i am using the spatial filter to find all adjacent polygons to my chosen polygon. I am using the Touch option but it is also finding all diagonal polygons that only touch my chosen polygon corner to corner. I don't want to keep these polygons though. Is there a way to only get the polygons that are adjacent based on their sides only?
thanks
You can use the SpatialRelator with the "Calculate Cardinality of Intersections" option to know detailed condition of the spatial relationship.
See the help. (http://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_Desktop_Help.htm#../Subsystems/FME_Transformers/Content/Transformers/spatialrelator.htm)
Note: In FME 2014, there is a bug on the cardinality calculation. I recommend you to use FME 2015 to do that.
Takashi
However, another thought I had was, what if I bevel the corners of the polygons to prevent them from touching? Is this possible, and if so, what transformer would I use to do this?
This procedure could be a workaround.
1) Create vertex points of the polygon with the Chopper.
2) Transform the points into small circles with the Bufferer.
3) Clip the original polygon by the small circles to cut out its corners.
If u use cardinality you have to test for when only touches by line, you have to test fro card_line>0 AND card_point=0 (only if you only use TOUCHES criteria)
If the related_candidates_list has more then one element, you have to make more adjustements. (you can either test for more memebers with Ïf exists"etc.)
Or you can explode the list first and then use testers.
Of course you can also coerce one set to lines and use LineOnAreaOverlayer and test for overlaps>0.
