#FunciĆ³n ARE3 para Sentinel 2
ARE3sentinel <- function(RedEdge2, RedEdge3, NIR){
ARE3Index <- overlay(RedEdge2, RedEdge3, NIR, fun=function(x,y,z){
a <- (sqrt((0.783-0.740)^2+(y-x)^2))
b <- (sqrt((0.842-0.783)^2+(z-y)^2))
c <- (sqrt((0.842-0.740)^2+(z-x)^2))
d <- (a^2+b^2-c^2)/(2*a*b)
d2 <- ifelse(d > 1, 1, ifelse(d < -1, -1, d))
ind <- acos(d2)
return(ind)
})
return(ARE3Index)
}
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