[mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Mon Jan 22 15:30:07 GMT 2018

Hi all,

I find similar problems when I create DEM with BuildDEMFile. I've created a package with latest mkgmap and BuildDEMFile.
DEM are very different because mkgmap assumes height 0 for missing hgt files while BuildDEMFile writes invalid height.
Both show similar problems, but not exactly the same.
In Mapsource one has to select detail level medium, zoom out with Strg + "-", goto  S7.93698 W14.30256 with
Strg+T , then zoom in several times until scale shows 500m. Parts of the hill shading disappears. The exact position may change
when you clear cache with 2x Strg+G .
This is the result produced with r4073. If you stop MapSource, rename map\OSM map.gmap\Product1\63240001\63240001_2.DEM"
to replace map\OSM map.gmap\Product1\63240001\63240001.DEM and start MapSource again and clear the cache, zoom out again, go to the same position you'll find empty part on the left at zoom level 300m. This is the DEM created by BuildDEMFile.

@Frank: This looks like an error in the DEM data to me.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
Gesendet: Montag, 22. Januar 2018 15:25:55
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi Andrzej,

found problems now when I zoom into area around S7.93698 W14.30256

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
Gesendet: Montag, 22. Januar 2018 15:21:29
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi Andrzej,

could not reproduce that yet. Please post tile boundaries and dem options in use.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej at poczta.onet.pl>
Gesendet: Samstag, 20. Januar 2018 02:15:58
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi,

I still observe the first problem with small rectangles without shading.
But I see it only when displaying small islands on a see. Like for
example Príncipe Island or Ascension Island.

Could it be, that processing sea level or voids around island could
cause similar effects like polygon border?

All my maps are currently compiled with patched mkgmap, I can't tell if
original mkgmap shows this effect too.

--
Best regards,
Andrzej
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