[fdo-internals] PostGIS and Spatial context question

Orest Halustchak orest.halustchak at autodesk.com
Wed Apr 9 08:48:28 EDT 2008

Hi Bruno,

The spatial context should also have the coordinate system wkt string. This information is used to look up the corresponding coordinate system definition in the Mentor catalog.


-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Bruno Scott
Sent: Wednesday, April 09, 2008 3:51 AM
To: fdo-internals at lists.osgeo.org
Subject: Re: [fdo-internals] PostGIS and Spatial context question

Forgot something
Using Mapguide Studio 2009 it works ok
See Screen capture

Bruno Scott wrote:
> PostGIS store its metadata in a table called geometry_columns
> For each of the spatialy enabled table we can specify a srid in this
> geometry_columns table.
> For PostGIS this srid is an integer that reference a coordinate system
> definition in a table called spatial_ref_sys.
> The actual implementation of the PostGIS provider that Matheus did, return
> something like
> PostGIS_SRID as spatial context ( where SRID is replaced by the proper
> srid integer )
> When i try to connect to PostGIS within Map2008 or Map2009, Map display an
> "Unknown" spatial context
> see screen capture
>  http://www.nabble.com/file/p16581335/AddDataToMap.jpg
> Is it normal?
> How map is suppose to know how to translate a PostGIS srid to a Mentor
> one?
> Bruno

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