I solved it. As per Rossko suggestiong of creating holes in the
polygon while generating KML files. This answer is for anyone who is
still searching:
Check if polygons are overlapping if so get the overlapping polygons
geography or polygon data and while generating KML add them under
<innerBoundaryIs> of the container one. say for e.g Zipcode A overlaps
zipcode B then you can add zipcode B's geographic data into
<innerBoundaryIs> of Zipcode A.
To find out if two polygons intersect what I did was, I get the list
of zipcodes and its corresponding geography instance, loop through
each one and check if it overlaps:
say sourceZipcode = collection[0].zipcode, souceGeography=
collection[0].geography
for(int i=0;i<collection.count;i++)
{
if (!collection[j].Zipcode.Equals(sourceZipcode ) &&
collection[j].Geography.STDifference(souceGeography).STNumPoints() ==
0)
{
GeoData newData = new GeoData{ Zipcode = zipcode,
OverlappingZipcode = geoCollection[j].Zipcode, OverlappingGeography =
geoCollection[j].Geography };
//check if entry exists
if (!_overlappingPolygons.Exists(s => s.OverlappingZipcode ==
newData.OverlappingZipcode &&
s.OverlappingGeography.STEquals(newData.OverlappingGeography).IsTrue))
{
//there is a overlapping polygon add it to list.
_overlappingPolygons.Add(newData);
}
}
}
this way I have the overlappingpolygons for the zipcode under check
and add them to innerboundaryIs tag.
On May 27, 10:18 am, GAPINewbie <[email protected]> wrote:
> Yes I did see that in Google earth using Altitude we can make some
> differentiation.
>
> Am not sure I understand your suggestion about creating polygon's with
> holes. My understanding is that the geographic data(from the source
> census.gov) would take care of holes if any. But am guessing may be
> the data is messed up? Sorry am pretty new to this KML/Geo spatial
> stuffs. Can you give me some e.g. how to go about creating holes in
> the polygons while generating my KML.
>
> On May 17, 6:16 pm, Rossko <[email protected]> wrote:
>
>
>
>
>
>
>
> > > I was wondering if its possible to identify which polygon was clicked
> > > on the overlapping polygons.
>
> > If we can't tell which one the user intended to click, I'm not sure
> > how the code could. In Google Earth you could give them some
> > altitude, but maps are flat so that won't work here.
>
> > > In my application I generate KML file ...
>
> > Generate unambiguous KML ; you can create polygons with holes in,
> > where your 'overlapping' poly can fit. This should deal with 'island'
> > zipcodes inside other zipcodes.
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