[postgis-devel] Re: Q3C

[Martin Davis]

Hmmm.

How will you handle indexing geometries which cross the dateline (which 
includes crossing the poles)?

Paul Ramsey wrote:
> On Wed, Mar 18, 2009 at 2:41 PM, Paul Ramsey <pramsey at opengeo.org> wrote:
>   
>> I'm having a grand time thinking about what the appropriate return
>> value of geography::geometry is :)
>>     
>
> My current thought is an automagical planar projection into an
> appropriate UTM zone or polar stereographic system, based on the
> centroid of the feature. With the extra complication of first looking
> into the projection cache to see what the last projection used was,
> and if it's close enough, using that. Hopefully that way, in the case
> of st_function(geog1, geog2) the two arguments would be both cast into
> the same plane. This would magically allow the geography module to
> make use of all the geometry functions, and only break for really
> large objects that exceed our chosen planar areas.
>
> P.
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>   

-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022