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[mkgmap-dev] maps overlaying each other

From Gerd Petermann gpetermann_muenchen at hotmail.com on Sun Dec 6 11:32:03 GMT 2020

Hi Karl,

I prefer to merge the country data first and use one splitter run to produce the tiles and one gmapsupp for all, but you can also produce mutliple gmapsupp where some tiles appear in both, just make sure that those tiles are really the same. So, computing the *.img files once and combining them in different gmapsupp should work.


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von 7770 <7770 at foskan.eu>
Gesendet: Sonntag, 6. Dezember 2020 11:42
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] maps overlaying each other

How can i avoid that a section of a map (in a gmapsuppA.img) overlays some
neighbouring map (in a different gmapsuppB.img) making it inaccessible on the
GPS unit?

say i have Sweden and Norway, neighbouring countries. Data is downloaded from
goefabrik per country. Splitting and generating map done per country.
Sweden gets --draw-priority=50 and Norway gets 51.
In the border areas, when the tiles are a bit outside of the country, the
Norwegian map overlays the Swedish, details from both maps are visible but one
cannot click on a point on the Swedish (lower) map because the empty Norwegian
map is drawn above.

--transparent option is not used to avoid other non-wanted transparency.
--bounds is used.
--add-boundary-nodes-at-admin-boundaries is used.

Is there some good way to avoid this issue, to make sure that details from the
lower map can be accessed? Perhaps make the splitter more strict on the


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