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Current view: top level - analysis/processing - qgsalgorithmrasterlayeruniquevalues.cpp (source / functions) Hit Total Coverage
Test: coverage.info.cleaned Lines: 0 141 0.0 %
Date: 2021-03-26 12:19:53 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /***************************************************************************
       2                 :            :                          qgsalgorithmrasterlayeruniquevalues.cpp
       3                 :            :                          ---------------------
       4                 :            :     begin                : April 2017
       5                 :            :     copyright            : (C) 2017 by Mathieu Pellerin
       6                 :            :     email                : nirvn dot asia at gmail dot com
       7                 :            :  ***************************************************************************/
       8                 :            : 
       9                 :            : /***************************************************************************
      10                 :            :  *                                                                         *
      11                 :            :  *   This program is free software; you can redistribute it and/or modify  *
      12                 :            :  *   it under the terms of the GNU General Public License as published by  *
      13                 :            :  *   the Free Software Foundation; either version 2 of the License, or     *
      14                 :            :  *   (at your option) any later version.                                   *
      15                 :            :  *                                                                         *
      16                 :            :  ***************************************************************************/
      17                 :            : 
      18                 :            : #include "qgsalgorithmrasterlayeruniquevalues.h"
      19                 :            : #include "qgsstringutils.h"
      20                 :            : #include <QTextStream>
      21                 :            : 
      22                 :            : ///@cond PRIVATE
      23                 :            : 
      24                 :          0 : QString QgsRasterLayerUniqueValuesReportAlgorithm::name() const
      25                 :            : {
      26                 :          0 :   return QStringLiteral( "rasterlayeruniquevaluesreport" );
      27                 :            : }
      28                 :            : 
      29                 :          0 : QString QgsRasterLayerUniqueValuesReportAlgorithm::displayName() const
      30                 :            : {
      31                 :          0 :   return QObject::tr( "Raster layer unique values report" );
      32                 :            : }
      33                 :            : 
      34                 :          0 : QStringList QgsRasterLayerUniqueValuesReportAlgorithm::tags() const
      35                 :            : {
      36                 :          0 :   return QObject::tr( "count,area,statistics" ).split( ',' );
      37                 :          0 : }
      38                 :            : 
      39                 :          0 : QString QgsRasterLayerUniqueValuesReportAlgorithm::group() const
      40                 :            : {
      41                 :          0 :   return QObject::tr( "Raster analysis" );
      42                 :            : }
      43                 :            : 
      44                 :          0 : QString QgsRasterLayerUniqueValuesReportAlgorithm::groupId() const
      45                 :            : {
      46                 :          0 :   return QStringLiteral( "rasteranalysis" );
      47                 :            : }
      48                 :            : 
      49                 :          0 : void QgsRasterLayerUniqueValuesReportAlgorithm::initAlgorithm( const QVariantMap & )
      50                 :            : {
      51                 :          0 :   addParameter( new QgsProcessingParameterRasterLayer( QStringLiteral( "INPUT" ),
      52                 :          0 :                 QObject::tr( "Input layer" ) ) );
      53                 :          0 :   addParameter( new QgsProcessingParameterBand( QStringLiteral( "BAND" ),
      54                 :          0 :                 QObject::tr( "Band number" ), 1, QStringLiteral( "INPUT" ) ) );
      55                 :          0 :   addParameter( new QgsProcessingParameterFileDestination( QStringLiteral( "OUTPUT_HTML_FILE" ),
      56                 :          0 :                 QObject::tr( "Unique values report" ), QObject::tr( "HTML files (*.html)" ), QVariant(), true ) );
      57                 :          0 :   addParameter( new QgsProcessingParameterFeatureSink( QStringLiteral( "OUTPUT_TABLE" ),
