[postgis] distance(geometry,geometry) function

[Timothy H. Keitt]

I assume you mean euclidean distance.  A lot of us keep our locations in 
geodetic coordinates.  It would be nice if geometries could reference a 
particular datum so these things would be handled transparently. 
 (Postgis is nonetheless a very exciting development.)

Cheers,
Tim

Dave Blasby wrote:

>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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>

-- 
Timothy H. Keitt
Department of Ecology and Evolution
State University of New York at Stony Brook
Stony Brook, New York 11794 USA
Phone: 631-632-1101, FAX: 631-632-7626
http://life.bio.sunysb.edu/ee/keitt/




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