[OSM-dev] coastline error checker and crossing ways

[Teemu Koskinen]

On Thu, 13 Aug 2009 03:44:23 +0300, Cartinus <cartinus at xs4all.nl> wrote:

>> Also two quality q's:
>>
>> 1. Pyramid Rock off of the coast of SF flags an error...I'm not sure
>> what's going on here.
>>
>> Way 32289185 is a CCW square island -
>>
>> http://www.openstreetmap.org/browse/way/32289185
>>
>> It looks okay to me but renders as a triangle, not a square, on the map.
>> (Is it possible the base tiles haven't been updated in a while?)
>>
>> Way 32289186 is a closed CCW triangle, that doesn't show on the map at  
>> all.
>>
>> Does anyone know why the coastline error checker dots this or the map
>> tiles are wrong?
>
> It's probably too small. In a previous discussion about too small islands
> Martijn posed the question if we should really call that coastline and  
> not
> use another tag like natural=rocks or man_made=*
>

The small islands ARE islands, and there are lots and lots of them in here  
Finland. Finland's maritime border is based mainly on islands that are  
only few square meters, and are considered a coastline. Also the coastline  
should not be simplified in high zooms, as that will lead to visual bugs  
when there's something very near the coastline, eg. bridges, buildings and  
piers.

Teemu Koskinen