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

Mon Apr 30 14:04:13 BST 2018

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.com
> <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<mailto:
> 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
> _______________________________________________
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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
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