[OSM-dev] osm2pgsql, direction of a virtual way (based on a route)
frederik at remote.org
Wed Oct 26 15:52:43 BST 2011
On 10/26/11 16:27, marqqs at gmx.eu wrote:
> I'm wondering how osm2pgsql determines the direction of a route.
> Has the order of way-refs in the route relation influence on that?
osm2pgsql takes all the ways making up the route relation and throws
them into the GEOS LineMerge operation, documented here:
The result is a number of LineString geometries (at least one, at most
the number of relation members).
The direction of each resulting LineString should be the direction of
the majority of constituting ways.
> Are role tags "forward" and "backward" evaluated?
Not at all.
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