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
[EMAIL PROTECTED]
http://www.gis.leg.mn
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--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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