      58                 :          0 :                 QObject::tr( "Unique values table" ), QgsProcessing::TypeVector, QVariant(), true, false ) );
      59                 :            : 
      60                 :          0 :   addOutput( new QgsProcessingOutputString( QStringLiteral( "EXTENT" ), QObject::tr( "Extent" ) ) );
      61                 :          0 :   addOutput( new QgsProcessingOutputString( QStringLiteral( "CRS_AUTHID" ), QObject::tr( "CRS authority identifier" ) ) );
      62                 :          0 :   addOutput( new QgsProcessingOutputNumber( QStringLiteral( "WIDTH_IN_PIXELS" ), QObject::tr( "Width in pixels" ) ) );
      63                 :          0 :   addOutput( new QgsProcessingOutputNumber( QStringLiteral( "HEIGHT_IN_PIXELS" ), QObject::tr( "Height in pixels" ) ) );
      64                 :          0 :   addOutput( new QgsProcessingOutputNumber( QStringLiteral( "TOTAL_PIXEL_COUNT" ), QObject::tr( "Total pixel count" ) ) );
      65                 :          0 :   addOutput( new QgsProcessingOutputNumber( QStringLiteral( "NODATA_PIXEL_COUNT" ), QObject::tr( "NODATA pixel count" ) ) );
      66                 :          0 : }
      67                 :            : 
      68                 :          0 : QString QgsRasterLayerUniqueValuesReportAlgorithm::shortHelpString() const
      69                 :            : {
      70                 :          0 :   return QObject::tr( "This algorithm returns the count and area of each unique value in a given raster layer." );
      71                 :            : }
      72                 :            : 
      73                 :          0 : QgsRasterLayerUniqueValuesReportAlgorithm *QgsRasterLayerUniqueValuesReportAlgorithm::createInstance() const
      74                 :            : {
      75                 :          0 :   return new QgsRasterLayerUniqueValuesReportAlgorithm();
      76                 :          0 : }
      77                 :            : 
      78                 :          0 : bool QgsRasterLayerUniqueValuesReportAlgorithm::prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
      79                 :            : {
      80                 :          0 :   QgsRasterLayer *layer = parameterAsRasterLayer( parameters, QStringLiteral( "INPUT" ), context );
      81                 :          0 :   int band = parameterAsInt( parameters, QStringLiteral( "BAND" ), context );
      82                 :            : 
      83                 :          0 :   if ( !layer )
      84                 :          0 :     throw QgsProcessingException( invalidRasterError( parameters, QStringLiteral( "INPUT" ) ) );
      85                 :            : 
      86                 :          0 :   mBand = parameterAsInt( parameters, QStringLiteral( "BAND" ), context );
      87                 :          0 :   if ( mBand < 1 || mBand > layer->bandCount() )
      88                 :          0 :     throw QgsProcessingException( QObject::tr( "Invalid band number for BAND (%1): Valid values for input raster are 1 to %2" ).arg( mBand )
      89                 :          0 :                                   .arg( layer->bandCount() ) );
      90                 :            : 
      91                 :          0 :   mInterface.reset( layer->dataProvider()->clone() );
      92                 :          0 :   mHasNoDataValue = layer->dataProvider()->sourceHasNoDataValue( band );
      93                 :          0 :   mLayerWidth = layer->width();
      94                 :          0 :   mLayerHeight = layer->height();
      95                 :          0 :   mExtent = layer->extent();
      96                 :          0 :   mCrs = layer->crs();
      97                 :          0 :   mRasterUnitsPerPixelX = layer->rasterUnitsPerPixelX();
      98                 :          0 :   mRasterUnitsPerPixelY = layer->rasterUnitsPerPixelY();
      99                 :          0 :   mSource = layer->source();
     100                 :            : 
     101                 :          0 :   return true;
     102                 :          0 : }
     103                 :            : 
     104                 :          0 : QVariantMap QgsRasterLayerUniqueValuesReportAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
     105                 :            : {
     106                 :          0 :   QString outputFile = parameterAsFileOutput( parameters, QStringLiteral( "OUTPUT_HTML_FILE" ), context );
     107                 :            : 
     108                 :          0 :   QString areaUnit = QgsUnitTypes::toAbbreviatedString( QgsUnitTypes::distanceToAreaUnit( mCrs.mapUnits() ) );
     109                 :            : 
     110                 :          0 :   QString tableDest;
     111                 :          0 :   std::unique_ptr< QgsFeatureSink > sink;
