[postgis-users] MapAlgebra on three Rasters

[JamesH]

Have resolved this MapAlgebra issue, the issue was with the slope surface, I
was trying to produce as a 32BF but it needed to be 32BSI to be visible.

Calculation and resample ran effectively using:

CREATE TABLE Metro_location2 AS(
SELECT
	ST_MapAlgebraExpr(ST_Resample(a.rast, b.rast), 1, b.rast, 1, '([rast1] *
0.2) + [rast2]', '32BF') as rast, 1 as rid
FROM
	Slope a, DensDist b
		);

To produce this final Raster:
http://postgis.17.n6.nabble.com/file/n4931130/Metro.png 

This is the product of three standardises/Normalised Rasters: a Slope
surface, Point Density and Euclidean Distance. 
Each was then weighted and combined together into one Raster showing the
most suitable locations in Newcastle for a proposed new Metro Station (in
red).

Kind Regards,
James

-----
GIS Undergraduate
--
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