Doesn’t the second example (One raster, several bands) similar to your case in the doc?
http://postgis.net/docs/RT_ST_MapAlgebra.html Pierre From: postgis-users [mailto:[email protected]] On Behalf Of David Haynes Sent: Tuesday, November 17, 2015 9:48 AM To: [email protected] Subject: [postgis-users] Raster calculation on 3d raster (stack) Hello, I have a mulibanded raster and I am wondering if I can apply any of the raster processing functions (min, max, mean, stdev) to multibanded rasters. Specifically, I am wondering if these functions will be able to applied to the z-axis. Here is an example, I have worked up in python starting with two 2d arrays. x = [[1,4,5,6], [3,5,6,2]] z = [[2,7,8,9], [8,3,5,9]] convert to np.array y = np.dstack((np.array(x), np.array(z))) >>> y.sum(2) array([[ 3, 11, 13, 15], [11, 8, 11, 11]]) I want to apply the raster processing functions to the z-axis and I am wondering if I can do it in PostGIS? It seems like the mapalgebra call back functions could do this, but I am having difficulty finding an example.
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