Hi, okay, first part. In my testing it turned out, that the SizeFilter and the DouglasPeuckerFilter either dropped my small rectangles or converted them to a triangle. Removing the filters fixed this for me. If you think, that the generated rectangles should be large enough, so that they're not "cleaned": - If this is so, then there really is no reason for calling the filters anyway, they should be NOPs in that case. So we can optimize them away. - I hope to show in later patches (don't hold your breath! I will go slowly step by step. There is no need to hurry anyway) that smaller rects might make some sense. So this simple patch disables both filters for the overview map. If nobody objects or I get some "Go", I'll commit it soon. Elrond