<div>Dear friends, <br>I have a geographical database in the PostreSQL 8.1 <br>I have realized some test with positional operators in the postgis <br>e.g.:</div>
<div> for two geographical features (A and B), we have the following positional operators:</div>
<div> </div>
<div>completely at-left A << B<br>completely at-right A >> B</div>
<div>
<div>at-left or overlaps at-left A &< B</div>
<div>
<div>at-right or overlaps at-right A &> B</div></div></div>
<div> </div>
<div>completely above A |>> B</div>
<div>completely below A |<< B</div>
<div>above or overlaps above A |&> B</div>
<div>below or overlaps below A &<| B</div>
<div> </div>
<div> </div>
<div>North-West A |>> B AND A << B<br>North-Est A |>> B AND A >> B<br>South-West A <<| B AND A << B</div>
<div>South-Est A <<| B AND A >> B</div>
<div> </div>
<div> </div>
<div>but, how I can to express the North-of, South-of, Est-of and West-of positional operators? <br> <br>somebody can help me <br>thanks for your attention <br>best regards <br>Joel</div>
<div> </div>
<div><br> </div>