I'm currently working with osm-data. Each feature is getting a new attribute as a weighting. I do already have done the whole weighting and am just trying to visualize the results. The best visulaization would be to create some kind of a heatmap based on that data, but I'm not quite sure how to do so.

The first approach of me was to create areas for the different weightings using the HullAccumulator with a Concave setting. It seems to work, but I'm not having the color graduiation of a real heatmap. The second approach was to use the MapnikRasterizer which leads to a better result, but it does still look aweful.