How to extract mean pixels values using circular samples in raster?

02 February 2017 0 10K Report

Dear RG Members,

I'd like to extract mean pixels values using x,y coordinates by defining a buffer or area surrounding individual point coordinate. My circular sample represents the radius of a circular region around each point. I try unsuccessfully this using extract function with raster package, in my hypothetical example:

require(raster)

require(sp)

require(plotrix)##Only for draw circular areas

## Create a raster

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