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Merge pull request #3782 from nyalldawson/heatmap
Port heatmap plugin code to analysis, add processing alg
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /** | ||
| * \class QgsKernelDensityEstimation | ||
| * \ingroup analysis | ||
| * Performs Kernel Density Estimation ("heatmap") calculations on a vector layer. | ||
| * @note added in QGIS 3.0 | ||
| */ | ||
| class QgsKernelDensityEstimation | ||
| { | ||
| %TypeHeaderCode | ||
| #include <qgskde.h> | ||
| %End | ||
|
|
||
| public: | ||
|
|
||
| //! Kernel shape type | ||
| enum KernelShape | ||
| { | ||
| KernelQuartic, //!< Quartic kernel | ||
| KernelTriangular, //!< Triangular kernel | ||
| KernelUniform, //!< Uniform (flat) kernel | ||
| KernelTriweight, //!< Triweight kernel | ||
| KernelEpanechnikov, //!< Epanechnikov kernel | ||
| }; | ||
|
|
||
| //! Output values type | ||
| enum OutputValues | ||
| { | ||
| OutputRaw, //!< Output the raw KDE values | ||
| OutputScaled, //!< Output mathematically correct scaled values | ||
| }; | ||
|
|
||
| //! Result of operation | ||
| enum Result | ||
| { | ||
| Success, //!< Operation completed successfully | ||
| DriverError, //!< Could not open the driver for the specified format | ||
| InvalidParameters, //!< Input parameters were not valid | ||
| FileCreationError, //!< Error creating output file | ||
| RasterIoError, //!< Error writing to raster | ||
| }; | ||
|
|
||
| //! KDE parameters | ||
| struct Parameters | ||
| { | ||
| //! Vector point layer | ||
| QgsVectorLayer* vectorLayer; | ||
|
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| //! Fixed radius, in map units | ||
| double radius; | ||
|
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| //! Field for radius, or empty if using a fixed radius | ||
| QString radiusField; | ||
|
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| //! Field name for weighting field, or empty if not using weights | ||
| QString weightField; | ||
|
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| //! Size of pixel in output file | ||
| double pixelSize; | ||
|
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||
| //! Kernel shape | ||
| QgsKernelDensityEstimation::KernelShape shape; | ||
|
|
||
| //! Decay ratio (Triangular kernels only) | ||
| double decayRatio; | ||
|
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| //! Type of output value | ||
| QgsKernelDensityEstimation::OutputValues outputValues; | ||
| }; | ||
|
|
||
| /** | ||
| * Constructor for QgsKernelDensityEstimation. Requires a Parameters object specifying the options to use | ||
| * to generate the surface. The output path and file format are also required. | ||
| */ | ||
| QgsKernelDensityEstimation( const Parameters& parameters, const QString& outputFile, const QString& outputFormat ); | ||
|
|
||
| /** | ||
| * Runs the KDE calculation across the whole layer at once. Either call this method, or manually | ||
| * call run(), addFeature() and finalise() separately. | ||
| */ | ||
| Result run(); | ||
|
|
||
| /** | ||
| * Prepares the output file for writing and setups up the surface calculation. This must be called | ||
| * before adding features via addFeature(). | ||
| * @see addFeature() | ||
| * @see finalise() | ||
| */ | ||
| Result prepare(); | ||
|
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||
| /** | ||
| * Adds a single feature to the KDE surface. prepare() must be called before adding features. | ||
| * @see prepare() | ||
| * @see finalise() | ||
| */ | ||
| Result addFeature( const QgsFeature& feature ); | ||
|
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||
| /** | ||
| * Finalises the output file. Must be called after adding all features via addFeature(). | ||
| * @see prepare() | ||
| * @see addFeature() | ||
| */ | ||
| Result finalise(); | ||
|
|
||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| # -*- coding: utf-8 -*- | ||
|
|
||
| """ | ||
| *************************************************************************** | ||
| Heatmap.py | ||
| --------------------- | ||
| Date : November 2016 | ||
| Copyright : (C) 2016 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__ = 'November 2016' | ||
| __copyright__ = '(C) 2016, 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 | ||
|
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| from qgis.core import QgsFeatureRequest | ||
| from qgis.analysis import QgsKernelDensityEstimation | ||
|
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||
| from processing.core.GeoAlgorithm import GeoAlgorithm | ||
| from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException | ||
| from processing.core.parameters import ParameterVector | ||
| from processing.core.parameters import ParameterNumber | ||
| from processing.core.parameters import ParameterSelection | ||
| from processing.core.parameters import ParameterTableField | ||
| from processing.core.outputs import OutputRaster | ||
| from processing.tools import dataobjects, vector, raster | ||
| from processing.algs.qgis.ui.HeatmapWidgets import HeatmapPixelSizeWidgetWrapper | ||
|
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||
| pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0] | ||
|
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|
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| class Heatmap(GeoAlgorithm): | ||
|
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| INPUT_LAYER = 'INPUT_LAYER' | ||
| RADIUS = 'RADIUS' | ||
| RADIUS_FIELD = 'RADIUS_FIELD' | ||
