() );
p.setWindowModality( Qt::ApplicationModal );
p.show();
QgsFeature myFeature;
while ( fit.nextFeature( myFeature ) )
{
counter++;
p.setValue( counter );
QApplication::processEvents();
if ( p.wasCanceled() )
{
mQGisIface->messageBar()->pushMessage( tr( "Heatmap generation aborted" ), tr( "QGIS will now load the partially-computed raster" ), QgsMessageBar::INFO, mQGisIface->messageTimeout() );
break;
}
QgsGeometry* featureGeometry = myFeature.geometry();
if ( !featureGeometry )
{
continue;
}
// convert the geometry to multipoint
QgsMultiPoint multiPoints;
if ( !isMultiPoint )
{
QgsPoint myPoint = featureGeometry->asPoint();
// avoiding any empty points or out of extent points
if (( myPoint.x() < myBBox.xMinimum() ) || ( myPoint.y() < myBBox.yMinimum() )
|| ( myPoint.x() > myBBox.xMaximum() ) || ( myPoint.y() > myBBox.yMaximum() ) )
{
continue;
}
multiPoints << myPoint;
}
else
{
multiPoints = featureGeometry->asMultiPoint();
}
// If radius is variable then fetch it and calculate new pixel buffer size
if ( d.variableRadius() )
{
radius = myFeature.attribute( rField ).toDouble() * radiusToMapUnits;
myBuffer = bufferSize( radius, cellsize );
}
int blockSize = 2 * myBuffer + 1; //Block SIDE would be more appropriate
double weight = 1.0;
if ( d.weighted() )
{
weight = myFeature.attribute( wField ).toDouble();
}
//loop through all points in multipoint
for ( QgsMultiPoint::const_iterator pointIt = multiPoints.constBegin(); pointIt != multiPoints.constEnd(); ++pointIt )
{
// avoiding any empty points or out of extent points
if ((( *pointIt ).x() < myBBox.xMinimum() ) || (( *pointIt ).y() < myBBox.yMinimum() )
|| (( *pointIt ).x() > myBBox.xMaximum() ) || (( *pointIt ).y() > myBBox.yMaximum() ) )
{
continue;
}
// calculate the pixel position
unsigned int xPosition, yPosition;
xPosition = ((( *pointIt ).x() - myBBox.xMinimum() ) / cellsize ) - myBuffer;
yPosition = ((( *pointIt ).y() - myBBox.yMinimum() ) / cellsize ) - myBuffer;
// get the data
float *dataBuffer = ( float * ) CPLMalloc( sizeof( float ) * blockSize * blockSize );
poBand->RasterIO( GF_Read, xPosition, yPosition, blockSize, blockSize,
dataBuffer, blockSize, blockSize, GDT_Float32, 0, 0 );
for ( int xp = 0; xp <= myBuffer; xp++ )
{
for ( int yp = 0; yp <= myBuffer; yp++ )
{
double distance = sqrt( pow( xp, 2.0 ) + pow( yp, 2.0 ) );
// is pixel outside search bandwidth of feature?
