Code a web service with python/postgis

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Dear all,

I would like code a web service with python. I have already imported several
vector data 
(land cover) and one Digital Elevation Model (raster layer) into my
postgresql/postgis 
database (server side).

I succeed in connecting to my pg db via psycopg2.

Client side, operators use a client application (Developed with PHP /
javascript / 
openlayers).

Objectives :  Client side, once the layer would be selected,and once the
operators have 
clicked on the map  , they would like that usefull informations appear on
the interface 
of the client application(kind of land cover, z of the DEM).


=> Regarding my python script, i have to type a SQL query in order to select
usefull 
informations of the db layers. And, of course, the information must  depend
on geographic 
coordinates (Latitude Y/Longitute X).
In a 2nd time, my script must  produce a result(JSon type) for the client
side.


It would be possible to help me regarding the coding in order to select
usefull 
informations of the db layers. (depends on geographic coordinates x/y  ?
Could you throw 
light for me regarding the way to do this SQL query ?

In advance, thank you to throw light for me.



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