[mkgmap-dev] DEM-file generation from geo-tiff sources ?

Tue Jan 2 14:58:10 GMT 2018

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
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