Retrieve McClear clear sky solar radiation data

Usage

cams_get_mcclear(lat, lng, date_begin, date_end, time_step = "PT01H",
  alt = -999, verbose = FALSE)

lat: Latitude, in decimal degrees. Required
lng: Longitude, in decimal degrees. Required
date_begin: Start date as 'yyyy-mm-dd' string. Required
date_end: End date as 'yyyy-mm-dd' string. Required
time_step: Aggregation: 'PT01M' for minutes, 'PT15M' for 15 minutes, 'PT01H' for hourly, 'P01D' for daily, 'P01M' for monthly. Deafult 'PT01H'
alt: Altitude in meters, use -999 to let CAMS decide. Default -99
verbose: TRUE for verbose output. Default "FALSE"

A data frame with requested solar data

if (FALSE) { # \dontrun{
df <- cams_get_mcclear(
  lat=60, lng=15, date_begin="2016-01-01", date_end="2016-01-15")
print(head(df))
} # }