[josm-dev] Clockwise coastline, anti-clockwise water

[Dirk Stöcker]

On Mon, 7 Jul 2008, Matthias Julius wrote:

>> I thought the same. But the check anyway only tests closed ways (there is
>> no real useable way to determine this issue for non-closed ways. Think of
>> e.g. a U or J shaped way. How will you determine on which side water is
>> (You can probably detect minimum distances to 100% land related
>> structures and assume the side with these structures is land, but this
>> will be a big effort).
>
> Neighboring coastlines need to go in opposite direction.  It is an
> error if they don't.
>
> Didn't somebody implement a test for that?

How do you want to do that automatically? It's easy for a human to see 
that, but very complicated to convert this into an working algorithm.

>> To make it a bit more useful, I will an an check, which tests for unclosed
>> ways in case of "natural=". That will be helpful.
>
> At least coastlines don't need to be closed.  And it would be good if
> we could drop that requirement for other areas as well.

It's no "requirement", but an validation warning. And like all the others, 
it will be able to turn it off :-)

Ciao
-- 
http://www.dstoecker.eu/ (PGP key available)