Which transformer would you use to extract just the fire hydrants (points) that fall within a single neighborhood (polygon) from a larger city-wide dataset of fire hydrants?

• A. Aggregator
• B. Bufferer
• C. Dissolver
• D. Clipper

Answer: (D)

Clipping features by a polygon boundary lets you keep only those input features that fall inside the clipping geometry. To obtain hydrants within a single neighborhood, use the neighborhood polygon as the clip feature and feed the city-wide hydrants as the input. The Clipper outputs only the hydrants that lie inside the polygon, discarding everything outside. The other transformers wouldn’t achieve this specific inside-boundary extraction: Aggregator groups features by attributes, Bufferer creates an area around features, and Dissolver merges polygons. So the Clipper is the right choice.