[postgis-users] Spatial operators

[Paul Ramsey]

Luis Mota wrote:
> Hi everyone.
> 
> I have a small question concerning the spatial operators: <<, >> , &> 
> and <&.
> 
> In the online documentation, I understood that, with these operators, we 
> can compare the relative position of two geometries, in a strict or 
> overlaping way.

There is definately nothing strict about those operators. They compare 
bounding boxes, period. Strict comparisons will be done with the 
Relate() and associated functions, once we have our topological library 
ready.

P.

> 
> What I would like to ask is what these concepts of 'left' and 'right' 
> mean... Is this relative to the X-axis? I ask this because I made some 
> tests and that's what I figured out... In this case, are there operators 
> that deal with the Y-Axis?
> 
> Bye and thanks, Luís Mota
> 
> 
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      | Paul Ramsey
      | Refractions Research
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