[mkgmap-dev] Flooding of sea - this time inside the middle of the Alps, not related to geofabrik cutting

Fri Feb 26 10:52:28 GMT 2010


On 26.02.2010 11:49, Mark Burton wrote:
> Felix,
>
>    
>> I looked for an anti-lake, but could not find one...
>> I think ultimately we would need some check against flooding. Easiest
>> maybe would be if there are more than 30 forest polygons inside water
>> (without natural=land) and if so, then assume tile is flooded and put
>> land into the whole tile. Much better to miss some sea, then to have
>> flooding.
>>      
> Agreed, sanity checking the sea areas (do they contain roads/cities)
> would make sense because at the moment it only needs a tile to contain
> a single way tagged natural=coastline and it is likely to get flooded.
>
> Mark
>    
Couldn't there be some sanity checking using the multipolygon code? 
Maybe remove sea polygon once more than 1000 polygons want to cut inside 
the sea, and no more than 5% are natural=land (so that regions with many 
islands are still having sea, though I doubt that any single tile can 
contain more than 500 islands). It should be possible somehow to check 
for something that is so easily detectable by human mind...
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