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[FEATURE] New algorithm for creating vector layer from raster layer's…
… extent Allows creation of a new vector layer with a single feature containing a raster layer's extent. Previously this was only possible for vector layers.
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| # -*- coding: utf-8 -*- | ||
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| """ | ||
| *************************************************************************** | ||
| ExtentFromRasterLayer.py | ||
| --------------------- | ||
| Date : August 2017 | ||
| Copyright : (C) 2017 by Nyall Dawson | ||
| Email : nyall dot dawson at gmail dot com | ||
| *************************************************************************** | ||
| * * | ||
| * This program is free software; you can redistribute it and/or modify * | ||
| * it under the terms of the GNU General Public License as published by * | ||
| * the Free Software Foundation; either version 2 of the License, or * | ||
| * (at your option) any later version. * | ||
| * * | ||
| *************************************************************************** | ||
| """ | ||
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| __author__ = 'Nyall Dawson' | ||
| __date__ = 'August 2017' | ||
| __copyright__ = '(C) 2017, Nyall Dawson' | ||
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| # This will get replaced with a git SHA1 when you do a git archive | ||
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| __revision__ = '$Format:%H$' | ||
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| import os | ||
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| from qgis.PyQt.QtGui import QIcon | ||
| from qgis.PyQt.QtCore import QVariant | ||
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| from qgis.core import (QgsField, | ||
| QgsFeatureSink, | ||
| QgsPointXY, | ||
| QgsGeometry, | ||
| QgsFeature, | ||
| QgsWkbTypes, | ||
| QgsProcessing, | ||
| QgsProcessingParameterRasterLayer, | ||
| QgsProcessingParameterFeatureSink, | ||
| QgsFields) | ||
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| from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm | ||
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| pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0] | ||
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| class ExtentFromRasterLayer(QgisAlgorithm): | ||
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| INPUT = 'INPUT' | ||
| OUTPUT = 'OUTPUT' | ||
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| def icon(self): | ||
| return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'layer_extent.png')) | ||
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| def tags(self): | ||
| return self.tr('extent,envelope,bounds,bounding,boundary,layer').split(',') | ||
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| def group(self): | ||
| return self.tr('Raster tools') | ||
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| def __init__(self): | ||
| super().__init__() | ||
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| def initAlgorithm(self, config=None): | ||
| self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT, self.tr('Input layer'))) | ||
| self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Extent'), type=QgsProcessing.TypeVectorPolygon)) | ||
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| def name(self): | ||
| return 'polygonfromrasterextent' | ||
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| def displayName(self): | ||
| return self.tr('Polygon from raster extent') | ||
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| def processAlgorithm(self, parameters, context, feedback): | ||
| raster = self.parameterAsRasterLayer(parameters, self.INPUT, context) | ||
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| fields = QgsFields() | ||
| fields.append(QgsField('MINX', QVariant.Double)) | ||
| fields.append(QgsField('MINY', QVariant.Double)) | ||
| fields.append(QgsField('MAXX', QVariant.Double)) | ||
| fields.append(QgsField('MAXY', QVariant.Double)) | ||
| fields.append(QgsField('CNTX', QVariant.Double)) | ||
| fields.append(QgsField('CNTY', QVariant.Double)) | ||
| fields.append(QgsField('AREA', QVariant.Double)) | ||
| fields.append(QgsField('PERIM', QVariant.Double)) | ||
| fields.append(QgsField('HEIGHT', QVariant.Double)) | ||
| fields.append(QgsField('WIDTH', QVariant.Double)) | ||
