Published on February 21, 2014
HDF-EOS Development Current Status and Schedule Larry Klein, Alex Muslimov & David Wynne Emergent Information Technologies, Inc. February 27, 2002 larry @eos.hitc.com, email@example.com 1
HDF-EOS 2 • HDF4 based, storage format for EOS standard products. • Used operationally by MODIS, MISR, ASTER, Landsat, other EOS instruments • Will be used by EOS Aqua instruments. • Support for Grid/Point/Swath structures • HDF4, HDF-EOS 2 will be supported by NCSA/NASA for the fore-seeable future. 2
Current Archive Holdings • GSFC DAAC: MODIS L1, L2 Atmos./Ocean – 416 TB 5,182,000 granules (EOS Terra) • EDC DAAC: Landsat/ASTER/MODIS Land – 323 TB 3,551,000 granules • Langely DAAC: MISR – 141 TB 1,266,000 granules • NSIDC DAAC: MODIS L2, L3 – 10 TB 887,000 granules 3
HDF-EOS 5 • Based on HDF5, a complete rewrite of HDF4 with a different interface. – First released in 2000. • Designed to ‘resemble’ HDF-EOS 2 to the maximum extent possible. – – – – Support same data structures Added prefix ‘HE5_’ to HDF-EOS 2 functions. Doesn’t preclude HDF5 functionality. Data Type changes, e.g. INT64 -> 4 H5T_NATIVE_LONG
HDF-EOS 2 -> HDF-EOS 5 •HDF-EOS 2 SWdefdatafield(swathID, fieldname, dimlist, numtype, merge) •HDF-EOS 5 HE5_SWdefdatafield(swathID, fieldname, dimlist, maxdimlist, numtype, merge, Maxdimlist*) *New HDF5 functionality passed through. This allows the user to set an upper limit to the size of the dataset. 5
HDF-EOS 5 • Provide a conversion tool: heconvert – HDF-EOS 2 -> HDF-EOS 5 – compliments HDF4 -> HDF5 conversion tool • HDF-EOS 5 will be used by EOS Aura – Standard format for profile data developed • Assume that HDF-EOS 2 producers will convert when PI’s determine that the time is right. 6
HDF-EOS 5 Functionality • • • • • • • • Basic File I/O Fill Values Compression Chunking/Tiling Swath Interface Grid Interface Point Interface Profile Interface • Global (File), Group & Local Attributes • External Data Files • Subsetting • Unix/Linux Support • Threadsafe Version • FORTRAN, C, C++ • General Table Interface (proposed) 7
Top Level of HDF-EOS 5 File Root -- “/” HDFEOS INFORMATION HDFEOS STRUC. METADATA ADDITIONAL SWATH GRID POINT Global (File) Attributes The new ADDITIONAL Group has global (file) attributes The new functionality is added to the EH(utility) interface. 8
Swath Structure Global Attribute <SwathName>:<AttrName> Group Attribute <DataFields>:<AttrName> Local Attribute <FieldName>:<AttrName> SwathName Data Fields Data Data Field.1 Field.n Profile Fields Profile Field.1 Profile Field.n Geolocation Fields Longitude Latitude Time Each Data Field can have Attributes and/or Dimension Scales Group CoLatitude Shaded Objects are implemented in a fixed way so the user doesn’t have direct access via the interface Attribute Data Set 9
ECS support of HDF5 • ECS toolkit V 5.2.8 supports HDF4 and HDF5 - based applications (eg. Metadata access – HDF-EOS 2.7 (HDF4.1r5) – HDF-EOS 5.1 (hdf5-1.4.1) • HDF5 and HDF4 must be compiled – HDF4 users not affected – HDF5 users must use PGS_MET_SDstart() and PGS_MET_SDend() 10
ECS support of HDF5 • Both flavors of HDF-EOS (HDF) part of ECS baseline. • ECS will not crack HDF5 - based files for near future. (contents transparent to archive) • Size limit is 2 GBytes 11
Applications • HE5View (HDF-EOS 5 browser) • Java Earth Browser (HDF-EOS 2 and 5 access) • HDF-EOS to GeoTIFF converter (HDF4 based only) • heconvert (convert HDF-EOS 2 Grid/Point/Swath to HDF-EOS 5 equivalents) • Access libraries and applications at: http://newsroom.gsfc.nasa.gov/sdptoolkit/toolkit .html 12
Issues • Compound data types in FORTRAN77 • Chunking with variable length and compound data types • Only deflation compression method implemented. • File size limit in ECS - Is two Gbytes enough? 13
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