void QgsZonalStatistics::statisticsFromMiddlePointTest( void* band, const QgsGeometry& poly, int pixelOffsetX,
int pixelOffsetY, int nCellsX, int nCellsY, double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, FeatureStats &stats )
{
double cellCenterX, cellCenterY;
float* scanLine = ( float * ) CPLMalloc( sizeof( float ) * nCellsX );
cellCenterY = rasterBBox.yMaximum() - pixelOffsetY * cellSizeY - cellSizeY / 2;
stats.reset();
GEOSGeometry* polyGeos = poly.exportToGeos();
if ( !polyGeos )
{
return;
}
GEOSContextHandle_t geosctxt = QgsGeometry::getGEOSHandler();
const GEOSPreparedGeometry* polyGeosPrepared = GEOSPrepare_r( geosctxt, polyGeos );
if ( !polyGeosPrepared )
{
GEOSGeom_destroy_r( geosctxt, polyGeos );
return;
}
GEOSCoordSequence* cellCenterCoords = nullptr;
GEOSGeometry* currentCellCenter = nullptr;
for ( int i = 0; i < nCellsY; ++i )
{
if ( GDALRasterIO( band, GF_Read, pixelOffsetX, pixelOffsetY + i, nCellsX, 1, scanLine, nCellsX, 1, GDT_Float32, 0, 0 )
!= CPLE_None )
{
continue;
}
cellCenterX = rasterBBox.xMinimum() + pixelOffsetX * cellSizeX + cellSizeX / 2;
for ( int j = 0; j < nCellsX; ++j )
{
if ( validPixel( scanLine[j] ) )
{
GEOSGeom_destroy_r( geosctxt, currentCellCenter );
cellCenterCoords = GEOSCoordSeq_create_r( geosctxt, 1, 2 );
GEOSCoordSeq_setX_r( geosctxt, cellCenterCoords, 0, cellCenterX );
GEOSCoordSeq_setY_r( geosctxt, cellCenterCoords, 0, cellCenterY );
currentCellCenter = GEOSGeom_createPoint_r( geosctxt, cellCenterCoords );
if ( GEOSPreparedContains_r( geosctxt, polyGeosPrepared, currentCellCenter ) )
{
stats.addValue( scanLine[j] );
}
}
cellCenterX += cellSizeX;
}
cellCenterY -= cellSizeY;
}
GEOSGeom_destroy_r( geosctxt, currentCellCenter );
CPLFree( scanLine );
GEOSPreparedGeom_destroy_r( geosctxt, polyGeosPrepared );
GEOSGeom_destroy_r( geosctxt, polyGeos );
}
void QgsZonalStatistics::statisticsFromMiddlePointTest( const QgsGeometry &poly, int pixelOffsetX,
int pixelOffsetY, int nCellsX, int nCellsY, double cellSizeX, double cellSizeY, const QgsRectangle &rasterBBox, FeatureStats &stats )
{
double cellCenterX, cellCenterY;
cellCenterY = rasterBBox.yMaximum() - pixelOffsetY * cellSizeY - cellSizeY / 2;
stats.reset();
GEOSGeometry *polyGeos = poly.exportToGeos();
if ( !polyGeos )
{
return;
}
GEOSContextHandle_t geosctxt = QgsGeometry::getGEOSHandler();
const GEOSPreparedGeometry *polyGeosPrepared = GEOSPrepare_r( geosctxt, polyGeos );
if ( !polyGeosPrepared )
{
GEOSGeom_destroy_r( geosctxt, polyGeos );
return;
}
GEOSCoordSequence *cellCenterCoords = nullptr;
GEOSGeometry *currentCellCenter = nullptr;
QgsRectangle featureBBox = poly.boundingBox().intersect( &rasterBBox );
QgsRectangle intersectBBox = rasterBBox.intersect( &featureBBox );
QgsRasterBlock *block = mRasterProvider->block( mRasterBand, intersectBBox, nCellsX, nCellsY );
for ( int i = 0; i < nCellsY; ++i )
{
cellCenterX = rasterBBox.xMinimum() + pixelOffsetX * cellSizeX + cellSizeX / 2;
for ( int j = 0; j < nCellsX; ++j )
{
if ( validPixel( block->value( i, j ) ) )
{
GEOSGeom_destroy_r( geosctxt, currentCellCenter );
cellCenterCoords = GEOSCoordSeq_create_r( geosctxt, 1, 2 );
GEOSCoordSeq_setX_r( geosctxt, cellCenterCoords, 0, cellCenterX );
GEOSCoordSeq_setY_r( geosctxt, cellCenterCoords, 0, cellCenterY );
currentCellCenter = GEOSGeom_createPoint_r( geosctxt, cellCenterCoords );
if ( GEOSPreparedContains_r( geosctxt, polyGeosPrepared, currentCellCenter ) )
