[postgis-users] MapAlgebra on three Rasters

Pierre Racine Pierre.Racine at sbf.ulaval.ca
Fri Apr 27 09:17:50 PDT 2012

I would suggest you create intermediate tables with CREATE TABLE xxx AS and see the result of each operation one after the other in order to isolate the problem.


> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-
> bounces at postgis.refractions.net] On Behalf Of JamesH
> Sent: Wednesday, April 25, 2012 7:34 PM
> To: postgis-users at postgis.refractions.net
> Subject: Re: [postgis-users] MapAlgebra on three Rasters
> Sorry, I should have explained what I'm trying to do with the query.
> I'm taking the two rasters density and euclidean, normalising them both
> before multiplying normalised density by 0.5, multiplying normalised
> euclidean by 0.3 and then adding these together.
> Then I am producing a slope surface, normalising that
> and then multiplying the normalised slope by 0.2
> before using it along with the result of the first calculation to add
> effectively all three rasters together.
> Hope this explains better.
> Kind Regards,
> James
> -----
> GIS Undergraduate
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