[Gdal-dev] Question about retreving a image from a geodatabase

[Frank Warmerdam]

Douglas Coward wrote:
...
>   My question is can anyone give me an example of the queries and the 
> responses when a
> visualization application starts with a geographical rectangle and wants 
> to query a PostGIS database for a raster image trimmed to fit that 
> rectangle and how the image is returned to the application ready to be 
> displayed?
>    Being more specific....
>   Is a raster image, like a landsat image, actually stored in the 
> database, or is the image stored local to application and represented in 
> the database by a bounding rectangle and the local filename?
>   What happens when the queried rectangle overlaps more than one 
> database image? How are the pieces composited together into one image?
>   My only assumption right now is that the process begins with the 
> application sending an SQL query through OGR to the PostGIS libraries 
> for the rectangle in question. Beyond that I'm lost.

Douglas,

GDAL does not support rasters in Postgres or an ArcGIS Personal Geodatabase.
So I can't provide examples.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGF, http://osgeo.org