Try https://github.com/fredj/openlayers-heatmap. https://github.com/fredj/openlayers-heatmap Not much documentation but the example is maybe suffisant: http://fredj.github.com/openlayers-heatmap/examples/heatmap.html

Try https://github.com/fredj/openlayers-heatmap. Not much documentation but the example is maybe suffisant (http://fredj.github.com/openlayers-heatmap/examples/heatmap.html)suffisant: http://fredj.github.com/openlayers-heatmap/examples/heatmap.html

Try https://github.com/fredj/openlayers-heatmap. Not much documentation but the example is maybe suffisant (http://fredj.github.com/openlayers-heatmap/examples/heatmap.html)