+1Dear FMExperts,
I am using the AreaGapAndOverlapCleaner transformer to find geometric issues within a polygon dataset. I can output a list of all the features affected, but what I would really like to achieve is to produce a list of each instance where a geometric error has been discovered, what the issue is, plus the coordinates for the location.
So something like this for each found error:
FEATURE_IDISSUEXY123Gap123654244440124Gap123887249486124Overlap6454772757154
TIA,
R
Best answer by daveatsafe
Hi @robinb,
You can send both the initial and AreaGapAndOverlapCleaner output polygons into an AreaOnAreaOverlayer transformer. Enable Generate List, then choose FEATURE_ID for the attribute to add to the list.
Any overlayer output polygons with only 1 for the _overlap value will be a filled in gap. You can use Tester to extract these, then an AreaCalculator to get the gap area and a CenterPointExtractor to get the coordinates of a point inside the filled gap polygon.
Any output with more than 2 for the _overlap value will be an overlap in the original data. If you just want a single output for each overlap, you can just measure the area and extract a location like you did for the gaps. If you want an error for each polygon in the overlap, please use a ListExploder to create a copy for each list entry, then a DuplicateFilter to remove the duplicate IDs from the gap cleaned polygons.
+44Hi @robinb
Could you share us a amount of Reader to try to simulate this?
Thanks,
Danilo
+1Hi @danilo_fme
Do you mean provide a sample of the input data for the workbench? If so, it is confidential client data but I could mock up an example of this.
Thanks,
Robin
+44Hi @danilo_fme
Do you mean provide a sample of the input data for the workbench? If so, it is confidential client data but I could mock up an example of this.
Thanks,
Robin
Hi @robinb
Not problem!
Could you provide a example?
Thanks,
Danilo
+19Hi @robinb,
You can send both the initial and AreaGapAndOverlapCleaner output polygons into an AreaOnAreaOverlayer transformer. Enable Generate List, then choose FEATURE_ID for the attribute to add to the list.
Any overlayer output polygons with only 1 for the _overlap value will be a filled in gap. You can use Tester to extract these, then an AreaCalculator to get the gap area and a CenterPointExtractor to get the coordinates of a point inside the filled gap polygon.
Any output with more than 2 for the _overlap value will be an overlap in the original data. If you just want a single output for each overlap, you can just measure the area and extract a location like you did for the gaps. If you want an error for each polygon in the overlap, please use a ListExploder to create a copy for each list entry, then a DuplicateFilter to remove the duplicate IDs from the gap cleaned polygons.
+1Hi @robinb,
You can send both the initial and AreaGapAndOverlapCleaner output polygons into an AreaOnAreaOverlayer transformer. Enable Generate List, then choose FEATURE_ID for the attribute to add to the list.
Any overlayer output polygons with only 1 for the _overlap value will be a filled in gap. You can use Tester to extract these, then an AreaCalculator to get the gap area and a CenterPointExtractor to get the coordinates of a point inside the filled gap polygon.
Any output with more than 2 for the _overlap value will be an overlap in the original data. If you just want a single output for each overlap, you can just measure the area and extract a location like you did for the gaps. If you want an error for each polygon in the overlap, please use a ListExploder to create a copy for each list entry, then a DuplicateFilter to remove the duplicate IDs from the gap cleaned polygons.
Wonderful Dave, that's just what I need. Thanks, Robin
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