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The HDF Group
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 1
Using visualization tools to access HDF data via
OPeNDAP
Joe Lee and Kent YangThe HDF Group
The 13th HDF and HDF-EOS Workshop
November 3-5, 2009
www.hdfgroup.orgNovember 3-5, 2009 HDF/HDF-EOS Workshop XIII 2
HDF-OPeNDAP Tutorial Outline
• Why OPeNDAP?
• OPeNDAP Client Tools
o Visualization and Analysis
• OPeNDAP Servers
• Viewing Data with Panoply
www.hdfgroup.org
Why So Difficult?
• Getting and Listening to MP3 songo Yesterday - Beatles
• Getting and Viewing HDF-EOS dataseto Yesterday’s Ozone - OMI
HDF/HDF-EOS Workshop XIII 3November 3-5, 2009
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Mirador – Data Access Made Simple
HDF/HDF-EOS Workshop XIII 4November 3-5, 2009
www.hdfgroup.org
Access HDF via FTP/HTTP
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 5
Users
FTP / HTTP Clients
Tool (IDL)
FTP / HTTPServers
HDF Files
OMI
FTP
Local HDF Files
Aura
All I want is a dataset, not the entire file.
All I want is x-region data but data is missing.
www.hdfgroup.orgNovember 3-5, 2009 HDF/HDF-EOS Workshop XIII 6
Why OPeNDAP?
• MP3 over CD• Pick one song, not album (Quick)• Listen now and Buy later (Right)
• OPeNDAP over FTP/HTTP• Pick one dataset, not file (Quick)• View now and Download later (Right)
• Benefit: Save Time and Resource!
Why MP3?
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Remote Data(HDF4/5)
File Transfer Protocol (FTP) via Internet
FTPServer
FTP Client
Local Data(HDF4/5)
Data Access Protocol (DAP) via Internet
OPeNDAPServer
View Data (User)
OPeNDAP Concept
7
OPeNDAP client Visualization
Tools
Typical Remote Access
Visualization tools
(e.g. grads)
November 3-5, 2009 HDF/HDF-EOS Workshop XIII
www.hdfgroup.org
Access HDF via FTP/HTTP
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 8
Users
FTP / HTTP Clients
HDF Tool
FTP / HTTPServers
HDF Files
OMI
FTP/HTTP
Local HDF Files
Aura
www.hdfgroup.org
Access HDF via OPeNDAP
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 9
Users
OPeNDAP Servers
HDF Files
OMIDAP
OPeNDAPClient Tool
Aura
www.hdfgroup.org
OPeNDAP – Why Not?
HDF/HDF-EOS Workshop XIII 10November 3-5, 2009
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How to Enjoy MP3
MP3
1. Install MP3 player
2. Search web for MP3
3. Listen to your MP3
HDF via OPeNDAP
1. Install OPeNDAP tool
2. Search web for data
3. View data
HDF/HDF-EOS Workshop XIII 11
How to Enjoy HDF via OPeNDAP
November 3-5, 2009
www.hdfgroup.org
OPeNDAP Tools
HDF/HDF-EOS Workshop XIII 12
1. Panoply2. GrADS3. IDV4. IDL5. NCL6. ODC7. Ferret8. ncBrowse
http://www.giss.nasa.gov/tools/panoply/http://www.iges.org/grads/
http://www.unidata.ucar.edu/software/idv/http://www.ittvis.com/ProductServices/IDL.aspxhttp://www.ncl.ucar.edu/http://opendap.org/ODC/
http://ferret.wrc.noaa.gov/Ferret/http://www.epic.noaa.gov/java/ncBrowse/November 3-5, 2009
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Install Panoply
• http://www.giss.nasa.gov/tools/panoply/
• Java 5 Runtime Environment
HDF/HDF-EOS Workshop XIII 13November 3-5, 2009
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Search Web for Data
• Open Web Browser
• Search omi opendap (or Enter URL)
• http://acdisc.gsfc.nasa.gov/opendap/ (http://www.hdfgroup.org/projects/opendap4/opendap4_demo.html)
• (Click HDF-EOS5)
• (Click Aura OMI Level 3)
• Click OMTO3d.003
HDF/HDF-EOS Workshop XIII 14November 3-5, 2009
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Search Web for OPeNDAP Data
• Pick the Date
• Select & Copy the DATA URL (Ctrl-C)
HDF/HDF-EOS Workshop XIII 15November 3-5, 2009
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View Data
• Start Application
• Enter URL (Album)
• Pick Dataset (Track)
• Set Projection (Equalizer)
• Enter Lat / Lon (FF/REW)
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Examples and Demo Pages
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The HDF Group
Thank You!
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 18
• More Tools Examples:http://hdfeos.org/software/idv.phphttp://hdfeos.org/examples/using_grads.php
• More Demo Servers and Data:http://hdfgroup.org/projects/opendaphttp://hdfgroup.org/projects/opendap4
www.hdfgroup.org
Acknowledgements
This work was supported by cooperative agreement number NNX06AC83A, NNX08AO77A and
NNX06AG75A from the National Aeronautics and Space Administration (NASA).
Any opinions, findings, conclusions, or recommendations expressed in this material are
those of the author[s] and do not necessarily reflect the views of the National Aeronautics and Space
Administration.
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 19
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The HDF Group
Questions/comments?
HDF-EOS to MP3?
Earth Music??
November 3-5, 2009 HDF/HDF-EOS Workshop XIII 20
