MapGlow enables displaying your (vector) geodata as heatmaps via the standard WMS protocol.
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README.md

MapGlow enables displaying your geodata as heatmaps. See more at http://mapglow.org. MapGlow is currently a Python MapScript addition to UMN MapServer It intercepts WMS GetMap and GetLegendGraphic requests for heatmap generation from MapServer Layer Vector (Point-type) sources when the STYLE(S) parameter starts with the magic word "heat". In that case MapGlow will query the MS Layer feature data and draw a transparent overlay heatmap. The STYLES parameter also determines the parametrization of how the heatmap should be drawn in terms of gradient colors and other parameters. MapGlow will delegate processing to the standard MapServer OWS dispatching for other requests like GetCapabilities or when no STYLE(S) parameter is provided.