[postgis-devel] KNN c r d

maplabs at light42.com maplabs at light42.com
Tue Oct 18 01:10:46 PDT 2011

Hi All-

 ( I am giving a talk on Saturday to OSGeo California Chapter and ask 
anyone who cares to
to look at 3 pictures and see if they make sense.. )

  based on Regina's very dense and very informative post earlier,
I have come up with a visual representation of three ways to measure distance

  the images can be found at


  following the example,  

cbox  <->
rbox  <#>
dist   st_distance()

  the distances are from POINT to POLYGON

comments and questions welcome

Brian Hamlin
OSGeo California Chapter
415-717-4462 cell

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