     112                 :          0 :   if ( parameters.contains( QStringLiteral( "OUTPUT_TABLE" ) ) && parameters.value( QStringLiteral( "OUTPUT_TABLE" ) ).isValid() )
     113                 :            :   {
     114                 :          0 :     QgsFields outFields;
     115                 :          0 :     outFields.append( QgsField( QStringLiteral( "value" ), QVariant::Double, QString(), 20, 8 ) );
     116                 :          0 :     outFields.append( QgsField( QStringLiteral( "count" ), QVariant::Int, QString(), 20 ) );
     117                 :          0 :     outFields.append( QgsField( areaUnit.replace( QStringLiteral( "²" ), QStringLiteral( "2" ) ), QVariant::Double, QString(), 20, 8 ) );
     118                 :          0 :     sink.reset( parameterAsSink( parameters, QStringLiteral( "OUTPUT_TABLE" ), context, tableDest, outFields, QgsWkbTypes::NoGeometry, QgsCoordinateReferenceSystem() ) );
     119                 :          0 :     if ( !sink )
     120                 :          0 :       throw QgsProcessingException( invalidSinkError( parameters, QStringLiteral( "OUTPUT_TABLE" ) ) );
     121                 :          0 :   }
     122                 :            : 
     123                 :          0 :   QHash< double, qgssize > uniqueValues;
     124                 :          0 :   qgssize noDataCount = 0;
     125                 :            : 
     126                 :          0 :   qgssize layerSize = static_cast< qgssize >( mLayerWidth ) * static_cast< qgssize >( mLayerHeight );
     127                 :          0 :   int maxWidth = QgsRasterIterator::DEFAULT_MAXIMUM_TILE_WIDTH;
     128                 :          0 :   int maxHeight = QgsRasterIterator::DEFAULT_MAXIMUM_TILE_HEIGHT;
     129                 :          0 :   int nbBlocksWidth = std::ceil( 1.0 * mLayerWidth / maxWidth );
     130                 :          0 :   int nbBlocksHeight = std::ceil( 1.0 * mLayerHeight / maxHeight );
     131                 :          0 :   int nbBlocks = nbBlocksWidth * nbBlocksHeight;
     132                 :            : 
     133                 :          0 :   QgsRasterIterator iter( mInterface.get() );
     134                 :          0 :   iter.startRasterRead( mBand, mLayerWidth, mLayerHeight, mExtent );
     135                 :            : 
     136                 :          0 :   int iterLeft = 0;
     137                 :          0 :   int iterTop = 0;
     138                 :          0 :   int iterCols = 0;
     139                 :          0 :   int iterRows = 0;
     140                 :          0 :   bool isNoData = false;
     141                 :          0 :   std::unique_ptr< QgsRasterBlock > rasterBlock;
     142                 :          0 :   while ( iter.readNextRasterPart( mBand, iterCols, iterRows, rasterBlock, iterLeft, iterTop ) )
     143                 :            :   {
     144                 :          0 :     feedback->setProgress( 100 * ( ( iterTop / maxHeight * nbBlocksWidth ) + iterLeft / maxWidth ) / nbBlocks );
     145                 :          0 :     for ( int row = 0; row < iterRows; row++ )
     146                 :            :     {
     147                 :          0 :       if ( feedback->isCanceled() )
     148                 :          0 :         break;
     149                 :          0 :       for ( int column = 0; column < iterCols; column++ )
     150                 :            :       {
     151                 :          0 :         double value = rasterBlock->valueAndNoData( row, column, isNoData );
     152                 :          0 :         if ( mHasNoDataValue && isNoData )
     153                 :            :         {
     154                 :          0 :           noDataCount++;
     155                 :          0 :         }
     156                 :            :         else
     157                 :            :         {
     158                 :          0 :           uniqueValues[ value ]++;
     159                 :            :         }
     160                 :          0 :       }
     161                 :          0 :     }
     162                 :            :   }
     163                 :            : 
     164                 :          0 :   QMap< double, qgssize > sortedUniqueValues;
     165                 :          0 :   for ( auto it = uniqueValues.constBegin(); it != uniqueValues.constEnd(); ++it )
     166                 :            :   {
     167                 :          0 :     sortedUniqueValues.insert( it.key(), it.value() );
     168                 :          0 :   }
     169                 :            : 
     170                 :          0 :   QVariantMap outputs;
     171                 :          0 :   outputs.insert( QStringLiteral( "EXTENT" ), mExtent.toString() );
     172                 :          0 :   outputs.insert( QStringLiteral( "CRS_AUTHID" ), mCrs.authid() );
     173                 :          0 :   outputs.insert( QStringLiteral( "WIDTH_IN_PIXELS" ), mLayerWidth );