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| (sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context, | ||
| fields, QgsWkbTypes.Polygon, raster.crs()) | ||
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| self.layerExtent(raster, sink, feedback) | ||
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| return {self.OUTPUT: dest_id} | ||
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| def layerExtent(self, raster, sink, feedback): | ||
| rect = raster.extent() | ||
| geometry = QgsGeometry.fromRect(rect) | ||
| minx = rect.xMinimum() | ||
| miny = rect.yMinimum() | ||
| maxx = rect.xMaximum() | ||
| maxy = rect.yMaximum() | ||
| height = rect.height() | ||
| width = rect.width() | ||
| cntx = minx + width / 2.0 | ||
| cnty = miny + height / 2.0 | ||
| area = width * height | ||
| perim = 2 * width + 2 * height | ||
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| feat = QgsFeature() | ||
| feat.setGeometry(geometry) | ||
| attrs = [ | ||
| minx, | ||
| miny, | ||
| maxx, | ||
| maxy, | ||
| cntx, | ||
| cnty, | ||
| area, | ||
| perim, | ||
| height, | ||
| width, | ||
| ] | ||
| feat.setAttributes(attrs) | ||
| sink.addFeature(feat, QgsFeatureSink.FastInsert) |
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| Original file line number | Diff line number | Diff line change |
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| <GMLFeatureClassList> | ||
| <GMLFeatureClass> | ||
| <Name>raster_extent</Name> | ||
| <ElementPath>raster_extent</ElementPath> | ||
| <!--POLYGON--> | ||
| <GeometryType>3</GeometryType> | ||
| <SRSName>EPSG:4326</SRSName> | ||
| <DatasetSpecificInfo> | ||
| <FeatureCount>1</FeatureCount> | ||
| <ExtentXMin>18.66630</ExtentXMin> | ||
| <ExtentXMax>18.70360</ExtentXMax> | ||
| <ExtentYMin>45.77670</ExtentYMin> | ||
| <ExtentYMax>45.81170</ExtentYMax> | ||
| </DatasetSpecificInfo> | ||
| <PropertyDefn> | ||
| <Name>MINX</Name> | ||
| <ElementPath>MINX</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>MINY</Name> | ||
| <ElementPath>MINY</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>MAXX</Name> | ||
| <ElementPath>MAXX</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>MAXY</Name> | ||
| <ElementPath>MAXY</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>CNTX</Name> | ||
| <ElementPath>CNTX</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>CNTY</Name> | ||
| <ElementPath>CNTY</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>AREA</Name> | ||
| <ElementPath>AREA</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>PERIM</Name> | ||
| <ElementPath>PERIM</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>HEIGHT</Name> | ||
| <ElementPath>HEIGHT</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| <PropertyDefn> | ||
| <Name>WIDTH</Name> | ||
| <ElementPath>WIDTH</ElementPath> | ||
| <Type>Real</Type> | ||
| </PropertyDefn> | ||
| </GMLFeatureClass> | ||
| </GMLFeatureClassList> |
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| <?xml version="1.0" encoding="utf-8" ?> | ||
| <ogr:FeatureCollection | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="" | ||
| xmlns:ogr="http://ogr.maptools.org/" | ||
| xmlns:gml="http://www.opengis.net/gml"> | ||
| <gml:boundedBy> | ||
| <gml:Box> | ||
| <gml:coord><gml:X>18.6662979442</gml:X><gml:Y>45.7767014376</gml:Y></gml:coord> | ||
| <gml:coord><gml:X>18.7035979442</gml:X><gml:Y>45.8117014376</gml:Y></gml:coord> | ||
| </gml:Box> | ||
| </gml:boundedBy> | ||
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| <gml:featureMember> | ||
| <ogr:raster_extent fid="raster_extent.0"> | ||
| <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>18.6662979442,45.7767014376 18.7035979442,45.7767014376 18.7035979442,45.8117014376 18.6662979442,45.8117014376 18.6662979442,45.7767014376</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty> | ||
| <ogr:MINX>18.6662979442</ogr:MINX> | ||
| <ogr:MINY>45.7767014376</ogr:MINY> | ||
| <ogr:MAXX>18.7035979442</ogr:MAXX> | ||
| <ogr:MAXY>45.8117014376</ogr:MAXY> | ||
| <ogr:CNTX>18.6849479442</ogr:CNTX> | ||
| <ogr:CNTY>45.7942014376</ogr:CNTY> | ||
| <ogr:AREA>0.00130549999999981</ogr:AREA> | ||
| <ogr:PERIM>0.14459999999999</ogr:PERIM> | ||
| <ogr:HEIGHT>0.0349999999999966</ogr:HEIGHT> | ||
| <ogr:WIDTH>0.0372999999999983</ogr:WIDTH> | ||
| </ogr:raster_extent> | ||
| </gml:featureMember> | ||
| </ogr:FeatureCollection> |
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