[R-sig-Geo] modis download authentication

[Luca Candeloro]

I used succesfully the function getBinaryURL from RCurl library to download
.hdf file, as in:

content <- getBinaryURL("
http://e4ftl01.cr.usgs.gov/MOLT/MOD11A2.005/2016.01.01/MOD11A2.A2016001.h18v04.005.2016012041335.hdf
")

Since http://e4ftl01.cr.usgs.gov/ has recently applied a login and pass
authentication to retrieve data, the previous code doesn't work.
It seems (from
https://lpdaac.usgs.gov/sites/default/files/public/get_data/docs/Command%20Line%20Access%20Tips%20for%20Utilizing%20Earthdata%20Login.docx
)
that curl options should be necessarily  set.
Does someone know how to correctly specify RCurl options in R, so that
getBinaryURL works again?
thanks,
Luca

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