1. GES DISC DAAC February 28, 2002HDF-EOS Workshop V1 The Goddard DAAC The Goddard DAAC http://daac.gsfc.nasa.gov http://daac.gsfc.nasa.gov Presented by: James Johnson, SSAI HDF and HDF- EOS Experiences and Applications

2. GES DISC DAAC February 28, 2002HDF-EOS Workshop V2 Science Disciplines Hydrology Rainfall Climatology Rainfall Climatology TRMM TRMM Field Experiments Aqua AIRS Hurricane Mitch as seen by TRMM Global Biosphere Ocean Color CZCS CZCS OCTS OCTS SeaWiFS Terra MODIS Aqua MODIS Land Biosphere AVHRR Pathfinder Monthly Ocean Chlorophyll and NVDI from SeaWiFS Upper Atmosphere Heritage BUV/SBUV Heritage BUV/SBUV Heritage LIMS Heritage LIMS Heritage TOMS Heritage TOMS UARS UARS EP TOMS Aura HIRDLS Aura MLS Aura OMI SORCE 1999 Antarctic Ozone Hole as seen by TOMS Atmospheric Dynamics TOVS Pathfinder TOVS Pathfinder Data Assimilation Terra MODIS Aqua AIRS Aqua MODIS TOVS 1000 hPa Monthly Mean Specific Humidity Black- completed Red - active Green - future

3. GES DISC DAAC February 28, 2002HDF-EOS Workshop V3 Primary Data Sets

4. GES DISC DAAC February 28, 2002HDF-EOS Workshop V4 HDF & HDF-EOS Applications n Universal Data Reduction Server (UDRS) u Distributed Oceanographic Data System (DODS) u Web Mapping Testbed (WMT-DODS)/OpenGIS u Live Access Server (LAS)/Ferret u Gridded Analysis and Display System (GrADS-DODS) n Online data Analysis (OASIS) n read_hdf generic reader n other data set specific read software, including MODIS

5. GES DISC DAAC February 28, 2002HDF-EOS Workshop V5 Universal Data Reduction Server n A virtual server consisting of: u DODS server u WMT-DODS server u GrADS-DODS server u LAS/Ferret u (others can be added) n Allows a variety of discipline, interdisciplinary and applications users to access DAAC data

6. GES DISC DAAC February 28, 2002HDF-EOS Workshop V6 Distributed Oceanographic Data Server n DODS developed by URI and UCAR n a protocol for requesting and transporting data across the web n Transparently supports multiple formats n Subsetting performed at server end n Supports various servers (netCDF, HDF, GrADS, MatLAB, FreeForm,…) n Supports various clients (IDL, MatLAB, Ferret, LAS, GrADS, …) n Various DAAC data sets served by DODS (see http://daac.gsfc.nasa.gov/DAAC_DOCS/DODS.html)http://daac.gsfc.nasa.gov/DAAC_DOCS/DODS.html

7. GES DISC DAAC February 28, 2002HDF-EOS Workshop V7 Web Mapping Testbed WMT-DODS Server n OpenGIS consortium n Import HDF & HDF-EOS data into GIS packages n Supports geolocated images n Interface to many DODS servers u DAAC u external (see http://daac.gsfc.nasa.gov/daac-bin/viewer/viewer.cgi)http://daac.gsfc.nasa.gov/daac-bin/viewer/viewer.cgi

8. GES DISC DAAC February 28, 2002HDF-EOS Workshop V8 GrADS-DODS Server n Developed by Center for Ocean-Land-Atmosphere Studies (COLA) n Supports data analysis functions (statistical, smoothing, correlation, …) n Subset data n Work on single or multiple files n Supports several data formats (HDF, netCDF, GRIB, binary, …) n Interfaces with DODS n DAAC Server to go operational later this year

9. GES DISC DAAC February 28, 2002HDF-EOS Workshop V9 Live Access Server/ Ferret n LAS developed by NOAA n Web GUI interface (Ferret) n Interfaces with DODS n Visualize data n Subset data n Save to various formats n Custom data set specific templates added by DAAC n Support for MODIS and SeaWiFS (coming soon)

10. GES DISC DAAC February 28, 2002HDF-EOS Workshop V10 Atmospheric Dynamics OASIS n Web Interface n Uses JAVA applets n Perform data analysis online n Intercomparison n Visualize data n Animations n Supports DAAC atmospheric dynamics data n HDF & HDF-EOS support coming soon (see http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/atmospheric_dynamics/online_analysis/OASIS/html/) http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/atmospheric_dynamics/online_analysis/OASIS/html/

11. GES DISC DAAC February 28, 2002HDF-EOS Workshop V11read_hdf n Interactive command line C program n Generic, supports any HDF file n Display hierarchical tree of useful objects (SDS, Vdata, Vgroup, Raster Images, Annotations) n Subset data n Output to ASCII or binary n Also dump any obscure HDF object (DFTAG_NT, DFTAG_VERSION, etc.)

12. GES DISC DAAC February 28, 2002HDF-EOS Workshop V12 Other DAAC HDF Applications n MODIS readers and visualization (IDL based) (see http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/MODIS/)http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/MODIS/ u geoview u modis_atmos u simap u HDFLook-MODIS (collaboration between DAAC and the Laboratoire d’Optique Atmosphérique, France) n SeaWiFS data best used with SeaWiFS’ SeaDAS package n TRMM data reader and IDL based TSDIS orbit viewer n Other DAAC data sets include C, Fortran and/or IDL readers

13. GES DISC DAAC February 28, 2002HDF-EOS Workshop V13 HDF & HDF-EOS Issues n Large file sizes (MODIS, AVHRR) u requires lots of bandwidth for downloading u end user needs lots of disk space u non-standard Grid projections n User frustration u reluctance to accept HDF (prefer ASCII, binary, other formats) u download and install libraries (two for HDF-EOS) u confusion - HDF, HDF-EOS, and now HDF5 n Poor HDF layout/implementation (or not self documenting) u cryptic field and file names u no field level attributes or descriptions of file contents u too many fields u internal compression rarely utilized