targets: Calculates crop production targets

In PrincetonUniversity/agroEcoTradeoff: Landuse Tradeoff analysis model

Description

This module calculates the amount of production (in tonnes) for each modelled crop, given user-specified targets, how much of it can be met on existing cropland, and how much needs to come from new cropland. This version works with dta.tables.

Usage

targets(prod_targ, currprod, currprodmod)

Arguments

prod_targ	A named list given the production targets for each crop as a multiple (greater than 1)
currprod	A data.table of the current production coming from existing croplands
currprodmod	A vector to modify production levels on existing cropland.

Details

This determines how much cropland has to be converted. The argument currprodmod can be used to simulate an assumption that yield gaps on current cropland will be closed before new land is needed (or that a greater amount of new land will be needed if current production falls, if currprodmod < 1).

Examples

il <- fetch_inputs(input_key = "ZA")  # fetch all necessary inputs
currprodmod <- 1
currprod <- il$currprod
prod_targ <- c("maize" = 2, "soy" = 2)
targets(prod_targ, currprod, currprodmod)
currprodmod <- c(1.2, 0.9)
targets(prod_targ, currprod, currprodmod)
currprodmod <- c(1.2, 0.9, 0.8)
targets(prod_targ, currprod, currprodmod)  # fails
currprodmod <- NULL
targets(prod_targ, currprod, currprodmod)  # fails
currprodmod <- c(1, 1)
targets(prod_targ, currprod, currprodmod)  # fails
currprodmod <- c(2, 2)
targets(prod_targ, currprod, currprodmod)  # fails
currprodmod <- c(0.5, 0.5)
targets(prod_targ, currprod, currprodmod)

PrincetonUniversity/agroEcoTradeoff documentation built on May 8, 2019, 3:12 p.m.