Hi Carlos, so your conversion routine is wrong. The file size is 12.970.802 bytes. There is no integer n for which 2 * n^2 results in this value.
Gerd ________________________________________ Von: mkgmap-dev <[email protected]> im Auftrag von Carlos Dávila <[email protected]> Gesendet: Donnerstag, 16. April 2020 11:19 An: [email protected] Betreff: Re: [mkgmap-dev] "Small" SRTM1 files and DEM maps Hi Gerd Forgot to mention files are downloaded as geotiff, but I then convert them to hgt, sorry. You can download a sample one from https://alternativaslibres.org/tmp/N50E118.hgt El 16/4/20 a las 9:18, Gerd Petermann escribió: > Hi Carlos, > > are you talking about geotiff format? I think someone documented how that > format can be converted to *.hgt. > Can you post a link to such a file? > > Gerd > > > > ________________________________________ > Von: mkgmap-dev <[email protected]> im Auftrag von > Carlos Dávila <[email protected]> > Gesendet: Montag, 13. April 2020 14:08 > An: [email protected] > Betreff: Re: [mkgmap-dev] "Small" SRTM1 files and DEM maps > > Hi Gerd > They are downloaded by phyghtmap. This is what I found digging into > phyghtmap files: > |def getSRTMFileServer(self, resolution, srtmVersion):|| > || if srtmVersion == 2.1:|| > || return > "https://dds.cr.usgs.gov/srtm/version2_1/SRTM{0:d}".format(resolution)|| > || elif srtmVersion == 3.0:|| > || if resolution == 1:|| > || urlRe = > "https://earthexplorer.usgs.gov/download/8360/SRTM1{:s}V3/GEOTIFF/EE";|| > || elif resolution == 3:|| > || urlRe = > "https://earthexplorer.usgs.gov/download/4960/SRTM3{:s}V2/GEOTIFF3/EE";|| > || return urlRe| > They should come from the second URL above. > > El 13/4/20 a las 8:24, Gerd Petermann escribió: >> 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? >> >> Gerd >> >> ________________________________________ >> Von: mkgmap-dev <[email protected]> im Auftrag von >> Carlos Dávila <[email protected]> >> 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? >> _______________________________________________ >> mkgmap-dev mailing list >> [email protected] >> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev >> _______________________________________________ _______________________________________________ mkgmap-dev mailing list [email protected] http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list [email protected] http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
