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Longtitude wrapping problem with MBRContains
Posted by: Alastair James
Date: June 15, 2006 02:57AM

Hi there...

I am writing a mysql backend for a google maps app. The problem is: when you scroll when you try to request data when the left hand edge is at a positive lng and the right hand side is at a negative lng, the MBRContains function fails. I.e. if you have the map with the left hand edge over japan and the right hand edge over america, say for example x1=140, x2=-140.

Is there anyway of making MBRContains respect wrapping of the longtitude component?

The only way I can think at the moment is to check two seperate lng regions, i.e. in teh above example, (140 -> 180) and (-180 -> -140)... However I dont really want the performance hit this will give...

Any ideas?

Thanks

Alastair

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