qgis/Quantum-GIS — pull request #471 by nyalldawson (2013-03-18 02:05:38+00:00)
Title: [FEATURE] Add additional kernels to the Heatmap plugin...

... and set the default kernel to a Quartic/Biweight kernel.
Fix the maths for triangular kernels.
Move the decay widget into the advanced section and disable it for all kernel shapes except Triangular. Default to a decay of zero.
Add references for all kernel functions and explanation of how they are derived.