[mapguide-users] OGR Provider w/ PostGIS Support

Andrew DeMerchant andrew.demerchant at gemtec.ca
Tue Jun 27 16:09:35 EDT 2006

Same thing here...I can't seem to get any of my points to show up, no 
matter what I do. Anyone have a step by step guide, incase we're missing 
something? I've got my data in, and have "Geometry" checked for my 
table...I have a northing and an easting field as well as a projection. 
Made a new layer using that data, and told Studio to use "Geometry" for 
Geometry (seemed logical enough!)...but nothing shows up in my preview.


Curtis W. Ruck wrote:

>Wow, thanks, i added the view into the geometry columns table and it appears in mapguide....
>Also date fields showup in mapguide studio...
>the server stops crashing now that i can place a filter on the data...
>Now i just can't get the layer of dots from my massive table ran though a view and filtered to appear on the map (ajax).  (The DWF viewer doesn't even show the other raster layers).
>I have the style set to 0 to Infinity with a  black dot.... this query should have approximately 1000 dots showing...
>Curtis Ruck
>Curtis W. Ruck wrote:
>>I know the OGR Provider w/ PostGIS is kinda new.  Because I think the
>>mapguide set of tools has the best interface and ease of use I want to see
>>it survive.
>>I am currently having a few issues with this: 
> > 1) When i setup the data
>>layer in MapGuide Studio i can't choose a view from postgres.  I can only
>>choose a table.  As a workaround i wanted to see if i could filter the
>>data, which brings me to number 2 
>I have reviewed the OGR Postgres/PostGIS driver code, and it seems that
>if a named view were listed in the geometry_columns table it would
>get listed as a layer of the file.  I haven't tried this myself to verify.
>The following query is used to get a list of all tables/views to be
>represented as layers through OGR.
>SELECT c.relname FROM pg_class c, geometry_columns g
>         WHERE (c.relkind in ('r','v') AND c.relname !~ '^pg'
>                     AND c.relname::TEXT = g.f_table_name::TEXT)
>I think this selects all relations (tables) of type 'r' or 'v' (which
>I assume is table and view) for which the name does not start with 'pg'
>and for which the name is in the geometry_columns table.
> > 2) I want to filter the data on a
>>timestamp field.  In the MapGuide Studio interface i can't select the
>>timestamp field to do a filter with.
>OGR 1.3.2 does support postgres timestamp fields internally as a date field.
>Possibly date type fields are not handled properly by the OGR FDO provider?
> >  3) Because i can't do the two top
>>items, its crashing the mapguide server because the table i am trying to
>>draw on the screen has some odd 300,000 records all with a geometry column.
>>Other than that though it looks good, just wish it would work.
>Crashing?  Hmm, I would have expected it just to be slow.
>Best regards,

	*Andrew DeMerchant*
*Computer Technologist*
ph.1-877-4GEMTEC x.163
fax 506-453-9470

/GEMTEC Limited <http://www.gemtec.ca>
/191 Doak Road
Fredericton, NB, Canada
E3C 2E6

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