The Girth Index is the radius of the largest circle that can be inscribed within a polygon. The Girth Index is normalized using the Equal Area Circle (EAC) as follows...

The Girth Index is appropriate to use when...

- the analysis needs to estimate of the size of the largest footprint (i.e. building) that can be contained in a given polygon
- a measure of compactness is needed

Girth Index results for select shapes...