Enhancement request - Minimum Bounding Circle for PostGIS

[rind...@…]

Here is a proposed new function for Minimum Bounding Circle in PostGIS 1.4.

This can be added to lwpostgis_upgrade.sql and lwpostgis.sql since it is

all a stored procedure. The results of the function is a polygon buffer representing the minimum bounding circle. The default buffer has 192 verticies but this can be increased. The Roeck test can be easily computed from this function. See  http://postgis.refractions.net/pipermail/postgis-users/2008-October/021713.html

The procedure can be improved by adding a Maximum diameter function in GEOS (not easy ?) and changing my construction of a 3 point circle to a direct solution.

[rind...@…]

Revised function using ST_* functions

[robe]

Plan to rename this to ST_MinimumBoundingCircle if no one has issues with that.

[robe]

Committed also revised to support geometries that have line and point convex hulls. Also added to documentation.

[rind...@…]

 http://postgis.googlecode.com/issues/attachment?aid=-5289057741154515144&name=MBC.txt

[robe]

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[rind...@…]

 http://postgis.googlecode.com/issues/attachment?aid=-2960819719782441265&name=MBC.txt