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Accessing HDF Data via OPeNDAP: Visualization Tools Tutorial

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susanhenderson
20 diapositives · 245 Views · Jan 04, 2020

Learn how to use OPeNDAP to access HDF data and explore visualization tools for data analysis. Dive into OPeNDAP concepts and discover remote data access methods through Panoply and other tools. Get hands-on experience with accessing HDF data via FTP/HTTP.

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  1. 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 HDF/HDF-EOS Workshop XIII

  2. HDF-OPeNDAP Tutorial Outline • Why OPeNDAP? • OPeNDAP Client Tools • Visualization and Analysis • OPeNDAP Servers • Viewing Data with Panoply HDF/HDF-EOS Workshop XIII

  3. Why So Difficult? • Getting and Listening to MP3 song • Yesterday - Beatles • Getting and Viewing HDF-EOS dataset • Yesterday’s Ozone - OMI HDF/HDF-EOS Workshop XIII

  4. Mirador – Data Access Made Simple HDF/HDF-EOS Workshop XIII

  5. Access HDF via FTP/HTTP All I want is x-region data but data is missing. Aura Users All I want is adataset, not the entire file. Tool (IDL) OMI FTP FTP / HTTP Clients FTP / HTTP Servers HDF Files Local HDF Files HDF/HDF-EOS Workshop XIII

  6. Why MP3? 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! HDF/HDF-EOS Workshop XIII

  7. OPeNDAP Concept Typical Remote Access View Data (User) OPeNDAP client Visualization Tools Visualization tools (e.g. grads) Remote Data (HDF4/5) Local Data (HDF4/5) FTP Server OPeNDAP Server FTP Client File Transfer Protocol (FTP) via Internet Data Access Protocol (DAP) via Internet HDF/HDF-EOS Workshop XIII

  8. Access HDF via FTP/HTTP Aura Users HDF Tool OMI FTP/HTTP FTP / HTTP Clients FTP / HTTP Servers HDF Files Local HDF Files HDF/HDF-EOS Workshop XIII

  9. Access HDF via OPeNDAP Aura Users OMI DAP OPeNDAP Client Tool OPeNDAP Servers HDF Files HDF/HDF-EOS Workshop XIII

  10. OPeNDAP – Why Not? HDF/HDF-EOS Workshop XIII

  11. How to Enjoy HDF via OPeNDAP How to Enjoy MP3 MP3 HDF via OPeNDAP Install OPeNDAP tool Search web for data View data • Install MP3 player • Search web for MP3 • Listen to your MP3 HDF/HDF-EOS Workshop XIII

  12. OPeNDAP Tools Panoply GrADS IDV IDL NCL ODC Ferret 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/ HDF/HDF-EOS Workshop XIII

  13. Install Panoply • http://www.giss.nasa.gov/tools/panoply/ • Java 5 Runtime Environment HDF/HDF-EOS Workshop XIII

  14. 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

  15. Search Web for OPeNDAP Data • Pick the Date • Select & Copy the DATA URL (Ctrl-C) HDF/HDF-EOS Workshop XIII

  16. View Data • Start Application • Enter URL (Album) • Pick Dataset (Track) • Set Projection (Equalizer) • Enter Lat / Lon (FF/REW) HDF/HDF-EOS Workshop XIII

  17. Examples and Demo Pages HDF/HDF-EOS Workshop XIII

  18. Thank You! • 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 HDF/HDF-EOS Workshop XIII

  19. 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. HDF/HDF-EOS Workshop XIII

  20. Questions/comments? HDF-EOS to MP3? Earth Music?? HDF/HDF-EOS Workshop XIII