[R-sig-Geo] modis download authentication

[Thiago V. dos Santos]

This is what worked for me, on a Mac:

myopts <- RCurl::curlOptions(netrc=TRUE, netrc.file=path.expand("~/.netrc"),
                             cookiefile=path.expand("~/.urs_cookies"),
                             followlocation=TRUE)


getBinaryURL(your_url, .opts=myopts)

where the .netrc file should look like this:

machine urs.earthdata.nasa.gov login your_login password your_pass
machine e4ftl01.cr.usgs.gov login your_login password your_pass

(note that both lines are required, and your_login and your_pass are your credentials to the EarthData system)

and the .urs_cookies is just an empty file where the access information will be saved to.

You can use a simple command that explicitly requires your credentials, but I don't think revealing your credentials on a R script is a good idea.

There are some helpful tips here as well:
http://disc.sci.gsfc.nasa.gov/registration/registration-for-data-access
 Greetings,
 -- Thiago V. dos Santos

PhD student
Land and Atmospheric Science
University of Minnesota



On Thursday, September 8, 2016 6:19 AM, Luca Candeloro <luca.candeloro at gmail.com> wrote:
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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