[Community] ZCatalog spatial index

[Sean Gillies]

Eric Bréhault wrote:
> Hello,
> 
> Did anybody already tried to implement a spatial index to handle spatial
> operators directly in the ZCatalog ?
> I want to try to do it, but if anybody has some feedback and/or idea about
> it, it would help.
> 
> Regards,
> 
> Eric

Shaun Walbridge and I worked on

   http://trac.gispython.org/projects/PrimaGIS/browser/SpatialIndex

at the 2006 Plone Conference sprint. The tests should be 
self-explanatory. The one obstacle for us at the time was that there 
wasn't a way to persist the index, which means that it's not really 
ready for production.

Now, there is an alternative index

   http://trac.gispython.org/projects/PCL/wiki/ArrTree

which *can* be persisted (to a file on disk), and would be a better 
foundation for a Zope spatial index. It's been on my to-do list for a 
while. My Pleiades project has ~1000 features now, but will need a 
spatial index before it can grow much larger.

Cheers,
Sean