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[mkgmap-dev] splitter with --polygon-desc-file crashes

From Gerd Petermann gpetermann_muenchen at hotmail.com on Wed Feb 16 17:35:51 GMT 2022

Hi Karl,

I've not tried it yet. What is the error message from splitter?
When experimenting with small files it sometimes makes sense to increase
the resolution (14 or 15) and lower the --max-nodes values to get closer to a large scale
result (like > 100 tiles or so)


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von 7770 <7770 at foskan.eu>
Gesendet: Mittwoch, 16. Februar 2022 17:52
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] splitter with --polygon-desc-file crashes

I have asked long ago about this particular problem i have and it was long
time ago i last tried, but now i did again. It relates to splitter and usage
of --polygon-desc-file=

This is how i have tried:
1.  Download data for Estonia and Latvia.

2. convert to o5m and combine
osmconvert estonia-latest.osm.pbf -o=estonia-latest.osm.o5m;
osmconvert latvia-latest.osm.pbf -o=latvia-latest.osm.o5m;
osmconvert estonia-latest.osm.o5m latvia-latest.osm.o5m -o=ee_lv.o5m;

3. Prepare an osm-polygon file with one area for Estonia and one for Latvia.
(file attached)

4. Run splitter:
java -Xmx2000m -jar ${SPLITTER} \
--polygon-desc-file=./polygon_ee_lv.osm \
--output-dir=ee_lv/splitted/ \
--max-nodes=750000 \
--no-trim \

While running this is seems like the Latvia part is fine, but the Estonia

The error message doesn't say much (that i understand).
But maybe it makes some sense to you?
I imagine something is wrong with the polygon file, but i dont know what.

The polygon files is partially made in JOSM and partially manaully to re-use
the same segments/edges which belong to both countries. (I could see that Gerd
was using this concept in some example file for Germany and the alps, but i
could not add two ways over one edge in JOSM, so i made manual chanegs in the
I tried also making two separate boxes, one for each country, but that was
just as bad (not reusing edges).

Anything that could be suggested that i change or try?

PS. i am trying this on small scale for two smaller countries, later i will
apply it because i need to split europe in parts of max 4GB.


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