[Tagging] Lakes, islands and multipolygons
sly (sylvain letuffe)
liste at letuffe.org
Fri Oct 16 11:45:50 BST 2009
On vendredi 16 octobre 2009, Jukka Rahkonen wrote:
> Currently big lakes in Finland have been tagged as coastlines which is a
> good workaround and looks correct in slippy maps. However, it is not
> right, because they are not seas but just lakes.
I would myself prefer to use something else to make it easier to tell appart
what about something like natural=lakebank or lakeline or waterline to define
(Then put all that in a multipolygon relation natural=water)
> By the way, why do we call all polygons having holes as multipolygons,
> even if they have only one outer ring? But of course they can be
> considered as simple multipolygons.
The "multipolygon" name of osm was probably not perfectly choosen ;-)
It's a "describe them all" from 1 to n polygons. It's not multipolygon in the
GIS sense but hey, does that matter ?
Sylvain Letuffe liste at letuffe.org
qui suis-je : http://slyserv.dyndns.org
More information about the Tagging