[OSM-dev] Extracting just national boundaries

Igor Podolskiy igor.podolskiy at vwi-stuttgart.de
Sat Aug 6 16:44:54 BST 2011


Hi,

On 06.08.2011 17:38, Peter Körner wrote:
> Am 05.08.2011 17:24, schrieb Igor Podolskiy:
>> Basically, to implement a
>> --used-relations you need to compute the transitive closure of a
>> possibly cyclic graph with relations as nodes and memberships as edges,
>> and this is not trivial if all you have is a data stream and no loops -
>> which is the Osmosis model.
>
> Osmosis does something very similar in its --cascading-relations option,
> did you try that?
yes, I know about --cascading-relations, but it's a --bounding-box 
option, not a standalone task. On the other hand, you're right, you 
always could do something like

--bbox -90,-180,90,180 cascading-relations=yes

and have something like --used-relations - thanks for the pointer!

Igor



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