I have an FME workflow that extracts planning overlays against the cadastre/properties. Some properties could have 5 or more planning overlays. I am currently using AreaOnAreaOverlay transformer and then a ListExploder to get all planning overlays against each property, otherwise not all overlays appear for some reason. ListExploder seems to show all overlays against each property but it duplicates certain overlays. It doesn't matter which transformer I use to remove the duplicates, the result still has duplicates. Also, when joining the result to the rest of my workflow I have a feeling it chews up too much memory due to the listexploder as I get a non-descript translation error, which online forums suggest it is due to memory usage. What's the best way to show all distinct overlays without duplicates?
Unable to output Planning Overlays against Properties - either not all show or I get duplicates.
+34
- Celebrity
- 2388 replies
-
19 January 2024
I understand what is happening, but I do not understand the result you expect. If you have one parcel overlapped with 2 planning overlays, how many results do you expect?
Because this is what the AreaOnAreaOverlayer does. It creates a set of not overlapping areas from the input. To get to the unique parcel vs planning combinations, you can create a list and explode the list. The duplicates you find might be created from the same plan cutting the same parcel multiple times?
If you want to keep all parcels with its original geometry, and have a list with all plans it intersects, you can probably better use the SpatialRelator. You probably need to create a list and explode it, but the parcels stay intact.
+34
- Celebrity
- 2388 replies
-
19 January 2024
I understand what is happening, but I do not understand the result you expect. If you have one parcel overlapped with 2 planning overlays, how many results do you expect?
Because this is what the AreaOnAreaOverlayer does. It creates a set of not overlapping areas from the input. To get to the unique parcel vs planning combinations, you can create a list and explode the list. The duplicates you find might be created from the same plan cutting the same parcel multiple times?
If you want to keep all parcels with its original geometry, and have a list with all plans it intersects, you can probably better use the SpatialRelator. You probably need to create a list and explode it, but the parcels stay intact.
Attached sample demontrating this.
+4
- Contributor
- 12 replies
-
20 January 2024
I understand what is happening, but I do not understand the result you expect. If you have one parcel overlapped with 2 planning overlays, how many results do you expect?
Because this is what the AreaOnAreaOverlayer does. It creates a set of not overlapping areas from the input. To get to the unique parcel vs planning combinations, you can create a list and explode the list. The duplicates you find might be created from the same plan cutting the same parcel multiple times?
If you want to keep all parcels with its original geometry, and have a list with all plans it intersects, you can probably better use the SpatialRelator. You probably need to create a list and explode it, but the parcels stay intact.
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