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[mkgmap-dev] mkgmap skips multipolygon with no nodes in map area

From Ranko Jaksic rjaksic at zgi.hr on Sat Sep 12 19:54:49 BST 2020

Hi Gerd,

Great! Thanks for the fast fix!
No missing multipolygon with release 4574.

I was afraid you would say that this is such a rare situation that the check was "intentionally left out because of performance issues"  :)


On 12.09.2020. 8:09, Gerd Petermann wrote:
> Hi Ranko,
> thanks for reporting. Strange that such an obvious error did not show up before!
> Problem is in the method MultiPolygonRelation.removeWaysOutsideBbox(). I am working on a fix.
> Gerd
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Ranko Jaksic <rjaksic at zgi.hr>
> Gesendet: Donnerstag, 10. September 2020 15:19
> An: mkgmap-dev
> Betreff: [mkgmap-dev] mkgmap skips multipolygon with no nodes in map area
> Hi Gerd,
> Recently I discovered a missing forest "triangle" on my map (see attached screenshots).
> I am using the same mkgmap/splitter (4551/597) versions as before, but obviously OSM data changed so splitter generated a slightly different areas.list
> The forest in question consists of two very large multipolygons:
> https://www.openstreetmap.org/relation/1431438
> https://www.openstreetmap.org/relation/4433469
> Both relations cover the map-tile area, but mkgmap creates no polygon for the second one.
> It supose it doesn't get detected in mkgmap because it has no nodes in the area
> (splitter has no such problem: it detects the multipolygon and includes it in the output file).
> I am including my test data:
> - forest.osm.pbf  - contains only these two relations (or use croatia-latest.osm.pbf extract from Geofabrik :)
> - areas-test.list - area in question
> - forest-typ.txt  - simple typ file to display forest (not really needed)
> test code:
> java -jar splitter.jar --split-file=areas-test.list forest.osm.pbf
> java -jar mkgmap.jar -c template.args forest-typ.txt --gmapi --remove-ovm-work-files
> Splitter includes both relations in the 88010024.osm.pbf, but mkgmap includes only the first one in the generated 88010024.img file.
> regards,
> Ranko
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> mkgmap-dev at lists.mkgmap.org.uk
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