Buffer (GIS)
Encyclopedia
A buffer in GIS is a zone around a map feature measured in units of distance or time. A buffer is useful for proximity analysis
Proximity analysis
Proximity Analysis is an analytical technique used to determine the relationship between a selected point and its neighbors. Proximity analysis is a crucial tool for business marketing and site selection. Marketers analyze demographics and infrastructure to determine trade areas...

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A buffer is an area defined by the bounding region determined by a set of points at a specified maximum distance from all nodes along segments of an object.
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