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HDF-EOS 3.0 Functional and Structural Design

HDF-EOS 3.0 Functional and Structural Design. David Wynne/Alex Muslimov Emergent Information Technologies, Inc. September 19, 2000 davidw@eos.hitc.com/amuslimo@eos.hitc.com. HDF-EOS 3.0. Based on HDF5, with input from NCSA with respect to Design, Implementation and Method

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HDF-EOS 3.0 Functional and Structural Design

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  1. HDF-EOS 3.0 Functional and Structural Design David Wynne/Alex Muslimov Emergent Information Technologies, Inc. September 19, 2000 davidw@eos.hitc.com/amuslimo@eos.hitc.com

  2. HDF-EOS 3.0 • Based on HDF5, with input from NCSA with respect to Design, Implementation and Method • Working with EOS AURA teams to Refine Design • Primary Goal of Design -- minimal impact to Heritage Code

  3. Current HDF-EOS 3.0 Functionality • Basic File I/O • FillValues • Compression • Chunking/Tiling • Swath Interface • Grid Interface • FORTRAN Wrappers • Profile Interface • Global, Group & Local Attributes • Extendable DataSets • Test Drivers • User’s Guide • Subsetting • SUN, SGI & DEC

  4. Functional Specification • Swath File Access • SWopen, SWcreate, SWattach, SWdetach and SWclose • Dimension/ Mapping Definition • SWdefdim, SWdefdimmap and SWdefidxmap • Field Definition/Compression/Chunking • SWdefgeofield*, SWdefdatafield*, SWdefcomp and • SWdefcomchunk • Field I/O, Inquiry and Info • SWwritefield, SWreadfield, SWinqdatafields, SWinqgeofield • and SWfieldinfo* • *Function interface has changed between HDF-EOS 2.x and 3.0 • Function names italicized represent new functionality

  5. Functional Specification, cont. • Attribute I/O, Inquiry and Info • SWwriteattr, SWreadattr, SWinqattrs, SWattrinfo • SWwritegrpattr, SWreadgrpattr, SWinqgrpattrs, SWgrpattrinfo • SWwritelocattr, SWreadlocattr, SWinqlocattrs and SWlocattrinfo • General Inquiry and Info • SWinqswath, SWnentries, SWinqdims, SWdiminfo, • SWinqmaps, SWmapinfo, SWinqidxmaps and SWidxmapinfo • Subsetting • SWdefboxregion, SWdeftimeperiod, SWregioninfo, • SWperiodinfo, SWextractregion and SWextractperiod • Profile • PRdefine, PRread, PRwrite, PRinquire and PRinfo • Function names italicized represent new functionality

  6. Functional Specification, cont. • HDF-EOS 2.6 • SWdefdatafield(swathID, fieldname, dimlist, numtype, merge) • HDF-EOS 3.0 • 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.

  7. Top Level of HDF-EOS 3.0 File Root -- / HDFEOS POINTS HDFEOS INFORMATION SWATHS GRIDS Miscellaneous Proposed Group, User Input Group

  8. Top Level of HDF-EOS 3.0 File HDFEOS HDFEOS INFORMATION HDFEOSVersion StructMetadata.0 Data Set Attribute Group

  9. Swath Structure SwathName Global Attribute <SwathName>:<AttrName> Group Attribute <DataFields>:<AttrName> Data Fields Profile Fields Geolocation Fields Local Attribute <FieldName>:<AttrName> Profile Field1 Profile Fieldn Longitude Latitude Data Field1 Data Fieldn Each Data Field can have Attributes and/or Dimension Scales Time CoLatitude Dimension Scale Shaded Objects are implemented in a fixed way so the user doesn’t have direct access via the interface DataField1:DIMENSIONLIST Proposed Attribute, User Input Message Attribute <SwathName>:<AttrName> Data Set Attribute Group

  10. Profile Structure SwathName Global Attribute <SwathName>:<AttrName> Group Attribute <DataFields>:<AttrName> Profile Fields Geolocation Fields Local Attribute <FieldName>:<AttrName> Profile Field1 Profile Fieldn Longitude Latitude Each Data Field can have Attributes and/or Dimension Scales Dimension Scale Time CoLatitude DataField1:DIMENSIONLIST Message Attribute <SwathName>:<AttrName> Proposed Attribute, User Input Data Set Attribute Group

  11. Grid Structure Global Attribute <GridName>:<AttrName> GridName _BLKSOM: Group Attribute <DataFields>:<AttrName> Data Fields Local Attribute <FieldName>:<AttrName> Data Field1 Data Fieldn Message Attribute <GridName>:<AttrName> Each Data Field can have Attributes and/or Dimension Scales Dimension Scale Proposed Attribute, User Input Shaded Objects are implemented in a fixed way so the user doesn’t have direct access DataField1:DIMENSIONLIST Data Set Attribute Group

  12. Point Structure Global Attribute <PointName>:<AttrName> PointName _LevelWritten Group Attribute <DataFields>:<AttrName> Linkage Data Object Reference FWD POINT Level1 Name Local Attribute <LevelName>:<AttrName> BCK POINT Leveln Name Object Reference Message Attribute <PointName>:<AttrName> Proposed Attribute, User Input Shaded Objects are implemented in a fixed way so the user doesn’t have direct access Data Set Group Attribute

  13. Issues • Maximum size of variable length and compound data types • Chunking with variable length and compound data types • Only deflation compression method implemented. • File size limit in ECS - Is two Gbytes enough?

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