Class: QgsKernelDensityEstimation¶
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class
qgis.analysis.
QgsKernelDensityEstimation
(parameters: QgsKernelDensityEstimation.Parameters, outputFile: str, outputFormat: str)¶ Bases:
sip.wrapper
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.
Performs Kernel Density Estimation (“heatmap”) calculations on a vector layer.
New in version 3.0: Enums
Methods
Adds a single feature to the KDE surface.
Finalises the output file.
Prepares the output file for writing and setups up the surface calculation.
Runs the KDE calculation across the whole layer at once.
Signals
Attributes
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DriverError
= 1¶
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FileCreationError
= 3¶
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InvalidParameters
= 2¶
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KernelEpanechnikov
= 4¶
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KernelQuartic
= 0¶
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class
KernelShape
¶ Bases:
int
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KernelTriangular
= 1¶
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KernelTriweight
= 3¶
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KernelUniform
= 2¶
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OutputRaw
= 0¶
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OutputScaled
= 1¶
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class
OutputValues
¶ Bases:
int
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class
Parameters
¶ Bases:
sip.wrapper
QgsKernelDensityEstimation.Parameters(QgsKernelDensityEstimation.Parameters)
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decayRatio
¶
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outputValues
¶
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pixelSize
¶
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radius
¶
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radiusField
¶
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shape
¶
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source
¶
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weightField
¶
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RasterIoError
= 4¶
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class
Result
¶ Bases:
int
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Success
= 0¶
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addFeature
(self, feature: QgsFeature) → QgsKernelDensityEstimation.Result¶ Adds a single feature to the KDE surface. prepare() must be called before adding features.
See also
See also
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finalise
(self) → QgsKernelDensityEstimation.Result¶ Finalises the output file. Must be called after adding all features via addFeature().
See also
See also
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prepare
(self) → QgsKernelDensityEstimation.Result¶ Prepares the output file for writing and setups up the surface calculation. This must be called before adding features via addFeature().
See also
See also
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run
(self) → QgsKernelDensityEstimation.Result¶ Runs the KDE calculation across the whole layer at once. Either call this method, or manually call run(), addFeature() and finalise() separately.
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