[OSM-dev] osm2pgsql Lua tag transformations

[nebulon42]

Thank you for explaining this. Would you see the possibility of removing 
relation members from the geometry as something that could be added as 
feature? Or would it be difficult/not worth/...? Otherwise I could 
follow up on this on the osm2pgsql issue tracker.

For completeness reasons: Does anybody know of another or possible way 
of solving this problem of platforms being part of the route (like here: 
https://www.openstreetmap.org/#map=18/48.19117/16.34794&layers=T)?

Thanks, nebulon42

Am 2015-06-24 um 21:37 schrieb Sarah Hoffmann:
> Hi,
>
> On Sat, Jun 20, 2015 at 05:47:43PM +0200, nebulon42 wrote:
>> I'm currently experimenting with Lua tag transformations when
>> importing data with osm2pgsql and trying to remove members of
>> type=route relations (public transport routes) that have the role
>> platform from planet_osm_line. The problem I'm trying to avoid can
>> be seen here:
>> https://www.openstreetmap.org/#map=18/48.19117/16.34794&layers=T
>> (platforms coloured like routes)
>>
>> I thought that when I set membersuperseded = 1 for the corresponding
>> relation members in filter_tags_relation_member this would work, but
>> apparently it isn't.
>
> membersuperseded doesn't really do what you think it does. If a way
> in a relation is marked as superseded, then the way itself will no
> longer be considered an object of its own but just a part of the
> relation. Or to put it the other way around, if membersuperseded is 0
> then the way may still be included in the output tables as a
> separate object (naturally depending on if it has interesting
> tags or not).
>
> It is currently not possible to exclude specific members in a
> relation from taking part in the computation of the final geometry.
> The geometry computation always uses all ways available.
>
> Sarah
>