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[mkgmap-dev] mkgmap r4022 ready

From Gerd Petermann gpetermann_muenchen at hotmail.com on Thu Dec 28 10:47:15 GMT 2017

Hi Henning,

I don't understand what you mean with "create sea polygons". It would be rather easy to fill the map overview map with them,
but I think it would look strange for a map of Switzerland.

reg. compressed files: Yes, mkgmap can read e.g. osm.zip or osm.bz2, but for hgt it does not (yet) work.
I've used code for the hgt reader which depends on random access files (MappedByteBuffer).
I'll see if performance is very different when using compressed files.


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Henning Scholland <osm at hscholland.de>
Gesendet: Donnerstag, 28. Dezember 2017 11:21:45
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] mkgmap r4022 ready

Hi Gerd,

another solution from 'nice looking' point of view except not creating
DEM would be to also create sea polygons for the whole rectangle. But I
guess it's pretty hard as it needs data tiles, am I right? For users of
course it would be better to define an poly-file, where DEM should be
created, as these poly-files already exists.

Btw.: http://www.hscholland.de/OSM/HGT.7z you can find the 'broken'
hgt-files where I got the problem Gerd pointed out. Viewfinder-data are
fine so far.

Can mkgmap read already compressed hgt-files? I remember previously
mkgmap was able to read bzip2 or gz-compressed osm-files. So there are
maybe already classes for reading compressed data in mkgmap.

Finally I want to thanks all of you for the great work! I even don't
know how long I was waiting for this feature!!!


On 28.12.2017 11:01, Gerd Petermann wrote:
> Hi all,
> see the log message http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4022
> for details about the changes.
> I've also experimented with code to read a *.poly file and use that to define an area for which mkgmap should
> not calculate DEM data but was not happy with the results so far. Maybe I'll try again.
> Henning has pointed me to an error:
> It seems that mkgmap (and probably also BuildDEMFile) somtimes create invalid DEM data
> for areas where the hgt files contain large holes, esp. when resolution is low (high dem-dist value).
> See e.g. http://files.mkgmap.org.uk/download/377/holes.jpg
> I try to find out more now.
> Gerd
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

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