| WEIGHT_FIELD = 'WEIGHT_FIELD' | ||
| PIXEL_SIZE = 'PIXEL_SIZE' | ||
|
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| KERNELS = ['Quartic', | ||
| 'Triangular', | ||
| 'Uniform', | ||
| 'Triweight', | ||
| 'Epanechnikov' | ||
| ] | ||
| KERNEL = 'KERNEL' | ||
| DECAY = 'DECAY' | ||
| OUTPUT_VALUES = ['Raw', | ||
| 'Scaled' | ||
| ] | ||
| OUTPUT_VALUE = 'OUTPUT_VALUE' | ||
| OUTPUT_LAYER = 'OUTPUT_LAYER' | ||
|
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| def getIcon(self): | ||
| return QIcon(os.path.join(pluginPath, 'images', 'heatmap.png')) | ||
|
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| def defineCharacteristics(self): | ||
| self.name, self.i18n_name = self.trAlgorithm('Heatmap (Kernel Density Estimation)') | ||
| self.group, self.i18n_group = self.trAlgorithm('Interpolation') | ||
| self.tags = self.tr('heatmap,kde,hotspot') | ||
|
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||
| self.addParameter(ParameterVector(self.INPUT_LAYER, | ||
| self.tr('Point layer'), [dataobjects.TYPE_VECTOR_POINT])) | ||
| self.addParameter(ParameterNumber(self.RADIUS, | ||
| self.tr('Radius (layer units)'), | ||
| 0.0, 9999999999, 100.0)) | ||
|
|
||
| self.addParameter(ParameterTableField(self.RADIUS_FIELD, | ||
| self.tr('Radius from field'), self.INPUT_LAYER, optional=True, datatype=ParameterTableField.DATA_TYPE_NUMBER)) | ||
|
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| class ParameterHeatmapPixelSize(ParameterNumber): | ||
|
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| def __init__(self, name='', description='', parent_layer=None, radius_param=None, radius_field_param=None, minValue=None, maxValue=None, | ||
| default=None, optional=False, metadata={}): | ||
| ParameterNumber.__init__(self, name, description, minValue, maxValue, default, optional, metadata) | ||
| self.parent_layer = parent_layer | ||
| self.radius_param = radius_param | ||
| self.radius_field_param = radius_field_param | ||
|
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||
| self.addParameter(ParameterHeatmapPixelSize(self.PIXEL_SIZE, | ||
| self.tr('Output raster size'), parent_layer=self.INPUT_LAYER, radius_param=self.RADIUS, | ||
| radius_field_param=self.RADIUS_FIELD, | ||
| minValue=0.0, maxValue=9999999999, default=0.1, | ||
| metadata={'widget_wrapper': HeatmapPixelSizeWidgetWrapper})) | ||
|
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| self.addParameter(ParameterTableField(self.WEIGHT_FIELD, | ||
| self.tr('Weight from field'), self.INPUT_LAYER, optional=True, datatype=ParameterTableField.DATA_TYPE_NUMBER)) | ||
| self.addParameter(ParameterSelection(self.KERNEL, | ||
| self.tr('Kernel shape'), self.KERNELS)) | ||
| self.addParameter(ParameterNumber(self.DECAY, | ||
| self.tr('Decay ratio (Triangular kernels only)'), | ||
| -100.0, 100.0, 0.0)) | ||
| self.addParameter(ParameterSelection(self.OUTPUT_VALUE, | ||
| self.tr('Output value scaling'), self.OUTPUT_VALUES)) | ||
| self.addOutput(OutputRaster(self.OUTPUT_LAYER, | ||
| self.tr('Heatmap'))) | ||
|
|
||
| def processAlgorithm(self, progress): | ||
| layer = dataobjects.getObjectFromUri( | ||
| self.getParameterValue(self.INPUT_LAYER)) | ||
|
|
||
| radius = self.getParameterValue(self.RADIUS) | ||
| kernel_shape = self.getParameterValue(self.KERNEL) | ||
| pixel_size = self.getParameterValue(self.PIXEL_SIZE) | ||
| decay = self.getParameterValue(self.DECAY) | ||
| output_values = self.getParameterValue(self.OUTPUT_VALUE) | ||
| output = self.getOutputValue(self.OUTPUT_LAYER) | ||
| output_format = raster.formatShortNameFromFileName(output) | ||
| weight_field = self.getParameterValue(self.WEIGHT_FIELD) | ||
| radius_field = self.getParameterValue(self.RADIUS_FIELD) | ||
|
|
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| attrs = [] | ||
|
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| kde_params = QgsKernelDensityEstimation.Parameters() | ||
| kde_params.vectorLayer = layer | ||
| kde_params.radius = radius | ||
| kde_params.pixelSize = pixel_size | ||
| # radius field | ||
| if radius_field: | ||
| kde_params.radiusField = radius_field | ||
| attrs.append(layer.fields().lookupField(radius_field)) | ||
| # weight field | ||
| if weight_field: | ||
| kde_params.weightField = weight_field | ||
| attrs.append(layer.fields().lookupField(weight_field)) | ||
|
|
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| kde_params.shape = kernel_shape | ||
| kde_params.decayRatio = decay | ||
| kde_params.outputValues = output_values | ||
|
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| kde = QgsKernelDensityEstimation(kde_params, output, output_format) | ||
|
|
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| if kde.prepare() != QgsKernelDensityEstimation.Success: | ||
| raise GeoAlgorithmExecutionException( | ||
| self.tr('Could not create destination layer')) | ||
|
|
||
| request = QgsFeatureRequest() | ||
| request.setSubsetOfAttributes(attrs) | ||
| features = vector.features(layer, request) | ||
| total = 100.0 / len(features) | ||
| for current, f in enumerate(features): | ||
| if kde.addFeature(f) != QgsKernelDensityEstimation.Success: | ||
| raise GeoAlgorithmExecutionException( | ||
| self.tr('Error adding feature to heatmap')) | ||
|
|
||
| progress.setPercentage(int(current * total)) | ||
|
|
||
| if kde.finalise() != QgsKernelDensityEstimation.Success: | ||
| raise GeoAlgorithmExecutionException( | ||
| self.tr('Could not save destination layer')) |
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