SELECT ST_Slope( ST_MapAlgebraExpr(ST_AddBand(ST_MakeEmptyRaster(10, 10, 0, 0, 0.1, 0.1, 0, 0, 4269), '8BUI'::text, 1, 0), '32BUI', '([rast.x] - 1) * 10 + [rast.y]') , 1, '8BUI')
works for me. Make sure st_slope(rast raster, band integer, pixeltype text) exsit as a function. Pierre > -----Original Message----- > From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users- > boun...@postgis.refractions.net] On Behalf Of JamesH > Sent: Tuesday, March 06, 2012 9:08 AM > To: postgis-users@postgis.refractions.net > Subject: [postgis-users] ST_Slope > > Hello all, > > I am trying to produce a slope surface raster from a tiff. > > The raster has 1 band, pixeltype is 8 bit unsigned integer but I cannot get > the > function to work. > > Have tried variances of: > > SELECT > ST_Slope(rast, 1, '8BUI') or (rast, 1, 8) FROM > nclraster > > But PostGIS returns ERROR: function st_slope(raster, integer, integer) does > not > exist LINE 2: ST_Slope(rast,1,8). > > Any pointers as to where I'm going wrong much appreciated > > James > > -- > View this message in context: http://postgis.17.n6.nabble.com/ST-Slope- > tp4551303p4551303.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
