[postgis-users] Roeck test

[Martin Davis]

Wouldn't it be easier and more accurate to use the convex hull of the 
polygon instead of the minimum enclosing ball? The CH will have smaller 
area (i.e. be a tighter bound on the area covered by the polygon), so it 
seems like it would give a more accurate basis for comparison.

Lee Meilleur wrote:
> Has anyone calculated the Roeck test using PostGIS?  This is an area based measure that computes the ratio of the area of a polygon to the area of the minimum enclosing circle for the polygon.  It's used to measure compactness of districts for redistricting applications, basically a way to test for gerrymandering.  Thanks.
>
> Lee Meilleur
> LCC-GIS Office
> Minnesota Legislature
> 100 Rev. Dr. MLK Jr Blvd.
> 55 State Office Building
> St. Paul, MN 55155
> 651.296.0098  Fax: 651.297.3697
> lee.meilleur at gis.leg.mn
> http://www.gis.leg.mn
>
>
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-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022