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

Sun Jan 7 09:35:50 GMT 2018

Hi Franco,

i have seen an silly error in my area. Europa is a little bit greater ;)
Just i have "$lattop = 70". The split create 3608 tif's with 4,5 GB in 85 min. gdal4hgt create 1171 zipped hgt's with 5,8 GB in 3 h :((
And then i rebuild the tif's from the hgt's in 20 min. That are 4 GB.

Perhaps you have an to old gdal-version without lzw-compression? Or perhaps

-co \"COMPRESS=LZW\" -co \"TILED=YES\" -co \"PREDICTOR=2\"

should be better

-co COMPRESS=LZW -co TILED=YES -co PREDICTOR=2

I have found hgt's with a few deep "holes" (< 0 m) but they seems to be ok (surface mining).

Frank

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