+6Hi everyone,
I'm trying to check if polygons from Dataset A overlap with polygons from Dataset B in FME. I’ve attempted to use the SpatialFilter, but it only offers options like "intersects" or "touches." However, I specifically need to determine if the polygons are overlapping.
Has anyone encountered this issue or found a way to achieve this in FME? Any suggestions would be appreciated!
Thanks in advance!
Best answer by dustin
Depending on the version of FME you are using, you should be able to change the Support Mode to ‘Support All Predicates’, and the Overlaps option will appear.
+31Depending on the version of FME you are using, you should be able to change the Support Mode to ‘Support All Predicates’, and the Overlaps option will appear.
+6+31It’s possible you have aggregates within the data, which are not supported by the Overlaps predicate. Try using a Deaggregator prior to the SpatialFilter.
+6+31Another transformer to consider is the AreaonAreaOverlayer. You can choose to create a list of overlapping areas, which may be helpful to you.
+6+31It does require some post processing to analyze the results. What I normally do is create a list of an attribute which identifies Dataset A and Dataset B. This can either be the fme_feature_type format attribute, or you can create a ‘dataset identifier’ using a couple AttributeCreators prior to the AreaOnAreaOverlayer.
Once I have the list on the results, I use a ListConcatenator and test if that concatenation contains both ‘dataset identifiers’.
It’s a bit more complicated than a simple SpatialFilter, but I’ve found it is faster comparison when you are dealing with millions of features (which may not be your case).
