[osmosis-dev] question about --merge

[Christoph Wagner]

Am 18.05.2010 15:18, schrieb Brett Henderson:

> To summarise, if you can draw a graph of the data flows in Osmosis, ensure
> that you never have data being split then recombined at a later point.
> 
> In your case the only option is to split it into two steps using temporary
> XML files as you already appear to be doing.
> 
> It would be nice if Osmosis could detect this situation and throw an error,
> but it would take a lot of effort and add a lot of complexity that I don't
> really wish to attempt.



Ok, thanks for your reply. I think now I understand the situation better.

While reading your answer I got an idea to solve the problem without writing to disk.

I use a very big buffer now:

osmosis-0.35.1/bin/osmosis --rx input.osm --t outPipe.1=points \
--wk keyList="addr:interpolation,addr:housenumber" --un --s --b 100000000 \
--nk inPipe.0=points keyList="addr:housenumber" --s --b 100000000 \
--m --wx addr.osm

This works very well if you have enough RAM and set the bufferCapacity high enough.


Another possibility would be a better tagfilter that allows me to filter POIs and ways at once.
The task would be for example: "Give me all ways that match this way-filter and all nodes that match this node-filter or are part of the way that matches the way-filter"

I don't know if this is difficult to implement but I think this would be usefull.

Thanks
Christoph

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