How to use Negative Distances in your Geospatial Buffer Analysis
Geospatial buffer analysis involves generating a polygon at a specified distance from a proposed feature to determine proximity. For example, a 100m buffer around a point feature creates a circle with a 100m radius. Similarly, a 50m buffer around a polygon feature creates a larger polygon – a polygon that encompasses the source feature.
However, did you know that you can also use a negative distance to create a buffer? That’s right! When you use a negative distance, such as -25m, to buffer a polygon feature, the result is a smaller polygon – a polygon that is inside the source feature.
HabitatZone = BufferOutside25 – BufferInside100
The total area of habitat available is equal to the area of the zone of available habitat (ie HabitatZone).
Check out the video to see the process in action with AutoCAD Map 3D.
Source: geoExpressions – How to use Negative Distances in your Geospatial Buffer Analysis
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