[postgis-users] Importing tiles in PostGIS raster

[Bryce L Nordgren]

postgis-users-bounces at postgis.refractions.net wrote on 08/18/2011 08:58:29 
AM:

> Hi,
> 
> I want to import a raster image in PostGIS. Now my raster image is 
already 
> split into tiles and I can't see how I can handle those images with 
> raster2pgsql.py. Currently the filenames are x_y.jpg where x and y 
> refer to the 
> coordinate of the upper left corner. How can I import those images using 
the 
> correct coordinates? All examples just mention the SRID and no 
positions.

Raster assumes you're using a geospatially aware format. Hence, given the 
metadata in the file, it can position the entire image correctly. In this 
case, it means that each individual x_y.jpg will be correctly positioned. 
You can also access pixels by real-world-coordinate fairly easily. 
Preserving the original pixel indices is not its strong point. Each tile 
starts at (1,1) (or (0,0) can't remember which).

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