Hi Mike, I have never used any GIS system. I just download zipped hgt files from e.g. http://viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm unzip them into one dir called srtm3 and feed that to mkgmap. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von EthnicFood IsGreat <ethnicfoodisgreat@gmail.com> Gesendet: Dienstag, 23. Januar 2018 15:48:54 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: [mkgmap-dev] Open source GIS systems and DEM Hello. For those of you that use an open source GIS system, I would like to ask you why you chose the one you use. When developing the DEM functionality for mkgmap, is a certain system preferred? I have GRASS installed, but I keep hearing about QGIS. Mark Bradley _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev