#' @title TimberDemandVolumetric
#' @description reads timber demand out of a MAgPIE gdx file
#'
#' @export
#'
#' @param gdx GDX file
#' @param file a file name the output should be written to using write.magpie
#' @param level Level of regional aggregation; "cell", "reg" (regional), "glo" (global), "regglo" (regional and global) or any secdforest aggregation level defined in superAggregate
#' @details Forest demandfor timber production
#' @return Forest demandfor timber production
#' @author Abhijeet Mishra
#' @importFrom magclass clean_magpie dimSums collapseNames setYears write.magpie setCells
#' @importFrom luscale superAggregate
#' @examples
#'
#' \dontrun{
#' x <- TimberDemandVolumetric(gdx)
#' }
TimberDemandVolumetric <- function(gdx, file=NULL, level="regglo"){
a <- NULL
kforestry <- readGDX(gdx,"kforestry")
if (level %in% c("reg","regglo")){
ov_supply <- readGDX(gdx, "ov_supply", select=list(type="level"))[,,kforestry]
ov_supply[,,"wood"] <- ov_supply[,,"wood"] / 0.6
ov_supply[,,"woodfuel"] <- ov_supply[,,"woodfuel"] / 0.3
if("constr_wood" %in% getNames(ov_supply)) ov_supply[,,"constr_wood"] <- ov_supply[,,"constr_wood"] / 0.6
ov_supply <- superAggregate(data = ov_supply,aggr_type = "sum",level = level)
a <- ov_supply
} else if (level == "cell"){
stop("Resolution not recognized. Select regglo as level. NULL returned.")
}
out(a,file)
}
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