how to complete ? Aggregator?

Have a look at the SpatialRelator - https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/spatialrelator.htm

The 2023 data will be the Requestor and the 2025 data will be the supplier. You can set what spatial predicate you’d like to test for and then configure it to merge attributes. In your case it’s probably best to prefix the supplier as you can then clearly differentiate the 2025 attributes from the 2023

thanks ​@hkingsbury  much appreciated. that transformer SpatialRelator worked well.

one questions i have now though is why doesn’t the number of records match the original number from my requestor (Ie. where does the 1880,628 - 1823,324 = 57, 004 go? ) or what happens to them? how can i check  that those records are all there in my outcome ? as using this transformer the geometry should not change?

I know they are not the same as those in the rejected - as I checked and rejected is the records from the Supplier which dont relate with the Requestor.

Maybe I have to change something in the parameters? (see below for my setup)

I have tried this with different settings with “spatial predicates to test” and this get the same 1823,324 as outcome

any help is appreciated,

thanks again,

Curtis