if ( distance > myBuffer )
{
continue;
}
double pixelValue = weight * calculateKernelValue( distance, myBuffer, kernelShape, valueType );
// clearing anamolies along the axes
if ( xp == 0 && yp == 0 )
{
pixelValue /= 4;
}
else if ( xp == 0 || yp == 0 )
{
pixelValue /= 2;
}
int pos[4];
pos[0] = ( myBuffer + xp ) * blockSize + ( myBuffer + yp );
pos[1] = ( myBuffer + xp ) * blockSize + ( myBuffer - yp );
pos[2] = ( myBuffer - xp ) * blockSize + ( myBuffer + yp );
pos[3] = ( myBuffer - xp ) * blockSize + ( myBuffer - yp );
for ( int p = 0; p < 4; p++ )
{
if ( dataBuffer[ pos[p] ] == NO_DATA )
{
dataBuffer[ pos[p] ] = 0;
}
dataBuffer[ pos[p] ] += pixelValue;
}
}
}
poBand->RasterIO( GF_Write, xPosition, yPosition, blockSize, blockSize,
dataBuffer, blockSize, blockSize, GDT_Float32, 0, 0 );
CPLFree( dataBuffer );
}
}
// Finally close the dataset
GDALClose(( GDALDatasetH ) heatmapDS );
// Open the file in QGIS window if requested
if ( d.addToCanvas() )
{
mQGisIface->addRasterLayer( d.outputFilename(), QFileInfo( d.outputFilename() ).baseName() );
}
}
bool matches = false;
foreach( QString wildcard, wildcards )
{
QRegExp rx( wildcard, Qt::CaseInsensitive, QRegExp::Wildcard );
if ( rx.exactMatch( info.fileName() ) )
{
matches = true;
break;
}
}
if ( !matches )
return 0;
}
GDALAllRegister();
GDALDatasetH hDS = GDALOpen( TO8F( thePath ), GA_ReadOnly );
if ( !hDS )
return 0;
QStringList sublayers = QgsGdalProvider::subLayers( hDS );
GDALClose( hDS );
QgsDebugMsg( "GdalDataset opened " + thePath );
QString name = info.completeBaseName();
QString uri = thePath;
QgsLayerItem * item = new QgsGdalLayerItem( parentItem, name, thePath, uri );
int QgsZonalStatistics::calculateStatistics( QProgressDialog* p )
{
if ( !mPolygonLayer || mPolygonLayer->geometryType() != QGis::Polygon )
{
return 1;
}
QgsVectorDataProvider* vectorProvider = mPolygonLayer->dataProvider();
if ( !vectorProvider )
{
return 2;
}
//open the raster layer and the raster band
GDALAllRegister();
GDALDatasetH inputDataset = GDALOpen( TO8F( mRasterFilePath ), GA_ReadOnly );
if ( !inputDataset )
{
return 3;
}
if ( GDALGetRasterCount( inputDataset ) < ( mRasterBand - 1 ) )
{
GDALClose( inputDataset );
return 4;
}
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, mRasterBand );
if ( !rasterBand )
{
GDALClose( inputDataset );
return 5;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, nullptr );
//get geometry info about raster layer
int nCellsXGDAL = GDALGetRasterXSize( inputDataset );
int nCellsYGDAL = GDALGetRasterYSize( inputDataset );
double geoTransform[6];
if ( GDALGetGeoTransform( inputDataset, geoTransform ) != CE_None )
{
GDALClose( inputDataset );
return 6;
}
double cellsizeX = geoTransform[1];
if ( cellsizeX < 0 )
{
cellsizeX = -cellsizeX;
}
double cellsizeY = geoTransform[5];
if ( cellsizeY < 0 )
{
cellsizeY = -cellsizeY;
}
QgsRectangle rasterBBox( geoTransform[0], geoTransform[3] - ( nCellsYGDAL * cellsizeY ),
geoTransform[0] + ( nCellsXGDAL * cellsizeX ), geoTransform[3] );
//add the new fields to the provider
QList<QgsField> newFieldList;
QString countFieldName;
if ( mStatistics & QgsZonalStatistics::Count )
{
countFieldName = getUniqueFieldName( mAttributePrefix + "count" );
QgsField countField( countFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( countField );
}
QString sumFieldName;
if ( mStatistics & QgsZonalStatistics::Sum )
{
sumFieldName = getUniqueFieldName( mAttributePrefix + "sum" );
QgsField sumField( sumFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( sumField );
}
QString meanFieldName;
if ( mStatistics & QgsZonalStatistics::Mean )
{
meanFieldName = getUniqueFieldName( mAttributePrefix + "mean" );
QgsField meanField( meanFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( meanField );
}
QString medianFieldName;
if ( mStatistics & QgsZonalStatistics::Median )
{
medianFieldName = getUniqueFieldName( mAttributePrefix + "median" );
