I've built the following heatmap using
Raster->Interpolation feature. It looks almost the way I want:
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:
Does anyone know how could I accomplish this with QGis and or related tools?