How can I create a heat map (some would call a density map) from a points layer in MapServer (or GeoServer)?
(preferably able to choose Interpolation method, NN, IDW, etc and color map with a transparent color)
The points are stored in PostGIS table and the table is dynamic, meaning I need to create the heat map on the fly.
Best Answer
Step-by-step for GeoServer. Note: As @michal-mackiewicz writes, the WPS extension for GeoServer must be installed.
Save the edited SLD as name "heatmap" with the SLD editor of the GeoServer admin utility.
The rest is fine tuning the heatmap parameters and color ramp by editing the SLD. After the SLD file is saved the next pan or zoom on the map will show the effect of the edit.