QgsField medianField( medianFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( medianField );
}
QString stdevFieldName;
if ( mStatistics & QgsZonalStatistics::StDev )
{
stdevFieldName = getUniqueFieldName( mAttributePrefix + "stdev" );
QgsField stdField( stdevFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( stdField );
}
QString minFieldName;
if ( mStatistics & QgsZonalStatistics::Min )
{
minFieldName = getUniqueFieldName( mAttributePrefix + "min" );
QgsField minField( minFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( minField );
}
QString maxFieldName;
if ( mStatistics & QgsZonalStatistics::Max )
{
maxFieldName = getUniqueFieldName( mAttributePrefix + "max" );
QgsField maxField( maxFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( maxField );
}
QString rangeFieldName;
if ( mStatistics & QgsZonalStatistics::Range )
{
rangeFieldName = getUniqueFieldName( mAttributePrefix + "range" );
QgsField rangeField( rangeFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( rangeField );
}
QString minorityFieldName;
if ( mStatistics & QgsZonalStatistics::Minority )
{
minorityFieldName = getUniqueFieldName( mAttributePrefix + "minority" );
QgsField minorityField( minorityFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( minorityField );
}
QString majorityFieldName;
if ( mStatistics & QgsZonalStatistics::Majority )
{
majorityFieldName = getUniqueFieldName( mAttributePrefix + "majority" );
QgsField majField( majorityFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( majField );
}
QString varietyFieldName;
if ( mStatistics & QgsZonalStatistics::Variety )
{
varietyFieldName = getUniqueFieldName( mAttributePrefix + "variety" );
QgsField varietyField( varietyFieldName, QVariant::Int, "int" );
newFieldList.push_back( varietyField );
}
vectorProvider->addAttributes( newFieldList );
//index of the new fields
int countIndex = mStatistics & QgsZonalStatistics::Count ? vectorProvider->fieldNameIndex( countFieldName ) : -1;
int sumIndex = mStatistics & QgsZonalStatistics::Sum ? vectorProvider->fieldNameIndex( sumFieldName ) : -1;
int meanIndex = mStatistics & QgsZonalStatistics::Mean ? vectorProvider->fieldNameIndex( meanFieldName ) : -1;
int medianIndex = mStatistics & QgsZonalStatistics::Median ? vectorProvider->fieldNameIndex( medianFieldName ) : -1;
int stdevIndex = mStatistics & QgsZonalStatistics::StDev ? vectorProvider->fieldNameIndex( stdevFieldName ) : -1;
int minIndex = mStatistics & QgsZonalStatistics::Min ? vectorProvider->fieldNameIndex( minFieldName ) : -1;
int maxIndex = mStatistics & QgsZonalStatistics::Max ? vectorProvider->fieldNameIndex( maxFieldName ) : -1;
int rangeIndex = mStatistics & QgsZonalStatistics::Range ? vectorProvider->fieldNameIndex( rangeFieldName ) : -1;
int minorityIndex = mStatistics & QgsZonalStatistics::Minority ? vectorProvider->fieldNameIndex( minorityFieldName ) : -1;
int majorityIndex = mStatistics & QgsZonalStatistics::Majority ? vectorProvider->fieldNameIndex( majorityFieldName ) : -1;
int varietyIndex = mStatistics & QgsZonalStatistics::Variety ? vectorProvider->fieldNameIndex( varietyFieldName ) : -1;
if (( mStatistics & QgsZonalStatistics::Count && countIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Sum && sumIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Mean && meanIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Median && medianIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::StDev && stdevIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Min && minIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Max && maxIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Range && rangeIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Minority && minorityIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Majority && majorityIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Variety && varietyIndex == -1 )
)
{
//failed to create a required field
return 8;
}
//progress dialog
