I would like to use SqlAlchemy with PostGIS to create, read, update,
and query spatial data.  I have search around a bit and found a few
ideas of doing this [1][2] but I haven't seen a definitive best
practice by any means.  It looks like all the solutions I can find
have a least some limitations.

Is anyone here using SqlAlchemy with spatial databases and if so how
are you doing it right now?

Specifically:
- How do you handle table specification with geometry types?
[1] tries to do this but it is incomplete

- Do you use custom types and if so how are you doing this?
[2] has some custom type code but it seems to be tied to binary
formats and I don't see how to create/retrieve the geometry in text
format.

- How are you handling the object mapping?
For example is there a way to map a "POINT" geometry to a python Point
class or tuple?

- Do you have any general recommendations for how to use spatial data
successfully with SqlAlchemy?


Thanks,
Allen

[1] 
http://www.mail-archive.com/[email protected]/msg03371.html
[2] http://bycycle.org/2007/01/29/using-postgis-with-sqlalchemy/


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