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Accessing HDF5 Data via OPeNDAP

MuQun Yang, Hyo -Kyung Lee, Mike Folk 1 , James Gallagher 2 1 The HDF Group, 2 OPeNDAP, Inc. Testing HDF5-OPeNDAP handler with OPeNDAP Client Tools. Testing HDF5-Friendly OPeNDAP Client Library Prototype with GrADS. HDF5 Solution. IDV. IDL. File format. Efficiency.

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Accessing HDF5 Data via OPeNDAP

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  1. MuQun Yang, Hyo-Kyung Lee, Mike Folk1,James Gallagher 2 1The HDF Group, 2OPeNDAP, Inc. Testing HDF5-OPeNDAP handler with OPeNDAPClient Tools Testing HDF5-Friendly OPeNDAP Client Library Prototype with GrADS HDF5 Solution IDV IDL File format Efficiency Commondatamodel StandardAPIs I/O software Access HDF5 Data via OPeNDAP HDF5 handler HDF5 DAP Client Tools DAP Client Libraries DAP HDF5-Friendly OPeNDAP Client Library Prototype Aura OMI Level 3 Grid • Similar to NetCDFOPeNDAP client library • Access DAP objects without following the CF conventions • Access HDF-EOS5 swath and grid objects • Access HDF5 groups • Access HDF5 datasets with object/regional reference types Accessing HDF5 Data via OPeNDAP Major Sponsors • Manage large, complex scientific data sets • Access data easily and quickly • Organize data for efficient storage • Flexible data model • Support data compression, encryption, error • detection, user-definable filters • MPI I/O support for parallel environments http://www.hdfgroup.org help@hdfgroup.org View HDF-EOS5 Swath View HDF-EOS5 Grid HDF-EOS5 Grid HDF-EOS5 Swath HDF5 HDF5 GrADS with HDF5-Friendly OPeNDAP Client Library Prototype OPeNDAP Client Tools (e.g. GrADS / Ferret / IDV) HDF5-OPeNDAP handler HDF5-OPeNDAP handler OPeNDAP Client Library (e.g. libnc_dap) HDF5-Friendly OPeNDAP Client Library Prototype OPeNDAP server (e.g. CGI / Hyrax ) OPeNDAP server (e.g. CGI / Hyrax ) OPeNDAP Library(libdap) OPeNDAP Library(libdap) OMI Grid Data MLS Swath Data Matlab lower stratosphere COat these elevations is a measure of pollution upper stratosphere The image above shows the vertical profile of CO over Beijing for three different dates in 2008. The CO amounts between 200 hPa (lower stratosphere) and 315 hPa (upper troposphere) are measures of pollution. The plot clearly shows the CO levels measured by the Aura MLS instrument declined over the period examined, indicating improved air quality during the Beijing 2008 Olympic Games. Acknowledgments: We thank Dr. Peter Leonard, Marghi Hopkins and Daniel Kahn at SSAI to provide not publicly available Aura L3G EOS data shown in the demo. We also thank Abe Taaheri at Raytheon; Denis Nadeau, James E. Johnson and Christopher Lynnes at NASA GES DISC to provide valuable suggestions on designing and implementing HDF5 OPeNDAP handler. We also thank Dan J. Marinelli, Frank Lindsay and Kathy Fontaine for their support and guidance in making this study possible. This report was based upon work supported in part by NASA ACCESS project under NASA grant NNX06AG75A and by the Cooperative Agreement with the National Aeronautics and Space Administration (NASA) under NASA grant NNG05GC60A and NASA grant NNX06AC83A.  Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of NASA. 

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