Looping a list to clip features

You won’t need to loop. you should be able to use the PointCloudExpressionEvaluator to build an expression that sets a component on the pc to the appropriate index

https://docs.safe.com/fme/2024.2/html/FME-Form-Documentation/FME-Transformers/Transformers/pointcloudexpressionevaluator.htm

even something as simple as getting the floor of the z value should give you what you need.

floor(0.7) = 0
floor(9.32) = 9
floor (10.01) = 10

Hi ​@koala_pond_03 ,

I assume that you have polygon features with an attribute called e.g. “canopy_height” that stores the canopy height value, and you want to remove area overlapping with other higher canopy polygons from every polygon.

If I understand requirement correctly, AreaOnAreaOverlayer and list operations could be a simple solution.

1. Send all the canopy polygon features into an AreaOnAreaOverlayer.
   • Accumulation Mode: Drop Incoming Attributes
   • Generate List: [check]
   • List Name: _list (for example)
   • Add to List: All Attributes
2. ListSorter: Sort the list elements by canopy height desecnding.
   • List Attribute: _list{}.canopy_height
   • Sort Type: Numeric
   • Sort Order: Descending
3. ListIndexer: Extract the first elements of the list as feature attributes.
   • List Attribute: _list{}
   • List Index to Copy: 0

Hope this helps.

Many thanks to ​@hkingsbury and ​@takashi for the help. I’ll look into these ideas this week. Cheers!