library("raster")
elev = raster(nrow = 6, ncol = 6, res = 0.5,
xmn = -1.5, xmx = 1.5, ymn = -1.5, ymx = 1.5,
vals = 1:36)
grain_size = c("clay", "silt", "sand")
grain = raster(nrow = 6, ncol = 6, res = 0.5,
xmn = -1.5, xmx = 1.5, ymn = -1.5, ymx = 1.5,
vals = factor(sample(grain_size, 36, replace = TRUE),
levels = grain_size))
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