wf_request {ecmwfr}

R Documentation

ECMWF data request and download

Description

Stage a data request, and optionally download the data to disk. Alternatively you can only stage requests, logging the request URLs to submit download queries later on using wf_transfer. Note that the function will do some basic checks on the request input to identify possible problems.

Usage

wf_request(
  request,
  user,
  transfer = TRUE,
  path = tempdir(),
  time_out = 3600,
  job_name,
  verbose = TRUE
)

wf_request_batch(
  request_list,
  workers = 2,
  user,
  path = tempdir(),
  time_out = 3600,
  total_timeout = length(request_list) * time_out/workers
)

Arguments

request	nested list with query parameters following the layout as specified on the ECMWF APIs page
user	user (email address) used to sign up for the ECMWF data service, used to retrieve the token set by wf_set_key
transfer	logical, download data TRUE or FALSE (default = TRUE)
path	path were to store the downloaded data
time_out	how long to wait on a download to start (default = 3*3600 seconds).
job_name	optional name to use as an RStudio job and as output variable name. It has to be a syntactically valid name.
verbose	show feedback on processing
request_list	a list of requests that will be processed in parallel.
workers	maximum number of simultaneous request that will be submitted to the service. Most ECMWF services are limited to 20 concurrent requests (default = 2).
total_timeout	overall timeout limit for all the requests in seconds.

Value

the path of the downloaded (requested file) or the an R6 object with download/transfer information

Author(s)

Koen Hufkens

See Also

wf_set_key wf_transfer

Examples

## Not run: 
# set key
wf_set_key(user = "test@mail.com", key = "123")

request <- list(stream = "oper",
   levtype = "sfc",
   param = "167.128",
   dataset = "interim",
   step = "0",
   grid = "0.75/0.75",
   time = "00",
   date = "2014-07-01/to/2014-07-02",
   type = "an",
   class = "ei",
   area = "50/10/51/11",
   format = "netcdf",
   target = "tmp.nc")

# demo query
wf_request(request = request, user = "test@mail.com")

# Run as an RStudio Job. When finished, will create a
# variable named "test" in your environment with the path to
# the downloaded file.
wf_request(request = request, user = "test@mail.com", job_name = "test")

## End(Not run)

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