long featureCount = vectorProvider->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
//iterate over each polygon
QgsFeatureRequest request;
request.setSubsetOfAttributes( QgsAttributeList() );
QgsFeatureIterator fi = vectorProvider->getFeatures( request );
QgsFeature f;
bool statsStoreValues = ( mStatistics & QgsZonalStatistics::Median ) ||
( mStatistics & QgsZonalStatistics::StDev );
bool statsStoreValueCount = ( mStatistics & QgsZonalStatistics::Minority ) ||
( mStatistics & QgsZonalStatistics::Majority );
FeatureStats featureStats( statsStoreValues, statsStoreValueCount );
int featureCounter = 0;
QgsChangedAttributesMap changeMap;
while ( fi.nextFeature( f ) )
{
if ( p )
{
p->setValue( featureCounter );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !f.constGeometry() )
{
++featureCounter;
continue;
}
const QgsGeometry* featureGeometry = f.constGeometry();
QgsRectangle featureRect = featureGeometry->boundingBox().intersect( &rasterBBox );
if ( featureRect.isEmpty() )
{
++featureCounter;
continue;
}
int offsetX, offsetY, nCellsX, nCellsY;
if ( cellInfoForBBox( rasterBBox, featureRect, cellsizeX, cellsizeY, offsetX, offsetY, nCellsX, nCellsY ) != 0 )
{
++featureCounter;
continue;
}
//avoid access to cells outside of the raster (may occur because of rounding)
if (( offsetX + nCellsX ) > nCellsXGDAL )
{
nCellsX = nCellsXGDAL - offsetX;
}
if (( offsetY + nCellsY ) > nCellsYGDAL )
{
nCellsY = nCellsYGDAL - offsetY;
}
statisticsFromMiddlePointTest( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, featureStats );
if ( featureStats.count <= 1 )
{
//the cell resolution is probably larger than the polygon area. We switch to precise pixel - polygon intersection in this case
statisticsFromPreciseIntersection( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, featureStats );
}
//write the statistics value to the vector data provider
QgsAttributeMap changeAttributeMap;
if ( mStatistics & QgsZonalStatistics::Count )
changeAttributeMap.insert( countIndex, QVariant( featureStats.count ) );
if ( mStatistics & QgsZonalStatistics::Sum )
changeAttributeMap.insert( sumIndex, QVariant( featureStats.sum ) );
if ( featureStats.count > 0 )
{
double mean = featureStats.sum / featureStats.count;
if ( mStatistics & QgsZonalStatistics::Mean )
changeAttributeMap.insert( meanIndex, QVariant( mean ) );
if ( mStatistics & QgsZonalStatistics::Median )
{
qSort( featureStats.values.begin(), featureStats.values.end() );
int size = featureStats.values.count();
bool even = ( size % 2 ) < 1;
double medianValue;
if ( even )
{
medianValue = ( featureStats.values.at( size / 2 - 1 ) + featureStats.values.at( size / 2 ) ) / 2;
}
else //odd
{
medianValue = featureStats.values.at(( size + 1 ) / 2 - 1 );
}
changeAttributeMap.insert( medianIndex, QVariant( medianValue ) );
}
if ( mStatistics & QgsZonalStatistics::StDev )
{
double sumSquared = 0;
for ( int i = 0; i < featureStats.values.count(); ++i )
{
double diff = featureStats.values.at( i ) - mean;
sumSquared += diff * diff;
}
double stdev = qPow( sumSquared / featureStats.values.count(), 0.5 );
changeAttributeMap.insert( stdevIndex, QVariant( stdev ) );
}
if ( mStatistics & QgsZonalStatistics::Min )
changeAttributeMap.insert( minIndex, QVariant( featureStats.min ) );
if ( mStatistics & QgsZonalStatistics::Max )
changeAttributeMap.insert( maxIndex, QVariant( featureStats.max ) );
if ( mStatistics & QgsZonalStatistics::Range )
changeAttributeMap.insert( rangeIndex, QVariant( featureStats.max - featureStats.min ) );
if ( mStatistics & QgsZonalStatistics::Minority || mStatistics & QgsZonalStatistics::Majority )
{
QList<int> vals = featureStats.valueCount.values();
qSort( vals.begin(), vals.end() );
if ( mStatistics & QgsZonalStatistics::Minority )
{
float minorityKey = featureStats.valueCount.key( vals.first() );
changeAttributeMap.insert( minorityIndex, QVariant( minorityKey ) );
}
if ( mStatistics & QgsZonalStatistics::Majority )
{
float majKey = featureStats.valueCount.key( vals.last() );
