A zoning amendment would add a ten-foot setback from waterways. Which method should you use to present a spatial analysis of the ordinance's impact?

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Multiple Choice

A zoning amendment would add a ten-foot setback from waterways. Which method should you use to present a spatial analysis of the ordinance's impact?

Modeling a fixed setback distance from a linear feature is done with a buffer. For a ten-foot setback from waterways, you would create a Euclidean buffer around the waterway line by 10 feet in a projected coordinate system. That buffer yields a polygon that exactly represents the regulatory zone where development would be restricted, making it easy to see which parcels or areas fall inside the setback when you overlay with parcel data. Geodesic buffers use distances measured along the earth’s surface, which can create slightly different shapes at local scales and is less typical for precise local setbacks. A polygon overlay, while useful for combining the setback with parcels to identify affected properties, doesn’t itself define the setback area. A vector distance measurement is a distance calculation, not a zone that represents the regulatory boundary.

Modeling a fixed setback distance from a linear feature is done with a buffer. For a ten-foot setback from waterways, you would create a Euclidean buffer around the waterway line by 10 feet in a projected coordinate system. That buffer yields a polygon that exactly represents the regulatory zone where development would be restricted, making it easy to see which parcels or areas fall inside the setback when you overlay with parcel data.

Geodesic buffers use distances measured along the earth’s surface, which can create slightly different shapes at local scales and is less typical for precise local setbacks. A polygon overlay, while useful for combining the setback with parcels to identify affected properties, doesn’t itself define the setback area. A vector distance measurement is a distance calculation, not a zone that represents the regulatory boundary.

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