[postgis-users] GML > PostGIS

Peter Brewer p.brewer at cornell.edu
Wed Jan 7 11:25:01 PST 2009


Thanks for the prompt reply.

The schema is being developed and is open to suggestions.  At the moment 
we are keeping it ultra simple and just specifying the following element 
in the relevant locations:

<xs:element name="locationGeometry">
<xs:element ref="gml:Point"/>
<xs:element ref="gml:Polygon"/>

The full schema is at: http://tridas.org/1.0/tridas.xsd

I know it would be pretty simple to parse gml:Point and gml:Polygon 
myself, but I'd rather not reinvent the wheel.  Besides, I imagine that 
in the future we'll extend the schema to support full SF-GML so I was 
hoping someone would have already written a SF-GML>PostGIS converter.

Best wishes


Martin Davis wrote:
> Do you have a fixed schema?  Can you post an example GML document?
> Peter Brewer wrote:
>> Hi All,
>> I'm writing a webservice that reads and writes (amongst other things)
>> location data to/from a Postgres/PostGIS database.
>> Outputting the data as GML from the database is easy using the asGML()
>> PostGIS function.  What I'm pondering over is how to write data to the
>> database when sent by the user in GML format.
>> GDAL/OGR doesn't seem to allow GML > PostGIS conversion.  Any ideas how
>> I can do this?  I'm restricting users to the 'Simple Features' subset of
>> GML so I only need to be able to write points, lines and polygons to the
>> database.  Am I really stuck with parsing the GML myself and writing
>> PostGIS SQL statements?  It doesn't seem enormously difficult so I'm
>> wondering why there isn't a library to do this already.
>> Any help or pointers much appreciated
>> Cheers
>> Peter
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