Nothing
# Author: Julian Ramirez, dawnpatrolmustaine@gmail.com
# Date : December 2009
# Version 0.1
# Licence GPL v3
p8Calc <- function(rlist, rlist2, outfile, format='') {
if (!is.list(rlist)) {
stop('First argument should be a list or rasters (prec)')
} else if (!is.list(rlist2)) {
stop('Second argument should be a list or rasters (tmean)')
}
if (!file.exists(outfile)) {
cat("", "\n", "Mean temperature of wettest quarter (P8)", "\n")
PpTaStack <- stack(c(rlist, rlist2))
p8fun <- function(DataPixel) {
if(is.na(DataPixel[1])) {
return(NA)
} else {
q1 <- -9999
mnt12 <- -9999
for (wm in 1:12) {
i <- wm
j <- wm + 1
k <- wm + 2
PptDataPixel <- DataPixel[1:12]
TavDataPixel <- DataPixel[13:24]
if (j > 12) {j <- j-12}
if (k > 12) {k <- k-12}
assign(paste("q", wm, sep=""), PptDataPixel[i] + PptDataPixel[j] + PptDataPixel[k])
assign(paste("t", wm, sep=""), TavDataPixel[i] + TavDataPixel[j] + TavDataPixel[k])
}
mnt1 <- 1
wet1 <- q1
for (wm in 1:11) {
j <- wm + 1
assign(paste("mnt", j, sep=""), if (get(paste("q", j, sep="")) > get(paste("wet", wm, sep=""))) {j} else {get(paste("mnt", wm, sep=""))})
assign(paste("wet", j, sep=""), if (get(paste("q", j, sep="")) > get(paste("wet", wm, sep=""))) {get(paste("q", j, sep=""))} else {get(paste("wet", wm, sep=""))})
}
wetm <- mnt12
for (wm in 1:12) {
assign(paste("xx", wm, sep=""), if (wetm == wm) {get(paste("t", wm, sep=""))} else {-9999})
}
res <- round(max(xx1,xx2,xx3,xx4,xx5,xx6,xx7,xx8,xx9,xx10,xx11,xx12) / 3)
return(res)
}
}
p8 <- raster(PpTaStack, 0)
filename(p8) <- outfile
pb <- pbCreate(nrow(PpTaStack), type='text', style=3)
for (rw in 1:nrow(PpTaStack)) {
rowVals <- getValues(PpTaStack, rw)
RasVals <- apply(rowVals, 1, p8fun)
p8 <- setValues(p8, RasVals, rw)
p8 <- writeRaster(p8, outfile, format=format, overwrite=TRUE)
pbStep(pb, rw)
}
pbClose(pb)
rm(PpTaStack)
} else {
cat("", "\n", "File bio_8 already exists, skipping calculation, but loading", "\n")
p8 <- raster(outfile)
}
return(p8)
}
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