[mkgmap-dev] Anti-island check confused; defined a monster multipolygon

Sat Feb 6 16:02:21 GMT 2010

Hello Mark,

> > It seems that the anti-island check got the piecewise defined coast line
> > of Inarinjärvi (Lake Inari) wrong.  I now defined a multipolygon for the
> > lake and its about 700 islands, hopefully making no mistake in the process:
> > http://www.openstreetmap.org/browse/relation/402543
> 
> When you say "wrong", what exactly do you mean?

I mean these messages from --generate-sea=multipolygon,no-sea-sectors:

2010/02/06 12:16:26 WARNING (Osm5XmlHandler): 63240003.osm.gz: Converting anti-island starting at http://www.openstreetmap.org/?mlat=68.79379&mlon=27.95413&zoom=17 into an island as it is surrounded by water
2010/02/06 12:16:26 WARNING (Osm5XmlHandler): 63240003.osm.gz: Converting anti-island starting at http://www.openstreetmap.org/?mlat=69.41525&mlon=28.71751&zoom=17 into an island as it is surrounded by water
2010/02/06 12:16:26 WARNING (Osm5XmlHandler): 63240003.osm.gz: Converting anti-island starting at http://www.openstreetmap.org/?mlat=66.56882&mlon=27.78983&zoom=17 into an island as it is surrounded by water

Today, I started from the first one and defined the Inarinjärvi multipolygon.
A couple of days ago, I checked all anti-island warnings and fixed the
genuine ones.  These three cases look like a lake mistaken for an anti-island.

I do not blame mkgmap; I think that the right thing is to define
multipolygons for all lakes.

	Marko