[OSM-newbies] What's the easiest method to "snap" an area boundary to adjacent ways?
ezekielf at gmail.com
Sat Aug 28 04:55:44 BST 2010
None of the OSM editors have a feature like this that I know of. The
preferred data structure for representing a shared boundary such as a
lakeshore and a park, or two neighboring counties is to use several a
Multipolygon Relations. Have a look on the multipolygon wiki page for
information on how to do this.
http://wiki.openstreetmap.org/wiki/Multipolygon . It can get pretty
complicated but will start to make a lot of sense once you think it through.
By using multipolyons for areas with shared borders, snapping to an
existing way becomes a non-issue because only one way is ever needed to
represent a shared border.
As Samat mentioned, although there is not strict agreement about this in the
project, many consider it incorrect for the borders of an area to share
nodes or ways with the streets that border it.
On Fri, Aug 27, 2010 at 7:20 PM, Russell Harrison <
russell.harrison at gmail.com> wrote:
> I would love to know an easier way to do this as well. I spent a long
> time merging every set of nodes for a park that borders a lake to get
> the shoreline matched up. It also seems important for administrative
> boundaries that border stream or river center lines as an example.
> On Fri, Aug 27, 2010 at 4:22 PM, m902 <m902.osm at gmail.com> wrote:
> > I have a few situations where the boundary (or part of it) of an area is
> > adjacent way. Examples are:
> > - A sports field, bounded by a river on one side and a road on another.
> > - A residential area bounded by a road on one side and the sports field
> > another.
> > - A commercial area bounded by a road.
> > Obviously I could draw the boundary by selecting each node of the
> > way...but I wondered if I am missing somethng and if there is an easier
> > method?
> > I would like to just select a beginning node and an end node on the
> > way and tell it to set the area boundary to follow it.
> > Is anything like that possible?
> > Couldn't see anything like that in Potlatch or JOSM.
> > Thanks...
> > Martin
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