#FunciĆ³n AS1 para MODIS
AS1modis <- function(NIR, SWIR, SWIR2){
AS1Index <- overlay(NIR, SWIR, SWIR2, fun=function(x,y,z){
a <- (sqrt((1.240-0.858)^2+(y-x)^2))
b <- (sqrt((1.240-1.640)^2+(y-z)^2))
c <- (sqrt((1.640-0.858)^2+(z-x)^2))
d <- (a^2+b^2-c^2)/(2*a*b)
d2 <- ifelse(d > 1, 1, ifelse(d < -1, -1, d))#revisar esta sentencia
ind <- acos(d2)
return(ind)
})
return(AS1Index)
}
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