Hi Andrzej, I don't understand the solutions :-( My problem is that the jagged data from the overview map doesn't disappear when I zoom in near the boundary. My ideas: 1) don't add DEM to overview map (a work around) 2) use a slightly smaller polygon when calculating DEM for overview map, so that the nicer data from the tiles covers the jagged data when zooming in. 3) Find a flag or something else that tells the PC program that it should stop rendering the overview DEM at some level. Is there any match? Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Samstag, 13. Januar 2018 15:10:46 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] what do the 0x4a polygon in the mean? Hi Gerd, now I get the problem. What you see is DEM from overview map. I don't think you can remove that. I have looked at available Garmin maps to compare, and there are 3 solution: - Leave jagged DEM, overview map covers a bit more area, so jagged border is like 700m from tile background. - Create complete DEM outside map area. - Add empty DEM to overview map, so it disappears when zooming out. -- Best regards, Andrzej _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev