download_daymet_tile

A numeric indicating the DAYMET tile ID number.

tileID

A character vector of elemets to extract.
The available elements are:
dayl = Duration of the daylight period in seconds per day. This calculation is based on the period of the day during which the sun is above a hypothetical flat horizon.
prcp = Daily total precipitation in millimeters per day, sum of all forms converted to water-equivalent. Precipitation occurrence on any given day may be ascertained.
srad = Incident shortwave radiation flux density in watts per square meter, taken as an average over the daylight period of the day. NOTE: Daily total radiation (MJ/m2/day) can be calculated as follows: ((srad (W/m2) * dayl (s/day)) / l,000,000)
swe = Snow water equivalent in kilograms per square meter. The amount of water contained within the snowpack.
tmax = Daily maximum 2-meter air temperature in degrees Celsius.
tmin = Daily minimum 2-meter air temperature in degrees Celsius.
vp = Water vapor pressure in pascals. Daily average partial pressure of water vapor.

elements

years

A character string indicating where raw downloaded files should be put.
The directory will be created if missing. Defaults to './RAW/DAYMET/'.

raw.dir


Tiles are specified by a tile ID, year, and element;
Tiles are downloaded in the NetCDF format. <code>download_daymet_tile</code> returns the path to the downloaded NetCDF tile files.


internal

Functions to automate downloading geospatial data available from
several federated data sources (mainly sources maintained by the US Federal
government). Currently, the package allows for retrieval of five datasets:
The National Elevation Dataset digital elevation models (1 and 1/3 arc-second;
USGS); The National Hydrography Dataset (USGS); The Soil Survey Geographic
(SSURGO) database from the National Cooperative Soil Survey (NCSS), which is
led by the Natural Resources Conservation Service (NRCS) under the USDA; the
Global Historical Climatology Network (GHCN), coordinated by National Climatic
Data Center at NOAA; the Daymet gridded estimates of daily weather parameters
for North America, version 3, available from the Oak Ridge National Laboratory's
Distributed Active Archive Center (DAAC); and the International Tree Ring Data Bank.
Additional data sources are in the works, global soils (HWSD),
MODIS satellite data products, the National Atlas (US), Natural Earth, and WorldClim.

download_daymet_tile: Download a netcdf tile from the 1-km DAYMET daily weather dataset.

Description

Usage

Arguments

Value