{
stats.addValue( block->value( i, j ) );
}
}
cellCenterX += cellSizeX;
}
cellCenterY -= cellSizeY;
}
GEOSGeom_destroy_r( geosctxt, currentCellCenter );
GEOSPreparedGeom_destroy_r( geosctxt, polyGeosPrepared );
GEOSGeom_destroy_r( geosctxt, polyGeos );
delete block;
}
void QgsZonalStatistics::statisticsFromPreciseIntersection( const QgsGeometry &poly, int pixelOffsetX,
int pixelOffsetY, int nCellsX, int nCellsY, double cellSizeX, double cellSizeY, const QgsRectangle &rasterBBox, FeatureStats &stats )
{
stats.reset();
double currentY = rasterBBox.yMaximum() - pixelOffsetY * cellSizeY - cellSizeY / 2;
QgsGeometry pixelRectGeometry;
double hCellSizeX = cellSizeX / 2.0;
double hCellSizeY = cellSizeY / 2.0;
double pixelArea = cellSizeX * cellSizeY;
double weight = 0;
QgsRectangle featureBBox = poly.boundingBox().intersect( &rasterBBox );
QgsRectangle intersectBBox = rasterBBox.intersect( &featureBBox );
QgsRasterBlock *block = mRasterProvider->block( mRasterBand, intersectBBox, nCellsX, nCellsY );
for ( int i = 0; i < nCellsY; ++i )
{
double currentX = rasterBBox.xMinimum() + cellSizeX / 2.0 + pixelOffsetX * cellSizeX;
for ( int j = 0; j < nCellsX; ++j )
{
if ( !validPixel( block->value( i, j ) ) )
{
continue;
}
pixelRectGeometry = QgsGeometry::fromRect( QgsRectangle( currentX - hCellSizeX, currentY - hCellSizeY, currentX + hCellSizeX, currentY + hCellSizeY ) );
if ( !pixelRectGeometry.isNull() )
{
//intersection
QgsGeometry intersectGeometry = pixelRectGeometry.intersection( poly );
if ( !intersectGeometry.isNull() )
{
double intersectionArea = intersectGeometry.area();
if ( intersectionArea >= 0.0 )
{
weight = intersectionArea / pixelArea;
stats.addValue( block->value( i, j ), weight );
}
}
pixelRectGeometry = QgsGeometry();
}
currentX += cellSizeX;
}
currentY -= cellSizeY;
}
delete block;
}
void QgsZonalStatistics::statisticsFromPreciseIntersection( void* band, const QgsGeometry* poly, int pixelOffsetX,
int pixelOffsetY, int nCellsX, int nCellsY, double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, FeatureStats &stats )
{
stats.reset();
double currentY = rasterBBox.yMaximum() - pixelOffsetY * cellSizeY - cellSizeY / 2;
float* pixelData = ( float * ) CPLMalloc( sizeof( float ) );
QgsGeometry* pixelRectGeometry = nullptr;
double hCellSizeX = cellSizeX / 2.0;
double hCellSizeY = cellSizeY / 2.0;
double pixelArea = cellSizeX * cellSizeY;
double weight = 0;
for ( int row = 0; row < nCellsY; ++row )
{
double currentX = rasterBBox.xMinimum() + cellSizeX / 2.0 + pixelOffsetX * cellSizeX;
for ( int col = 0; col < nCellsX; ++col )
{
if ( GDALRasterIO( band, GF_Read, pixelOffsetX + col, pixelOffsetY + row, nCellsX, 1, pixelData, 1, 1, GDT_Float32, 0, 0 ) != CE_None )
QgsDebugMsg( "Raster IO Error" );
if ( !validPixel( *pixelData ) )
continue;
pixelRectGeometry = QgsGeometry::fromRect( QgsRectangle( currentX - hCellSizeX, currentY - hCellSizeY, currentX + hCellSizeX, currentY + hCellSizeY ) );
if ( pixelRectGeometry )
{
//intersection
QgsGeometry *intersectGeometry = pixelRectGeometry->intersection( poly );
if ( intersectGeometry )
{
double intersectionArea = intersectGeometry->area();
if ( intersectionArea >= 0.0 )
{
weight = intersectionArea / pixelArea;
stats.addValue( *pixelData, weight );
}
delete intersectGeometry;
}
delete pixelRectGeometry;
pixelRectGeometry = nullptr;
}
currentX += cellSizeX;
}
currentY -= cellSizeY;
}
CPLFree( pixelData );
}
