[mkgmap-dev] DEM/Contourlines causing grey (empty) squares at the border of maps

Mon Apr 30 14:22:48 BST 2018

I'm not fully sure it's because of the poly file - but it's clearly not
based on wrong/broken input data. I created the Alps and Switzerland
equally, and all of Switzerland is part of the Alps map too. Alps work,
Switzerland does not. Strangely though changing the style-file a little -
it may mean a map does not have the problem - so I think it's maybe only
partly related to the poly file?

On 30 April 2018 at 15:04, Felix Hartmann <extremecarver at gmail.com> wrote:

> Hi Gerd - can you find a pattern here?
> Folllowing are the polygons of 10 broken (out of a sample of 94 rather
> "small" countries) poly files.
> https://openmtbmap.orgbroken_contours.zip
>
> it's
> Germany, Bavaria, Czech, Finland, Niedersachsen, Nord-Rhein-Westfalen,
> Poland, Paraguay, Romania
> Switzerland, Sweden
>
> The remaining 84 countries work fine in Basecamp (leaves about 60
> countries which are usually pretty big and I did not care to check as it
> means zooming in to 30km, sometimes 50km and pan around all borders of the
> map in Basecamp to spot if it's working or not).
>
> On 27 April 2018 at 09:27, Gerd Petermann <gpetermann_muenchen at hotmail.com
> > wrote:
>
>> Hi Felix,
>>
>> a convex polygons doesn't seem to solve it. I tried with the attached and
>> still see those problems :-(
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
>> Gerd Petermann <gpetermann_muenchen at hotmail.com>
>> Gesendet: Freitag, 27. April 2018 08:53:28
>> An: Development list for mkgmap
>> Betreff: Re: [mkgmap-dev] DEM/Contourlines causing grey (empty) squares
>> at the border of maps
>>
>> Hi Felix,
>>
>> I think it is the shape of the poly that matters. Triangular shapes seem
>> to be problematic. Pattern in DEM would be something like
>> UUUUUUUUUUUUU
>> UUUUUUVUUUUUU
>> UUUUUVVUUUUUU
>> UUUUVVVUUUUUU
>> UUUVVVVVUUUUU
>> with U for undefined and V for knwon height.
>>
>> If you use the (rectilinear) area.poly created by splitter when splitting
>> the geofabrik OSM files you will not see this pattern as often.
>> Maybe it would be enough to change the poly so that it is convex, not
>> concave:
>> https://en.wikipedia.org/wiki/Concave_polygon
>>
>> And yes, I can confirm the missing altitude values with gray squares.
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
>> Felix Hartmann <extremecarver at gmail.com>
>> Gesendet: Freitag, 27. April 2018 08:42:52
>> An: Development list for mkgmap
>> Betreff: Re: [mkgmap-dev] DEM/Contourlines causing grey (empty) squares
>> at the border of maps
>>
>> I guess if the poly is a bit bigger - it would not happen? Could you try
>> by enlarging the poly 2km to the outside? Not using a poly at all would be
>> really big or am I wrong? Which normal poly do you mean? The area.poly
>> created while splitting the geofabrik osm files? Or the area.poly created
>> while splitting the phyghtmap osm.pbf contourlines file?
>>
>> I also noticed that while any of that grey square is visible in Basecamp
>> - Basecamp does not show altitude in the lower left corner anymore.
>>
>> On 27 April 2018 at 07:40, Gerd Petermann <gpetermann_muenchen at hotmail.c
>> om<mailto:gpetermann_muenchen at hotmail.com>> wrote:
>> Hi Felix,
>>
>> hmm, yes, that really looks bad. At the moment I only have work-arounds:
>> 1) Add additional DEM layers so that the error only shows up in smaller
>> rectangles.
>> 2) Don't use --dem-poly, I think this causes the trouble. Or maybe try
>> the poly file created for the normal tiles.
>>
>> I guess that the encoder still doesn't work 100% correctly, but I have no
>> idea how to fix that and Frank Stinner seems to have stopped his work on
>> https://github.com/FSofTlpz/Garmin-DEM-Build
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:
>> mkgmap-dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Gerd Petermann <
>> gpetermann_muenchen at hotmail.com<mailto:gpetermann_muenchen at hotmail.com>>
>> Gesendet: Donnerstag, 26. April 2018 20:53:21
>> An: Development list for mkgmap
>> Betreff: Re: [mkgmap-dev] DEM/Contourlines causing grey (empty) squares
>> at      the border of maps
>>
>> Hi Felix,
>>
>> I'll have a closer look tomorrow. IIRC this also happens with Garmin maps.
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:
>> mkgmap-dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Felix Hartmann <
>> extremecarver at gmail.com<mailto:extremecarver at gmail.com>>
>> Gesendet: Donnerstag, 26. April 2018 20:23:11
>> An: Development list for mkgmap
>> Betreff: Re: [mkgmap-dev] DEM/Contourlines causing grey (empty) squares
>> at      the border of maps
>>
>> well maybe it's more common - like in 1/5 maps if the include 1" DEM data
>> - only happens if map includes DEM.
>>
>> On 26 April 2018 at 20:20, Felix Hartmann <extremecarver at gmail.com<mailt
>> o:extremecarver at gmail.com><mailto:extremecarver at gmail.com<mailto:
>> extremecarver at gmail.com>>> wrote:
>> In some cases at the borders of maps - there appear grey rectangles in
>> Basecamp and Mapsource (well do not mind Mapsource much - it's very
>> outdated) - this only appears if using a DEM/contourline overview...
>>
>> Sorry as Basecamp is windows only - only windows installer/Mac OSX gmap
>> file here:
>> https://openmtbmap.org/mtbbayern.exe
>> or
>> https://openmtbmap.org/mtbbayern_macosx.7z
>>
>> Without contourlines the map works fine (mapsetx.tdb...)
>> Contourlines map alone also does not work (mapsetz.tdb...)
>>
>>
>> So the bug is clearly in the transparent DEM/contourlines map. Sometimes
>> simply rendering the contourlines map again and the bug is gone...
>>
>>
>> Seems to be not that common but also not that rare (maybe in 1 out of 20
>> maps)
>>
>> --
>> Felix Hartman - Openmtbmap.org & VeloMap.org
>> Schusterbergweg 32/8
>> 6020 Innsbruck
>> Austria - Österreich
>>
>>
>>
>> --
>> Felix Hartman - Openmtbmap.org & VeloMap.org
>> Schusterbergweg 32/8
>> 6020 Innsbruck
>> Austria - Österreich
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk<mailto:mkgmap-dev at lists.mkgmap.org.uk>
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>> _______________________________________________
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>>
>>
>>
>> --
>> Felix Hartman - Openmtbmap.org & VeloMap.org
>> Schusterbergweg 32/8
>> 6020 Innsbruck
>> Austria - Österreich
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
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>>
>
>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
> Schusterbergweg 32/8
> 6020 Innsbruck
> Austria - Österreich
>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Schusterbergweg 32/8
6020 Innsbruck
Austria - Österreich
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