[postgis-devel] Re: Q3C
mbdavis at refractions.net
Wed Mar 18 16:16:11 PDT 2009
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.
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Senior Technical Architect
Refractions Research, Inc.
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