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[Backport release-3_40] Fix normalising constant in quartic kernel #60633

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Feb 17, 2025
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[Backport release-3_40] Fix normalising constant in quartic kernel #60633

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2 changes: 1 addition & 1 deletion src/analysis/raster/qgskde.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -315,7 +315,7 @@ double QgsKernelDensityEstimation::quarticKernel( const double distance, const d
case OutputScaled:
{
// Normalizing constant
const double k = 116. / ( 5. * M_PI * std::pow( bandwidth, 2 ) );
const double k = 16. / ( 5. * M_PI * std::pow( bandwidth, 2 ) );

// Derived from Wand and Jones (1995), p. 175
return k * ( 15. / 16. ) * std::pow( 1. - std::pow( distance / bandwidth, 2 ), 2 );
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