core.raster.reduce (procNode)

Fold a layer of a raster to one number: the sum, mean, least or greatest of its cells.

Built from core.raster.read and core.reduce.

Inputs

• raster (Raster). The raster folded.
• layer (String). Default "height". The layer folded.
• op (one of sum, mean, min, max). Default "sum". How the cells fold.

Outputs

• value: the folded number.

Example

local raster = g.core.raster.new({ size = { x = 8, z = 8 }, resolution = 1, layers = { "height" } })
local raised = g.core.raster.blend({ raster = raster, value = 1.0 })
local mean = g.core.raster.reduce({ raster = raised, layer = "height", op = "mean" })

Every cell is 1 after the blend, so the mean is 1.