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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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127
python/plugins/processing/algs/qgis/ExtentFromRasterLayer.py
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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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66 changes: 66 additions & 0 deletions
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python/plugins/processing/tests/testdata/expected/raster_extent.gfs
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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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python/plugins/processing/tests/testdata/expected/raster_extent.gml
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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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