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Thanks for your answer! The solution I found more appropriate and clean is using Canvas indeed I paste the key part of the code. - Icon variable is the key for Google Map - The call back is a function that takes the variable Marker (since the construction of Canvases can be asynchronous.) var canvas = document.createElement("canvas"); ...


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EDIT: Im going to expand my answer further, but unfortuneately I don't have the time to put together a coherent and concise code example. Links will have to do for now :) Regarding the 3 options above: Covering the marker with anything is hard, since this will be rendered in canvas and you would probably go down the route of an overlay anyway, so: Work ...


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You have the union tag in your question all that is missing is adding an attribute for the colour you want to each layer before doing the union. The results will have a lot of spurious slivers. You say you have polygons but also that you are using raster calculator - a raster approach might be better but again you need to get your values sorted in the data ...



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