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Maybe you would like to try a different way. First you can generate an empty vector grid like a fishnet (Vector > Research Tools > Vector Grid (Output Grid as Polygons!)), then you can make a spatial join (Vector > Data Management Tools > Join Attributes by Location (Take summary of intersecting features! > you will need the COUNT Field in the result shape ...


In WebGIS, algorithms which require intensive computing, like heatmap with a mask are not recommended to do on the client side. As the data source changes rapidly, the easiest way would be to render the whole as a heatmap layer and mask it with a WMS layer. The WMS should only have landmass data, and the transparency should be set to true. An example can be ...

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