19 Jan
2013
19 Jan
'13
9:52 a.m.
On Sat, Jan 19, 2013 at 01:00:08AM -0800, GerdP wrote:
I don't know yet how multiple nested polygons look like, but I think it is a promising approach.
It should be simple. A line is both an inner member of the outer multipolygon, and the outer member of an inner multipolygon. So, basically you have two non-intersecting and non-overlapping multipolygons. There are some lakes with islands with lakes in Finland. One is Partalansaari, if I remember correctly. You could also have small patches of forest in the middle of a field in the middle of a forest, or vice versa. Marko