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GES Distributed Active Archive Center
DAAC Search and Order Help
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How do I access the data, and are there any tips?
For help in navigating or searching in data in the data pool, a
Web interface is provided at:
http://daac.gsfc.nasa.gov/data/datapool/
Anonymous ftp:
You can either use a command-line ftp session or a ftp client
like WS_FTP to get data from the Data Pool.
The one you use, however, may require you to specify that you
wish to use the "passive-mode". For example, on SGI and Linux
machines, the -p option must be used with FTP for get or mget to
work properly:
ftp -p g0dps01u.ecs.nasa.gov.
Note: The "-p" option ensures the so-called passive-mode session.
DO NOT USE the -p option with Sun machines or any Windows or Mac
ftp clients.
ftp g0dps01u.ecs.nasa.gov
For downloading many files, command-line FTP is more efficient
than
using a Web browser. This option is available on most machines,
even
Windows NT and Windows 2000.
Using Command Line FTP:
(1) The "mget" command lets you download all files in a given
directory. It can be even easier if you set the interactive
prompt
off. For example:
ftp> cd MODB/RMT03.001/2003.02.27
250 CWD command successful.
ftp>prompt off
Interactive mode Off .
ftp>mget *
This will download all files in the directory without prompting
for each one.
(2) On SGI and Linux machines, the -p option must be used with
FTP for mget to work
properly, i.e.:
ftp -p g0dps01u.ecs.nasa.gov.
(3) How to FTP files with an FTP
script: If you have a list of specific files you want to get,
i.e., more
specific than "mget *", you can put them into an FTP script. Here
is an
example that have to be in a simple text file:
user anonymous somebody@somewhere.net
cd MOGT/MOD02SSH.004/2003.02.25
get MOD02SSH.A2003056.0000.004.2003056102250.hdf
get MOD02SSH.A2003056.0000.004.2003056102250.hdf.xml
get MOD02SSH.A2003056.0005.004.2003056102450.hdf
get MOD02SSH.A2003056.0005.004.2003056102450.hdf.xml
bye
On an SGI or Linux machine, we would run this with:
ftp -p -n g0dps01u.ecs.nasa.gov < script
where script is that text file.
Please do not use the -p switch in DOS, SunOS or Windows/Mac
platforms :
ftp -n g0dps01u.ecs.nasa.gov < script
The Goddard DAAC Search and Order (WHOM), provides an option
where the list of granules (your search results) can
be saved in a similar, ready-to-use, script file.
All you have to do is to pipe that script file
into your ftp session as shown above.
To list files and directories, use "ls -l" instead of just "ls"
that shows the text file only.
Download files as usual using FTP download. See notes at the end
of this Readme on some issues
related to Netscape.
More information on how to FTP data from the GES DAAC and some
links to download FTP software is available:
http://daac.gsfc.nasa.gov/
MODIS/FAQ/A_ftp_pickup.shtml
-- Using FTP for MODIS data pickup
http://d
aac.gsfc.nasa.gov/MODIS/FAQ/A_ftp_pickup.shtml#passive_ftp_table
-- A quick reference table for FTP
(4) "On-the-fly" compression option:
The FTP server on the Data Pool provides a very useful option to
compress files to be downloaded
"on-the-fly". This will reduce download time and download volume
significantly.
Depending on the method users employ to access the Data Pool,
here are the instructions:
For command-line ftp session (Unix, :DOS, etc.), to get
gz-compression, do the following (add
extension gz to the filename):
ftp > get MOD08_D3.A2002182.003.2002194102813.hdf.gz
For Unix compression, add extension ".Z":
ftp > get MOD08_D3.A2002182.003.2002194102813.hdf.Z
For Internet Explorer or Netscape, you should type in a complete
filename with extra extension.
In Internet Explorer, if you start typing first letters after
"/", in the pull-down menu, all the
filenames become visible. So instead of typing in, you can just
select filename from that menu,
and then add ".gz" or ".Z".
Privacy, Security, Notices
Responsible NASA Official: Steve Kempler, DAAC Manager -- Steven.J.Kempler@nasa.gov
GES DAAC Help Desk: 301-614-5224 or 1-877-422-1222 -- help@daac.gsfc.nasa.gov
Webmaster: Peggy Eaton -- web-curator@daac.gsfc.nasa.gov
Last updated: %{d:YYYY-MM-DD HH;MI;SS}
