Using%20visualization%20tools%20to%20access%20HDF%20data%20via%20OPeNDAP

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Using visualization tools to access HDF data via
OPeNDAP
Joe Lee and Kent Yang The HDF Group The
13th HDF and HDF-EOS Workshop November 3-5, 2009
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HDF-OPeNDAP Tutorial Outline

• Why OPeNDAP?
• OPeNDAP Client Tools
• Visualization and Analysis
• OPeNDAP Servers
• Viewing Data with Panoply

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Why So Difficult?

• Getting and Listening to MP3 song
• Yesterday - Beatles
• Getting and Viewing HDF-EOS dataset
• Yesterdays Ozone - OMI

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Mirador Data Access Made Simple
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Access HDF via FTP/HTTP
All I want is x-region data but data is missing.
Aura
Users
All I want is a dataset, not the entire file.
Tool (IDL)
OMI
FTP
FTP / HTTP Clients
FTP / HTTP Servers
HDF Files
Local HDF Files
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Why OPeNDAP?
Why MP3?

• 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!

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OPeNDAP Concept
Typical Remote Access
Remote Data (HDF4/5)
View Data (User)
OPeNDAP client Visualization Tools
Visualization tools (e.g. grads)
FTP Server
Local Data (HDF4/5)
OPeNDAP Server
FTP Client
File Transfer Protocol (FTP) via Internet
Data Access Protocol (DAP) via Internet
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Access HDF via FTP/HTTP
Aura
Users
HDF Tool
OMI
FTP/HTTP
FTP / HTTP Clients
FTP / HTTP Servers
HDF Files
Local HDF Files
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Access HDF via OPeNDAP
Aura
Users
OMI
DAP
OPeNDAP Servers
HDF Files
OPeNDAP Client Tool
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OPeNDAP Why Not?
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How to Enjoy MP3
How to Enjoy HDF via OPeNDAP

• MP3

• HDF via OPeNDAP

1. Install MP3 player
2. Search web for MP3
3. Listen to your MP3

• Install OPeNDAP tool
• Search web for data
• View data

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OPeNDAP Tools

1. Panoply
2. GrADS
3. IDV
4. IDL
5. NCL
6. ODC
7. Ferret
8. 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.aspx
http//www.ncl.ucar.edu/
http//opendap.org/ODC/
http//ferret.wrc.noaa.gov/Ferret/
http//www.epic.noaa.gov/java/ncBrowse/
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Install Panoply

• http//www.giss.nasa.gov/tools/panoply/
• Java 5 Runtime Environment

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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/o
  pendap4_demo.html)
• (Click HDF-EOS5)
• (Click Aura OMI Level 3)
• Click OMTO3d.003

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Search Web for OPeNDAP Data

• Pick the Date
• Select Copy the DATA URL (Ctrl-C)

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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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Thank You!

• More Tools Exampleshttp//hdfeos.org/software/i
  dv.phphttp//hdfeos.org/examples/using_grads.php
  
• More Demo Servers and Datahttp//hdfgroup.org/p
  rojects/opendaphttp//hdfgroup.org/projects/opend
  ap4

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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 authors and do not necessarily
  reflect the views of the National Aeronautics and
  Space Administration.

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Questions/comments?

• HDF-EOS to MP3?
• Earth Music??