weather: Creates weather data file for crop model

In ldemaz/rcropmod: Crop model simulations in R

Description

Creates certain key inputs for crop model weather data files and write them to appropriate format

Usage

weather(
  xy,
  elev,
  srad,
  tmax,
  tmin,
  prec,
  wind = NULL,
  ea = NULL,
  rh = NULL,
  tmu = NULL,
  sh = NULL,
  pres = NULL,
  tdew = NULL,
  sdate,
  edate,
  name,
  outdir,
  model = "DSSAT"
)

Arguments

xy	vector giving longitude then latitude (degrees)
srad	Solar radiation (mj/m^2/day)
tmax	Maximum temperature (deg C)
tmin	Minimum temperature (deg C)
prec	Daily rainfall (mm)
ea	Vapor pressure (mb, optional)
rh	Relative humidity (%, optional)
tmu	Average temperature (deg C, optional)
sh	Specific humidity (kg/kg, optional)
pres	Surface pressure (mb, optional)
tdew	Dewpoint temperature (deg C, optional)
sdate	Start date for range in WTH file
edate	End date for range in WTH file
name	Name prefix for output weather data file
outdir	Output directory for weather file
model	Crop model type, default = "DSSAT"

Details

This is currently only works for the DSSAT model, but is intended to be expanded to other models (e.g. APSIM). Note that this function assumes that daily data given to it will be the same date as UTC. This might be problematic in Australasia.

Value

An output crop model weather file for a single location

Examples

sdate <- "19790701" 
edate <- "20100630"
xy <- c("y" = -16.2783358, "x" = 27.4738917) 
load("data/sp-clim-dat.rda")
elev <- 1120
srad <- swv
name <- "ZASP"
outdir <- "external/ext_data"
weather(xy, elev, srad, tmax, tmin, prec, wind = wind, sh = sh, 
        pres = pres, sdate = sdate, edate = edate, name = name, 
        outdir = outdir)

ldemaz/rcropmod documentation built on Feb. 29, 2020, 10:17 p.m.