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

Thu Apr 16 14:21:00 BST 2020

That seems to be bash on linux. Perhaps, this will help. The double 
quotes are to handle file names with spaces and the like in them.

$ for tiffile in *.til; do echo gdal_translate -of SRTMHGT "$tiffile" 
`basename "$tiffile" .til`.hgt; done
gdal_translate -of SRTMHGT xyz.til xyz.hgt
$ ls
xyz.til

Randolph J. Herber

On 4/16/2020 3:54 AM, Steph wrote:
> Hi,
>
> Uggly scripts I use…
>
> - tif2hgt.sh:
> for tiffile in *.tif;do
>  gdal_translate -of SRTMHGT $tiffile $tiffile.hgt;
> done
>
> - tif_dim.sh (if .tif downloaded by phyghtmap are "too" small…)
>  for tiffile in *.tif;do
>      gdalwarp -of GTiff -srcnodata 32767 -rcs -order 3 -ts 1201 1201 
> -multi $tiffile $tiffile.TIF;
>  done
>
> Renaming is not integrated within the scripts… 🙁 (removing first 
> extension)
> Perhaps the second can help… 🙄
>
> On Linux !
>
> @+
> Steph
>
> Le 16/04/2020 à 10:18, Gerd Petermann a écrit :
>> 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 <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag 
>> von Carlos Dávila <cdavilam at orangecorreo.es>
>> Gesendet: Montag, 13. April 2020 14:08
>> An: mkgmap-dev at lists.mkgmap.org.uk
>> 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 <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?
>>> _______________________________________________
>>> mkgmap-dev mailing list
>>> mkgmap-dev at lists.mkgmap.org.uk
>>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>> _______________________________________________
>>> mkgmap-dev mailing list
>>> mkgmap-dev at lists.mkgmap.org.uk
>>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
>> _______________________________________________
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>>
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