[postgis-users] Determining clusters of points

[Kevin Neufeld]

On 12/8/2010 3:58 PM, Sébastien Lorion wrote:
> ... So to be clear, even tho the points "interact" with a range of 40, 
> they are not clustered together with the function you sent.

Um ... no. Sorry, there is miscommunication happening here.

The recursive script I posted is checking if two points are within 80 
units of each other.   If you wanted to view the result as buffered 
areas, you would use a radius of 40, not 80.

So, if you wanted to have clusters where points are within 40 units of 
each other, you would view this using a radius of 20.

Make sense?
-- Kevin
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