changeAttributeMap.insert( majorityIndex, QVariant( majKey ) );
}
}
if ( mStatistics & QgsZonalStatistics::Variety )
changeAttributeMap.insert( varietyIndex, QVariant( featureStats.valueCount.count() ) );
}
changeMap.insert( f.id(), changeAttributeMap );
++featureCounter;
}
vectorProvider->changeAttributeValues( changeMap );
if ( p )
{
p->setValue( featureCount );
}
GDALClose( inputDataset );
mPolygonLayer->updateFields();
if ( p && p->wasCanceled() )
{
return 9;
}
return 0;
}
int QgsRasterCalculator::processCalculation( QProgressDialog* p )
{
//prepare search string / tree
QString errorString;
QgsRasterCalcNode* calcNode = QgsRasterCalcNode::parseRasterCalcString( mFormulaString, errorString );
if ( !calcNode )
{
//error
return static_cast<int>( ParserError );
}
QMap< QString, QgsRasterBlock* > inputBlocks;
QVector<QgsRasterCalculatorEntry>::const_iterator it = mRasterEntries.constBegin();
for ( ; it != mRasterEntries.constEnd(); ++it )
{
if ( !it->raster ) // no raster layer in entry
{
delete calcNode;
qDeleteAll( inputBlocks );
return static_cast< int >( InputLayerError );
}
QgsRasterBlock* block = nullptr;
// if crs transform needed
if ( it->raster->crs() != mOutputCrs )
{
QgsRasterProjector proj;
proj.setCRS( it->raster->crs(), mOutputCrs );
proj.setInput( it->raster->dataProvider() );
proj.setPrecision( QgsRasterProjector::Exact );
block = proj.block( it->bandNumber, mOutputRectangle, mNumOutputColumns, mNumOutputRows );
}
else
{
block = it->raster->dataProvider()->block( it->bandNumber, mOutputRectangle, mNumOutputColumns, mNumOutputRows );
}
if ( block->isEmpty() )
{
delete block;
delete calcNode;
qDeleteAll( inputBlocks );
return static_cast<int>( MemoryError );
}
inputBlocks.insert( it->ref, block );
}
//open output dataset for writing
GDALDriverH outputDriver = openOutputDriver();
if ( !outputDriver )
{
return static_cast< int >( CreateOutputError );
}
GDALDatasetH outputDataset = openOutputFile( outputDriver );
GDALSetProjection( outputDataset, mOutputCrs.toWkt().toLocal8Bit().data() );
GDALRasterBandH outputRasterBand = GDALGetRasterBand( outputDataset, 1 );
float outputNodataValue = -FLT_MAX;
GDALSetRasterNoDataValue( outputRasterBand, outputNodataValue );
if ( p )
{
p->setMaximum( mNumOutputRows );
}
QgsRasterMatrix resultMatrix;
resultMatrix.setNodataValue( outputNodataValue );
//read / write line by line
for ( int i = 0; i < mNumOutputRows; ++i )
{
if ( p )
{
p->setValue( i );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( calcNode->calculate( inputBlocks, resultMatrix, i ) )
{
bool resultIsNumber = resultMatrix.isNumber();
float* calcData = new float[mNumOutputColumns];
for ( int j = 0; j < mNumOutputColumns; ++j )
{
calcData[j] = ( float )( resultIsNumber ? resultMatrix.number() : resultMatrix.data()[j] );
}
//write scanline to the dataset
if ( GDALRasterIO( outputRasterBand, GF_Write, 0, i, mNumOutputColumns, 1, calcData, mNumOutputColumns, 1, GDT_Float32, 0, 0 ) != CE_None )
{
qWarning( "RasterIO error!" );
}
delete[] calcData;
}
}
if ( p )
{
p->setValue( mNumOutputRows );
}
//close datasets and release memory
delete calcNode;
qDeleteAll( inputBlocks );
inputBlocks.clear();
if ( p && p->wasCanceled() )
{
//delete the dataset without closing (because it is faster)
GDALDeleteDataset( outputDriver, TO8F( mOutputFile ) );
return static_cast< int >( Cancelled );
}
GDALClose( outputDataset );
return static_cast< int >( Success );
}
int QgsZonalStatistics::calculateStatistics( QProgressDialog* p )
{
if ( !mPolygonLayer || mPolygonLayer->geometryType() != QGis::Polygon )
{
return 1;
}
QgsVectorDataProvider* vectorProvider = mPolygonLayer->dataProvider();
if ( !vectorProvider )
{
return 2;
}
//open the raster layer and the raster band
GDALAllRegister();
GDALDatasetH inputDataset = GDALOpen( TO8F( mRasterFilePath ), GA_ReadOnly );
if ( inputDataset == NULL )
{
return 3;
}
if ( GDALGetRasterCount( inputDataset ) < ( mRasterBand - 1 ) )
{
