I've built the following heatmap using QGis 2.8.2's Raster->Interpolation feature. It looks almost the way I want:

enter image description here

The background layer is Google Maps tiles by using the OpenLayers plugin.

However, as you may see, the outer edges abruptly end, since it's basically a rectangle. I would to produce an output that would not crop the edges like this and would give a more organic output, following the outer points, like the following:

enter image description here

Does anyone know how could I accomplish this with QGis and or related tools?

  • Where did the bottom image come from?
    – TsvGis
    Jul 26, 2015 at 3:50
  • I found this post about heatmaps. He uses a heat map plugin that does seem to get the organic shape you are after - see point 12 in the link provided.
    – TsvGis
    Jul 26, 2015 at 3:56
  • I drew it using Photoshop. It's just a way to communicate how I want it to look like. Thanks for the link! I'll try it out and let you know if it suits my needs. Jul 26, 2015 at 6:44
  • TsvGis, the heatmap plugin doesn't quite create the kind of viz. I want. It looks better suited for heatmaps that represent density of points. The interpolation feature actually creates a better viz. for what I want. The missing piece now is, how to clip the outer edges to the contour, instead of cropping to a rectangle like it usually does? Jul 27, 2015 at 17:19
  • I guess I will have to somehow clip the raster. I just don't know how, yet. Jul 28, 2015 at 0:38

1 Answer 1


Google Map using heatmap, not interpolation, its quite different. Layer heatmap is colored with point by point data, more data that you have in such area, more intend colour will be showed

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