Hi Marcello, thanks for this idea. I tried it out and the overlay maintains its quality even when you zoom in quite hard. The trouble is google maps stops showing the ground overlay when you exceed a certain zoom. It seems to stop showing the overlay when the percentage of the ground overlay that is visible falls below a certain point. I've tried generating overlays at different pixel resolutions but this has no effect. For example, with a ground overlay image that covers the whole of Scotland, on my browser all of the overlay is visible at zoom 6. As I zoom in the overlay is still visible at zoom 11 and the different coloured regions on my overlay are still quite distinct. However when I get to zoom 12 the overlay suddenly disappears. This is a shame as a gradual reduction in overlay quality as you zoom in would be preferable to this abupt cut-off. It seems that you can add more than one ground overlay so I could get over this problem by adding several overlay tiles. Unfortunately this is not feasible as doing this really slows things down. I recon I'll just go back to the image tilling - with an overnight run I can generate tiles upto zoom14. Thanks, Duncan
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