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

Sat Jan 13 16:52:09 GMT 2018

I think I found the bug.
The tile contains negative heights (~170m) and this causes trouble in the calculation of the needed bytes to store the height.
See http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4051

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
Gesendet: Samstag, 13. Januar 2018 16:57:04
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi Frank,

I've compared results from mkgmap with those from BuildDEMFile. Both produce different errors, so that should help.
See
http://files.mkgmap.org.uk/download/391/baddem3.zip
The script produces a gmap folder with two different DEM files, 63240001_2.DEM is from BuildDEMFile and seems to do more harm ;-)

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
Gesendet: Samstag, 13. Januar 2018 16:33:31
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi Minko,

I can reproduce the wrong data with your file with just
--dem-dists=26512

@Frank: I've written the attached data with the attached patch. Hope you can extract the values you need.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von lig fietser <ligfietser at hotmail.com>
Gesendet: Samstag, 13. Januar 2018 15:35:17
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi,
Unfortunately older mkgmap versions showed the same behaviour, only smaller grey tiles. I've  noticed that my other Germany Benelux map from last week had similar issue, only those greay tiles were not so big as in the video. Now I have tested 4048 again but with slithly modified dem distances. That grey area seems gone, but I got something weird in return 😉 see attachment. It seems all happening in the same area, around Tournai. I've uploaded this tile here http://mijndev.openstreetmap.nl/~ligfietser/mkgmap/

My values are now:
dem-dists: 3312,3312,9936,13248,26512
overview-dem-dist=88368

________________________________
Van: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> namens Frank Stinner <Frank.Stinner at kabelmail.de>
Verzonden: zaterdag 13 januari 2018 05:09:35
Aan: mkgmap-dev at lists.mkgmap.org.uk
Onderwerp: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading

Hi Gerd,

yes, at first we have to identify the maptile. Perhaps can Minko help. Thats a "trial and error" play. Perhaps with comment out in areas.list?

You ask for the input format? It's an ordinary textfile. One text-line for one data-line. The values in a line are separated by space, comma,
semicolon or tab. If this file have q.e. 200 x 150 values, create BuildDEMFile 3 x 4 DEM-Tiles.

As next i extract with the simple perl-script extracttiles.pl a range of tiles, encode this whith

BuildDEMFile --dem="%TESTMAPDIR%\Product1\99950001\99950001.DEM" -O --data=dem.data --lastcolstd=false --left=0 --top=0.999991893768310546875
--dlon=0.0003 --dlat=0.0003

and see on the testmap 99950001.osm, what's going on. It's only "trial and error".

Frank

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