     174                 :          0 :   outputs.insert( QStringLiteral( "HEIGHT_IN_PIXELS" ), mLayerHeight );
     175                 :          0 :   outputs.insert( QStringLiteral( "TOTAL_PIXEL_COUNT" ), layerSize );
     176                 :          0 :   outputs.insert( QStringLiteral( "NODATA_PIXEL_COUNT" ), noDataCount );
     177                 :            : 
     178                 :          0 :   double pixelArea = mRasterUnitsPerPixelX * mRasterUnitsPerPixelY;
     179                 :            : 
     180                 :          0 :   if ( !outputFile.isEmpty() )
     181                 :            :   {
     182                 :          0 :     QFile file( outputFile );
     183                 :          0 :     if ( file.open( QIODevice::WriteOnly | QIODevice::Text ) )
     184                 :            :     {
     185                 :          0 :       const QString encodedAreaUnit = QgsStringUtils::ampersandEncode( areaUnit );
     186                 :            : 
     187                 :          0 :       QTextStream out( &file );
     188                 :          0 :       out << QStringLiteral( "<html><head><meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\"/></head><body>\n" );
     189                 :          0 :       out << QStringLiteral( "<p>%1: %2 (%3 %4)</p>\n" ).arg( QObject::tr( "Analyzed file" ), mSource, QObject::tr( "band" ) ).arg( mBand );
     190                 :          0 :       out << QObject::tr( "<p>%1: %2</p>\n" ).arg( QObject::tr( "Extent" ), mExtent.toString() );
     191                 :          0 :       out << QObject::tr( "<p>%1: %2</p>\n" ).arg( QObject::tr( "Projection" ), mCrs.userFriendlyIdentifier() );
     192                 :          0 :       out << QObject::tr( "<p>%1: %2 (%3 %4)</p>\n" ).arg( QObject::tr( "Width in pixels" ) ).arg( mLayerWidth ).arg( QObject::tr( "units per pixel" ) ).arg( mRasterUnitsPerPixelX );
     193                 :          0 :       out << QObject::tr( "<p>%1: %2 (%3 %4)</p>\n" ).arg( QObject::tr( "Height in pixels" ) ).arg( mLayerHeight ).arg( QObject::tr( "units per pixel" ) ).arg( mRasterUnitsPerPixelY );
     194                 :          0 :       out << QObject::tr( "<p>%1: %2</p>\n" ).arg( QObject::tr( "Total pixel count" ) ).arg( layerSize );
     195                 :          0 :       if ( mHasNoDataValue )
     196                 :          0 :         out << QObject::tr( "<p>%1: %2</p>\n" ).arg( QObject::tr( "NODATA pixel count" ) ).arg( noDataCount );
     197                 :          0 :       out << QStringLiteral( "<table><tr><td>%1</td><td>%2</td><td>%3 (%4)</td></tr>\n" ).arg( QObject::tr( "Value" ), QObject::tr( "Pixel count" ), QObject::tr( "Area" ), encodedAreaUnit );
     198                 :            : 
     199                 :          0 :       for ( auto it = sortedUniqueValues.constBegin(); it != sortedUniqueValues.constEnd(); ++it )
     200                 :            :       {
     201                 :          0 :         double area = it.value() * pixelArea;
     202                 :          0 :         out << QStringLiteral( "<tr><td>%1</td><td>%2</td><td>%3</td></tr>\n" ).arg( it.key() ).arg( it.value() ).arg( QString::number( area, 'g', 16 ) );
     203                 :          0 :       }
     204                 :          0 :       out << QStringLiteral( "</table>\n</body></html>" );
     205                 :          0 :       outputs.insert( QStringLiteral( "OUTPUT_HTML_FILE" ), outputFile );
     206                 :          0 :     }
     207                 :          0 :   }
     208                 :            : 
     209                 :          0 :   if ( sink )
     210                 :            :   {
     211                 :          0 :     for ( auto it = sortedUniqueValues.constBegin(); it != sortedUniqueValues.constEnd(); ++it )
     212                 :            :     {
     213                 :          0 :       QgsFeature f;
     214                 :          0 :       double area = it.value() * pixelArea;
     215                 :          0 :       f.setAttributes( QgsAttributes() << it.key() << it.value() << area );
     216                 :          0 :       sink->addFeature( f, QgsFeatureSink::FastInsert );
     217                 :          0 :     }
     218                 :          0 :     outputs.insert( QStringLiteral( "OUTPUT_TABLE" ), tableDest );
     219                 :          0 :   }
     220                 :            : 
     221                 :          0 :   return outputs;
     222                 :          0 : }
     223                 :            : 
     224                 :            : 
     225                 :            : ///@endcond
     226                 :            : 
     227                 :            : 
     228                 :            : 

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