[mapguide-users] 1.2.0 Beta and overriding coordinate systems?

[Dave Wilson]

The override does work in some instances, but not consistently from what
we have seen so far in MGOS Beta. MySQL is a special case if you are
using non-FDO datastores (native MySQL geometry). The override appears
to be ignored and hence the previews don't display, but added to a map
of the correct coordinate system with the correct extent it will
preview. I don't believe it will transform, but we haven't tested that.
 
Although I understand most collected point data will likely be Lat Lon
this is no longer a restriction in an ODBC datasource. If you capture
your data in another coordinate system or convert it prior to storing it
you can just specify that in your ODBC FeatureSource connection and
avoid the transformation. MG 6.5 had the Lat Lon restriction for point
data.
 
I believe the fastest retrieval will occur from MySQL Spatial Point
Geometry using an FDO datastore. I suspect ODBC will be the slowest
depending on the dataset size, but have yet to actually confirm that.
Native MySQL probably lies somewhere in between.
 
Dave

  _____  

From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Andy
Morsell
Sent: Friday, April 27, 2007 11:08 AM
To: 'MapGuide Users Mail List'
Subject: [mapguide-users] 1.2.0 Beta and overriding coordinate systems?



Hi, 
Is the new overriding coordinate system of feature source functionality
currently broken in 1.2.0 beta 1?  I saw a note for MGE beta that stated
such and I just tried it in MGOS beta with a MySQL geometry field while
setting an LL override and it did not appear to work.  So, is this a
known problem in the current MGOS beta as well?  I'm very curious to
find out what will perform better: an ODBC data connection to MySQL with
lat lon fields defining geometry, or a MySQL connection with point
geometry with a coordinate system override.  In both cases, the layer is
being embedded into a state plane map so a coordinate transformation has
to occur.  My preliminary tests of just previewing the layers indicates
that MySQL geometry performs better.

Thanks. 

Andy Morsell, P.E. 
Spatial Integrators, Inc. 
http://www.SpatialGIS.com <http://www.SpatialGIS.com>  

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