Hi Andrzej, at resolution 24 we only do simplification which doesn't have visual effects. Your patch might help. I tried that once and found the improvement too small compared to the increased run time. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Sonntag, 25. April 2021 17:47 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] mkgmap-dev Digest, Vol 153, Issue 40 Resolution 23 raster problems Hi, maybe 10m contours are too dense for this area? Please try attached patch. I have moved D-P simplification before rounding of coordination. This should preserve shape of the line a bit better. I'm not sure if this is a safe modification, but it seems to works. I haven't found, where is done simplification of lines at resolution 24. Angle fixer probably works on roads only or I don't understand this code correctly. -- Best regards, Andrzej