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[mkgmap-dev] "Small" SRTM1 files and DEM maps

From Gerd Petermann gpetermann_muenchen at hotmail.com on Mon Apr 13 07:24:12 BST 2020

Hi Carlos,

sorry for the late response. I found no hint on the phyghtmap page http://katze.tfiu.de/projects/phyghtmap/
regarding a new format for srtm data. The hgt format is not compressed. Do you know from where these 12.4 MB files came from?


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <cdavilam at orangecorreo.es>
Gesendet: Samstag, 11. April 2020 17:09
An: Development list for mkgmap
Betreff: [mkgmap-dev] "Small" SRTM1 files and DEM maps

I use phyghtmap to build contour lines and also to download hgt data
that I then use to build DEM maps with mkgmap. For a long time, SRTM1
files (and also VFP1) have all been ~24.7 MB in size, but lately (I
don't remember since when) SRTM1 are also served as 12.4 MB files.
phyghtmap is able to generate contour lines from those small files, as
they seem to contain the same information but with a different
compression ratio, but mkgmap fails to read them, and report them as
missing. Would it be possible to get support for such files in mkgmap?
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