GDALClose( inputDataset );
return 4;
}
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, mRasterBand );
if ( rasterBand == NULL )
{
GDALClose( inputDataset );
return 5;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, NULL );
//get geometry info about raster layer
int nCellsXGDAL = GDALGetRasterXSize( inputDataset );
int nCellsYGDAL = GDALGetRasterYSize( inputDataset );
double geoTransform[6];
if ( GDALGetGeoTransform( inputDataset, geoTransform ) != CE_None )
{
GDALClose( inputDataset );
return 6;
}
double cellsizeX = geoTransform[1];
if ( cellsizeX < 0 )
{
cellsizeX = -cellsizeX;
}
double cellsizeY = geoTransform[5];
if ( cellsizeY < 0 )
{
cellsizeY = -cellsizeY;
}
QgsRectangle rasterBBox( geoTransform[0], geoTransform[3] - ( nCellsYGDAL * cellsizeY ),
geoTransform[0] + ( nCellsXGDAL * cellsizeX ), geoTransform[3] );
//add the new count, sum, mean fields to the provider
QList<QgsField> newFieldList;
QString countFieldName = getUniqueFieldName( mAttributePrefix + "count" );
QString sumFieldName = getUniqueFieldName( mAttributePrefix + "sum" );
QString meanFieldName = getUniqueFieldName( mAttributePrefix + "mean" );
QgsField countField( countFieldName, QVariant::Double, "double precision" );
QgsField sumField( sumFieldName, QVariant::Double, "double precision" );
QgsField meanField( meanFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( countField );
newFieldList.push_back( sumField );
newFieldList.push_back( meanField );
vectorProvider->addAttributes( newFieldList );
//index of the new fields
int countIndex = vectorProvider->fieldNameIndex( countFieldName );
int sumIndex = vectorProvider->fieldNameIndex( sumFieldName );
int meanIndex = vectorProvider->fieldNameIndex( meanFieldName );
if ( countIndex == -1 || sumIndex == -1 || meanIndex == -1 )
{
return 8;
}
//progress dialog
long featureCount = vectorProvider->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
//iterate over each polygon
QgsFeatureRequest request;
request.setSubsetOfAttributes( QgsAttributeList() );
QgsFeatureIterator fi = vectorProvider->getFeatures( request );
QgsFeature f;
double count = 0;
double sum = 0;
double mean = 0;
int featureCounter = 0;
while ( fi.nextFeature( f ) )
{
if ( p )
{
p->setValue( featureCounter );
}
if ( p && p->wasCanceled() )
{
break;
}
QgsGeometry* featureGeometry = f.geometry();
if ( !featureGeometry )
{
++featureCounter;
continue;
}
QgsRectangle featureRect = featureGeometry->boundingBox().intersect( &rasterBBox );
if ( featureRect.isEmpty() )
{
++featureCounter;
continue;
}
int offsetX, offsetY, nCellsX, nCellsY;
if ( cellInfoForBBox( rasterBBox, featureRect, cellsizeX, cellsizeY, offsetX, offsetY, nCellsX, nCellsY ) != 0 )
{
++featureCounter;
continue;
}
//avoid access to cells outside of the raster (may occur because of rounding)
if (( offsetX + nCellsX ) > nCellsXGDAL )
{
nCellsX = nCellsXGDAL - offsetX;
}
if (( offsetY + nCellsY ) > nCellsYGDAL )
{
nCellsY = nCellsYGDAL - offsetY;
}
statisticsFromMiddlePointTest( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, sum, count );
if ( count <= 1 )
{
//the cell resolution is probably larger than the polygon area. We switch to precise pixel - polygon intersection in this case
statisticsFromPreciseIntersection( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, sum, count );
}
if ( count == 0 )
{
mean = 0;
}
else
{
mean = sum / count;
}
//write the statistics value to the vector data provider
QgsChangedAttributesMap changeMap;
QgsAttributeMap changeAttributeMap;
changeAttributeMap.insert( countIndex, QVariant( count ) );
changeAttributeMap.insert( sumIndex, QVariant( sum ) );
changeAttributeMap.insert( meanIndex, QVariant( mean ) );
changeMap.insert( f.id(), changeAttributeMap );
vectorProvider->changeAttributeValues( changeMap );
++featureCounter;
}
if ( p )
{
p->setValue( featureCount );
}
GDALClose( inputDataset );
mPolygonLayer->updateFields();
if ( p && p->wasCanceled() )
{
return 9;
}
return 0;
}
