EarthdataLogin: Create File with Earthdata Login Credentials
Description
Create a hidden .netrc file with Earthdata Login credentials in your home
directory. The information included therein is used to login to
https://urs.earthdata.nasa.gov/ which is a mandatory requirement in order
to download MODIS data from LP DAAC, LAADS and NSIDC (see also
MODISoptions()). If the .netrc file already exist, the function can be
used to re-enter credentials.