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.
Pierre > -----Original Message----- > From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users- > boun...@postgis.refractions.net] On Behalf Of JamesH > Sent: Wednesday, April 25, 2012 7:34 PM > To: postgis-users@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 > -- > View this message in context: http://postgis.17.n6.nabble.com/MapAlgebra-on- > three-Rasters-tp4917643p4918408.html > Sent from the PostGIS - User mailing list archive at Nabble.com. > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
