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[mkgmap-dev] Broken coastline errors between V1188 and V1398

From Michael.TheBlackCat michael.theblackcat at googlemail.com on Wed Nov 25 09:05:48 GMT 2009

Hi Chris,

thanks for your well done work. I tested your script with mkgmap V 1398 
and the daily download from


After building, i see the complete coastline as before in version 1188 
of mkgmap. Now i don't know what to do in the next step. A nice variant 
would be a code extension for mkgmap with such behavior.  Who of the 
mean mkgmap developers is able to support such code extension? Or is it 
a minor functionality/behavior which should never be implemented?



Chris-Hein Lunkhusen schrieb:
>>> I can confirm that this problem exists in the newer versions of mkgmap.
>>> Some coastlines are missing in the map.
>> After playing a little bit with the data, I think it is the
>> MP code thats causing the coastline to disappear.
>> It seems that the error occurs, when a coastline is member
>> of to many boundary-multipolygons. In my test the coastline
>> was disappearing when beeing member of more than two
>> boundary-MPs.
>> So as a workaround: I think for boundary-multipolygons the
>> multi-MP handling is not neccecary at all, because
>> boundaries (normally) are rendered as lines and not as
>> areas.
> I hacked a little OSM preprocessor in vb.net (don't speak java)
> which does the following:
> change type from multipolygon to boundarypolygon for all
> MPs with no inner-elements. This eliminates the MP
> processing for those boundary polygons.
> If someone want's to get it, -> mail me.
> Chris
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