[postgis-users] SUM on rasters

Pierre Racine Pierre.Racine at sbf.ulaval.ca
Wed Oct 14 07:27:46 PDT 2015

If by "sum" you mean "merge" or "union" use ST_Union(). Be careful as the "sum" can exceed available memory if they are too many rasters in the table.

> -----Original Message-----
> From: postgis-users [mailto:postgis-users-bounces at lists.osgeo.org] On
> Behalf Of Stephen Crawford
> Sent: Monday, October 12, 2015 10:46 AM
> To: PostGIS Users Discussion
> Subject: [postgis-users] SUM on rasters
> Hi,
> I have a table of rasters.  I would like to SUM the entire table with
> one raster as the result. Can somebody point me in to the correct
> funtion to do this?
> Thanks,
> Steve
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