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[mkgmap-dev] Holes in the Sea

From Marko Mäkelä marko.makela at iki.fi on Tue Feb 28 16:35:34 GMT 2012

On Tue, Feb 28, 2012 at 02:19:28PM +0100, RheinSkipper wrote:
>To make sure, coastline is OK, I extracted one from the planet and used 
>this as coastline-file this time.

How can you be sure that the planet coastline was fully OK on that day?  
Does anyone have validator statistics on good/bad coastline? The Finland 
coastline is broken about once in every couple of weeks or months. I 
would guess that the planet coastline must be broken every week or more 
often, unless people are watching for and fixing bugs every day (like I 
am in Finland).

Would it be reasonable to extract the natural=coastline ways from the 
planet.osm and load it in JOSM to check it? Or translate only the 
coastline in mkgmap, to get all coastline checks? Would it be possible?

For data validation, you might also try OsmAndMapCreator; it has a bit 
different checks.

I have never used a separate coastline-file in mkgmap, so I do not know 
if it would solve the problem of a sea tile that lacks any 
natural=coastline polygon.

Best regards,


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