That seems odd, alright.
Can you provide some actual data that demonstrates the problem?
Otherwise it's hard to say what's going on, and impossible to provide a fix.
On 8/8/2013 2:14 AM, Richmond, Tanya wrote:
Hi,
Would you be able to help me with a problem I have with unioning
polygons? I am trying to union polygons that contain holes and I know
this should work, as I have read previous entries on the forum, but no
matter what I try, it does not work for me.
When I am unioning polygons, this may result in one, two or more
polygons, some of which may contain holes.
Here is a picture of what I am trying to union:
I am trying to merge the brown areas into single polygons, so, you can
see that should result in two polygons, one of which contains a hole.
What I get is this:
The grey areas are the new polygons, but you can see that it has
inserted extra holes and created a link between the polygons, where
there shouldn't be one.
I have tried three different approaches -- firstly, I iterated
repeatedly through all the polygons, unioning them where there was an
intersect. Secondly, I tried adding them to a collection, setting the
buffer to zero and doing a collective union. Third, I tried using the
CascadedPolygonUnion command and the above picture is the result of
that. The other two approaches gave slightly different results, but
none of them worked correctly.
Are you able to offer any alternative suggestions?
Many thanks
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