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# Author: Julian Ramirez, dawnpatrolmustaine@gmail.com
# Date : December 2009
# Version 0.1
# Licence GPL v3
p19Calc <- 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", "Precipitation of Coldest Quarter (P19)", "\n")
PpTaStack <- stack(c(rlist, rlist2))
p19fun <- function(DataPixel) {
if(is.na(DataPixel[1])) {
return(NA)
} else {
t1 <- -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
cld1 <- t1
for (wm in 1:11) {
j <- wm + 1
assign(paste("mnt", j, sep=""), if (get(paste("t", j, sep="")) < get(paste("cld", wm, sep=""))) {j} else {get(paste("mnt", wm, sep=""))})
assign(paste("cld", j, sep=""), if (get(paste("t", j, sep="")) < get(paste("cld", wm, sep=""))) {get(paste("t", j, sep=""))} else {get(paste("cld", wm, sep=""))})
}
cldm <- mnt12
for (wm in 1:12) {
assign(paste("yy", wm, sep=""), if (cldm == wm) {get(paste("q", wm, sep=""))} else {-9999})
}
res <- max(yy1,yy2,yy3,yy4,yy5,yy6,yy7,yy8,yy9,yy10,yy11,yy12)
return(res)
}
}
p19 <- raster(PpTaStack, 0)
filename(p19) <- outfile
pb <- pbCreate(nrow(PpTaStack), type='text', style=3)
for (rw in 1:nrow(PpTaStack)) {
rowVals <- getValues(PpTaStack, rw)
RasVals <- apply(rowVals, 1, p19fun)
p19 <- setValues(p19, RasVals, rw)
p19 <- writeRaster(p19, outfile, format=format, overwrite=TRUE)
pbStep(pb, rw)
}
pbClose(pb)
rm(PpTaStack)
} else {
cat("", "\n", "File bio_19 already exists, skipping calculation, but loading", "\n")
p19 <- raster(outfile)
}
return(p19)
}
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