To illustrate a 50-foot setback from streams, the staff would create a map using which GIS concept?

Study for the AICP exam with the Planetizen AICP Test. Master concepts with multiple choice questions, hints, and explanations. Ace your exam!

Multiple Choice

To illustrate a 50-foot setback from streams, the staff would create a map using which GIS concept?

A buffer creates a distance-based zone around features. For illustrating a 50-foot setback from streams, you generate a 50-foot buffer around the stream lines. The resulting polygon represents all land within 50 feet of the streams, which is exactly the setback area you want to map. This distance is measured outward from the stream’s centerline, making it a straightforward way to visualize and analyze what land lies inside or outside the setback. You can then clip or overlay this buffer with parcels or zoning layers to see which properties or areas are affected. Other GIS concepts don’t fit as well here. Overlay combines data from multiple layers to show combined attributes but doesn’t create a distance-based boundary around features. Visibility analysis looks at what can be seen from a point or along a path, not at a fixed distance from streams. 3D Terrain handles elevation and three-dimensional representations, not planar setback zones.

A buffer creates a distance-based zone around features. For illustrating a 50-foot setback from streams, you generate a 50-foot buffer around the stream lines. The resulting polygon represents all land within 50 feet of the streams, which is exactly the setback area you want to map. This distance is measured outward from the stream’s centerline, making it a straightforward way to visualize and analyze what land lies inside or outside the setback. You can then clip or overlay this buffer with parcels or zoning layers to see which properties or areas are affected.

Other GIS concepts don’t fit as well here. Overlay combines data from multiple layers to show combined attributes but doesn’t create a distance-based boundary around features. Visibility analysis looks at what can be seen from a point or along a path, not at a fixed distance from streams. 3D Terrain handles elevation and three-dimensional representations, not planar setback zones.

More practice questions