[mkgmap-dev] [PATCH v2] sea polygons

Sun Aug 2 16:37:39 BST 2009

Christian,

thanks, this make perfect sense now. eager to test when you get the  
support for non-closed coastlines.

apo

On Aug 2, 2009, at 8:32 AM, Christian Gawron wrote:

> Dear Apollinaris,
>
> this is a misunderstanding.
>
> I use the relation internally:
> The code right now creates a relation with the sea as "outer" and the
> (closed) coastline segments as "inner" members. This way I don't  
> have to
> think about how to "punch the holes" into the sea.
> What is still missing is the handling of non-closed coastline  
> segments -
> these have to be added to the "outer" polygon.
>
> There is no need for a relation in the raw data.
>
> Best wishes
> Christian
>
> Apollinaris Schoell schrieb:
>> this is really great to get sea polygons. makes maps really much  
>> better
>> Don't understand why is there a need for relations?
>> is it common to have relations for coastline? have never seen it. my
>> understanding is the right side of the way is sea, left side is land.
>> how can the knowledge of inner way help here except in the case of an
>> island where you have the whole closed polygon available to make a
>> decision.
>> it's nearly impossible to build a relation for a whole continent. due
>> to restriction in relation members you would need parent relations
>> collecting all pieces. and when done all coastlines will be inner
>> elements. there can't be an outer element except you extend the
>> definition to leave earth
>>
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>
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