Which transformers are used together to perform spatial filtering in the described example?

• A. Bufferer and PointOnAreaOverlayer
• B. Bufferer
• C. PointOnAreaOverlayer
• D. Reprojector

Answer: (A)

Testing whether features are within a certain distance of others is done by creating a tolerance zone around one set of features and then selecting the features that fall inside that zone. The Bufferer builds that distance-based area around the reference features. The PointOnAreaOverlayer then checks each test feature (for example, points) to see if it lies on or inside those buffered areas and passes through only those that do. This combination directly performs the spatial relationship test you need: a distance-based filter.

Using just the buffer alone wouldn’t decide which test features belong to the other set, and using only the PointOnAreaOverlayer would require existing area geometry to overlay against. A Reprojector changes coordinates but doesn’t perform the spatial relationship filtering.