Hello,
I'm intersecting two layers of data (polygon.shp and plygon2.shp). One of them (polygon2.shp) has two completely overlapping polygons. I'm getting this:
How to get this:
Here is the sample data: .
Solved
Intersecting overlapping polygons
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Best answer by ebygomm
Do you actually want to intersect the polygons or just find the overlaps?
At the moment the polygons A,1&2 are sent into the area on area overlayer. One area is returned which is the area of polygon A which does not overlap any other polygon. The other area that is returned is the area of polygon A which overlaps both polygon 1 &2 (hence why overlaps says 3)
This is the shape returned where the poly2_ID is missing, it is the area that is not overlapped by any other polygon
If you are just looking for a report of which poly2_IDs overlap poly_ID A then I'd suggest a spatial relator set to intersect, build a list then list explode.
+32- Influencer
- Best Answer
Do you actually want to intersect the polygons or just find the overlaps?
At the moment the polygons A,1&2 are sent into the area on area overlayer. One area is returned which is the area of polygon A which does not overlap any other polygon. The other area that is returned is the area of polygon A which overlaps both polygon 1 &2 (hence why overlaps says 3)
This is the shape returned where the poly2_ID is missing, it is the area that is not overlapped by any other polygon
If you are just looking for a report of which poly2_IDs overlap poly_ID A then I'd suggest a spatial relator set to intersect, build a list then list explode.
+2Looks like you have a self intersecting polygon. It's a bow tie in the data.
If you add an AreaGapAndOverlapCleaner before the overlay and group by fme_feature_type it will repair the geometry and output the correct result.
Example of what a repair does.
+6- Participant
jlbaker2779 wrote:
Looks like you have a self intersecting polygon. It's a bow tie in the data.
If you add an AreaGapAndOverlapCleaner before the overlay and group by fme_feature_type it will repair the geometry and output the correct result.
Example of what a repair does.
Hello,
I have checked the geometry and I don't see bow tie. But I have 2 completely overlapping polygons.
+6- Participant
ebygomm wrote:
Do you actually want to intersect the polygons or just find the overlaps?
At the moment the polygons A,1&2 are sent into the area on area overlayer. One area is returned which is the area of polygon A which does not overlap any other polygon. The other area that is returned is the area of polygon A which overlaps both polygon 1 &2 (hence why overlaps says 3)
This is the shape returned where the poly2_ID is missing, it is the area that is not overlapped by any other polygon
If you are just looking for a report of which poly2_IDs overlap poly_ID A then I'd suggest a spatial relator set to intersect, build a list then list explode.
I have misinterpreted how AreaOnAreaOverlayer works.
Thank you for your help!
+32- Influencer
mario_bla wrote:
I have misinterpreted how AreaOnAreaOverlayer works.
Thank you for your help!
In the SpatialRelator ensure that you are building a list of all related IDs
Then use the ListExploder Transformer to explode this list and you will then have a record for each related candidate
+6- Participant
ebygomm wrote:
In the SpatialRelator ensure that you are building a list of all related IDs
Then use the ListExploder Transformer to explode this list and you will then have a record for each related candidate
Thank you again and sorry for taking your time. I just figure it out by myself and deleted the question probably at the same time as you were typing your answer. My mistake was that I was using list builder instead of building list from inside the spatialrelator...
Thanks again!
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