Published on February 17, 2014
Guangyu Zhao Prof. Larry Di Girolamo Department of Atmospheric Sciences University of Illinois at Urbana-Champaign
Experience with HDF/HDF-EOS data 1. HDF-EOS Datasets MODIS MISR ASTER CALIPSO
Experience with HDF/HDF-EOS data 1. HDF-EOS Datasets MODIS Level-1 data One orbit of MISR level-1 radiance product ~= 600 (Mb) x 1 + 200 (Mb) x 8 ~= 2.2 Gb Level-2 data ASTER One orbit of MISR level-2 cloud and aerosol products ~= 1 Gb Level-3 data (only monthly) 11-year ~= 100 Gb As of today, over 56300 orbits of data have been collected. In total ~= 200 Tb
Experience with HDF/HDF-EOS data 2. HDF data processing and visualization •Format Conversion •HDF ↔ Binary •HDF → Netcdf ASTER •Re-projection •Data fusion •Visualization •Image display and manipulation •Stereoscopic display
Passive Stereo Wall
Hurricane Alberto, August 11, 2000
Experience with HDF/HDF-EOS data 3. Computer languages •C/C++, Fortran (…<-shell scripts), Python •Matlab ASTER 4. Computer support from JPL •HDFscan, MISR toolbox…
Example : winter global map of cloud cover producing Data ordering from DAAC 3 month Level-1B data [2.5 Tb] Applying cloud mask algorithm Leve-2 cloud mask product [75 Gb] Level-3 cloud cover [20 Mb]
Example : winter global map of cloud cover validating MISR MODIS Data ordering from DAAC 3 month Level-1B data [2.5 Tb] Applying cloud mask algorithm Leve-2 cloud mask product [75 Gb] Level-3 cloud cover [20 Mb]
Application of HDF/HDF-EOS data MODIS Algorithm Development ASTER Science Exploration
Algorithm Development Winds [m/s] Heights [m] Courtesy of Kevin Mueller at JPL, California
Science Exploration Jan Zonal Monthly Mean (2000 ― 2009; ocean only)
Science Exploration Jul Zonal Monthly Mean (2000 ― 2009; ocean only)
Science Exploration Sep. 16, 2010
Computational Prospection •Data I/O Speed About 30% of computation time is spent on I/O… •File size > 50% of content not used •Visualization Synchronizing multiply fields from multiply HDF files Simple manipulation (+, -, x, G(L)T_mask,…) Fast, Fast, Fast!!!
Summary •We are willing to collaborate with HDF developers •Free software support is always welcome
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