get_daymet2_apsim_met: Get DAYMET data for an APSIM met file

In apsimx: Inspect, Read, Edit and Run 'APSIM' "Next Generation" and 'APSIM' Classic

Get DAYMET data for an APSIM met file

Description

Uses download_daymet from the daymetr package to download data to create an APSIM met file.

Usage

get_daymet2_apsim_met(lonlat, years, wrt.dir = ".", filename, silent = FALSE)

Arguments

lonlat	Longitude and latitude vector
years	a numeric vector of years to extract (c(start, end)). For example, f you need 2012 through 2015, use c(2012, 2015).
wrt.dir	write directory (default is the current directory)
filename	file name for writing out to disk
silent	argument passed to download_daymet

Details

This function requires the daymetr package. This function should replace the get_daymet_apsim_met function.

If the filename is not provided it will not write the file to disk, but it will return an object of class ‘met’. This is useful in case manipulation is required before writing to disk. The variable ‘srad’ as downloaded from daymet is average solar radiation, so it is converted to total. Daily total radiation (MJ/m2/day) can be calculated as follows: ((srad (W/m2) * dayl (s/day)) / 1,000,000)
Vapor Pressure Deficit (vp) should be in hecto Pascals

Value

It returns an object of class ‘met’ and writes a file to disk when filename is supplied.

Source

The data is retrieved using the daymetr package. For the original source see: https://daymet.ornl.gov/

Examples

## Not run: 
require(daymetr)
## I write to a temp directory but replace as needed
dmet12 <- get_daymet2_apsim_met(lonlat = c(-93,42), years = 2012)
summary(dmet12)
## Check for reasonable ranges 
check_apsim_met(dmet12)

## End(Not run)

apsimx documentation built on Sept. 11, 2024, 5:42 p.m.