#'@title calcGMIA
#'
#' @description Filling gaps in the Historical area equipped for irrigation from GMIA.
#'
#' @return list of magpie object with data and weight
#' @author Stephen Wirth, Anne Biewald
#' @examples
#'
#' \dontrun{
#' a <- calcOutput("GMIA",aggregate="regglo")
#' }
calcGMIA <- function(){
x <- readSource("GMIA", "all_data_national", convert=TRUE)
small_island_states <- c("ATG","BRB", "COK","NRU", "TUV","NIU", "MDV", "MLT", "GRD",
"VCT","PLW", "LCA", "SGP", "FSM", "BHR", "DMA", "TON",
"KIR", "STP", "SYC")
#small_non_island_states <- c("VAT", "MCO", "SMR", "LIE", "AND")
antarctica_or_arctic <- c("ATA", "ATF", "GRL", "SJM")
#citiestates <- c("HKG", "MAC")
desserts_no_agg <- c("ESH", "GIB")
area <- readSource("FAO", "Land")
sudan <- area[c("SDN","SSD"),1,"6600|Country area.area"]
sudan["SSD",,] <- 64432900
sudan["SDN",,] <- sudan["SDN",,] - as.numeric(sudan["SSD",,])
area_small_island_states <- area[small_island_states,length(getYears(area)),"6600|Country area.area"]
#china <- area[c("CHN", "TWN", "HKG"),length(getYears(area)),"6600|Country area.area"]
x[antarctica_or_arctic,,] <- 0
x[desserts_no_agg,,] <- 0
#x[citiestates,,] <- 0
proportion_sudan <- sudan/as.numeric(as.numeric(sudan["SDN",,])+as.numeric(sudan["SSD",,]))
#proportion_china <- china/as.numeric(as.numeric(china["CHN",,])+as.numeric(china["TWN",,])+as.numeric(china["HKG",,]))
x["SSD",,] <- as.numeric(x["SDN",,])*as.numeric(proportion_sudan["SSD",,])
x["SDN",,] <- as.numeric(x["SDN",,])*as.numeric(proportion_sudan["SDN",,])
#x["TWN",,] <- as.numeric(x["CHN",,])*as.numeric(proportion_china["TWN",,])
#x["CHN",,] <- as.numeric(x["CHN",,])*as.numeric(proportion_china["CHN",,])
#Dissaggregate values for China: Mainland, Hong Kong, Tiwan, and Macao
#Based on AEI shares the information from (http://www.fao.org/nr/water/aquastat/irrigationmap/CHN/index.stm)
x["HKG",,]<- as.numeric(x["CHN",,]) * 0.00003
x["TWN",,]<- as.numeric(x["CHN",,]) * 0.0078
x["CHN",,]<- as.numeric(x["CHN",,]) * 0.992
x["MAC",,]<- 0
value_small_islands <- as.magpie(apply(x[small_island_states,,],MARGIN = c(2,3),FUN = "mean"))
# missingvalues <- c()
# for(j in getRegions(x))
# {
# tmp <- dimSums(x[j,,], dim=c(2,3))
# if(is.na(tmp))
# {
# missingvalues <- append(missingvalues, getRegions(tmp))
# }
# }
# area_missingvalues <- area[missingvalues,length(getYears(area)),"6600|Country area.area"]
#
for(i in getRegions(x))
{
tmp <- dimSums(x[i,,], dim=c(2,3))
if(is.na(tmp))
{
area_tmp <- area[i,length(getYears(area)),"6600|Country area.area"]
if(area_tmp!=0)
{
x[i,,] <- value_small_islands
}
else
{
x[i,,] <- 0
}
}
}
return(list(x=x,
weight=NULL,
unit="ha",
min=0,
description="Area equipped for Irrigation in ha")
)
}
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