[mkgmap-dev] DEM-file generation from geo-tiff sources ?From Henning Scholland osm at hscholland.de on Fri Jan 5 10:37:18 GMT 2018
Hi Frank, just my opinion: I would keep this separated from mkgmap. I mean, you need once convert the data and that's it and the tools all exist. So I think it's more useful to create a documentation about how to convert the copernicus-files into hgt. Btw. Are these files so much better compared to the viewfinder-hgt files? Henning On 02.01.2018 22:58, Frank Stinner wrote: > For my opinion your data sources are very interesting. This is a short > look to the alps, the tile E40N20 from https://land.copernicus.eu/. > > There seem's to be a little problem at the near of some coastlines, > but we have on the other hand a high resolution of 25m. I belive, a > bigger problem is the coordinate reference system. Copernicus data > have EPSG:3035, garmin use EPSG:4326. > > It would be fine, if mkgmap could be read geotiffs and calculate with > different coordinate reference systems. This would perhaps collect the > interpolation for changing the coordinate reference system and for the > garmin map. On the other hand: this is a lot of mathematical stuff. > I'm not a java hacker and i don't know, if there are usable geografic > librarys for this work. > > At the moment we have to translate the tiffs from EPSG:3035 to > EPSG:4326, then the segmentation in 1°x1° tiffs an at last the > conversion to hgt files. This should not be a very great problem with > gdal-tools or so, but it is additional work. > > > Frank > > > _______________________________________________ > mkgmap-dev mailing list > mkgmap-dev at lists.mkgmap.org.uk > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20180105/e3668cf7/attachment.html>
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