The SPECS-EUPORIAS Data Portal is based on a password-protected THREDDS data server providing metadata and data access to a set of geo-referenced atmospheric variables using OPeNDAP and other remote data access protocols. Therefore, before accessing the data, authentication is required at the SPECS-EUPORIAS Data Portal.
Within a R session, this step can be easily accomplished assuming that we already have a valid username and password. To this aim, in the following lines we illustrate how to proceed using the R-to-Java interface provided by the package rJava (For more information on the authentication procedure click on ?the help page).
> username <- "myUsername" # This is a character string with the username > password <- "myPassword" # This is a character string with the password > aux <- .jnew("ucar/nc2/util/net/HTTPBasicProvider", username, password) > J("ucar.nc2.util.net.HTTPSession")$setGlobalCredentialsProvider(aux)
In case the connection is performed via a proxy, it is necessary to set up the proxy prior to the authentication step, in order to connect to the server.
> proxyHost <- "proxy.host.com" # Your institution Proxy configuration: host > proxyPort <- as.integer(1234) # and port > J("ucar.nc2.util.net.HTTPSession")$setGlobalProxy(proxyHost,proxyPort)
Note that the object proxyHost is a character string, whereas the proxyPort must be an integer.