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I have two polygons, one of parcels and one of building footprints. I am trying to merge the attributes of the parcels to the buildings. A Spatial Relator or Filter would be the obvious answer, but some of the building footprints overlap more than one parcel. I want to merge the attributes of the parcel the building is found MOSTLY within. In the case of the below picture, the red building is adopting the parcel attributes of #2. Is there a way I can prioritize the amount of overlap determining which attributes are joined, therefore adopting parcel 1?

 

Have a look at the AreaonAreaOverlayer transformer.

That is built for cases like this.

You might want to try the MaxOverlappingFeatureMerger transformer from the FME hub.

Another way to do a max area based spatial join is to use a clipper>sort it by descending area>filter the duplicates. So,

1. Clipper (Merge Attributes) - Clipper: red polygon building

2. AreaCalculator (from Inside port)

3. Sorter - _area by Numeric, Descending

4 DuplicateFilter - by unique id of building

So from the Unique port you should have the parcel (by largest area) attributes attached

Another way to do a max area based spatial join is to use a clipper>sort it by descending area>filter the duplicates. So,

1. Clipper (Merge Attributes) - Clipper: red polygon building

2. AreaCalculator (from Inside port)

3. Sorter - _area by Numeric, Descending

4 DuplicateFilter - by unique id of building

So from the Unique port you should have the parcel (by largest area) attributes attached

Good suggestion. In addition, if you need to preserve the original geometry of the building, you can use a pair of GeometryExtractor (before Clipper) and GeometryReplacer (after DuplicateFilter) to save and restore the geometry.

Another way to do a max area based spatial join is to use a clipper>sort it by descending area>filter the duplicates. So,

1. Clipper (Merge Attributes) - Clipper: red polygon building

2. AreaCalculator (from Inside port)

3. Sorter - _area by Numeric, Descending

4 DuplicateFilter - by unique id of building

So from the Unique port you should have the parcel (by largest area) attributes attached

Thanks, this accomplished what I needed

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