[postgis] distance(geometry,geometry) function

[Dave Blasby]

Due to popular demand, I've added the function;

distance(geometry,geometry)	
	:- finds the minimum distance between the two geometries

now you can do things like;

select * from <table> where distance(<geometry col>,'POLYGON(0 0, 0 10,
10 10, 10 0, 0 0)') < 10.0;

which will find anything that is within 10 units of the given polygon.

This will greatly increase the complexity of spatial queries users will
be able to perform.

I'm still testing it; it should hit the CVS version in the next few
days.

dave

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