I am working with a raster and want to take values assigned to each
cell and sort them from largest to smallest, then cummulatively sum
them together (in order from largest to smallest). I'll then be
coding the individual cells such that the top 10% of the largest cell
values can be visualize with one color, the next 10% with another and
so on.
I have tried a number of schemes but am having trouble figuring out
how to chose the maximum value, code it and re-search the raster for
the next highest value without replacement. I am assuming this
requires a loop, unless there is a function that will do this
automatically.
Here is a sample dataset:
library(raster)
r <- raster(ncol=10, nrow=10)
values(r) <- runif(ncell(r))
Many thanks for any input,
Sara Maxwell
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Sara M. Maxwell, Ph.D.
UC Santa Cruz