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HDF-EOS Aura File Format Guidelines

HDF-EOS Aura File Format Guidelines. Cheryl Craig September 20, 2000. Aura Data System Working Group will meet in October to discuss and hopefully adopt Authors from each instrument team are in agreement. Preliminary.

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HDF-EOS Aura File Format Guidelines

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  1. HDF-EOS Aura File Format Guidelines Cheryl Craig September 20, 2000

  2. Aura Data System Working Group will meet in October to discuss and hopefully adopt Authors from each instrument team are in agreement Preliminary

  3. Third in series of EOS atmospheric chemistry satellites (1:45 PM equator crossing time) Formerly known as CHEM To be launched June 2003 Level 2 data products include: Vertical profiles of temperature, pressure, chemical and aerosol species Column amounts of chemical species Cloud properties What Is Aura?

  4. HIRDLS (High Resolution Dynamics Limb Sounder) Limb infrared sounder University of CO and Oxford MLS (Microwave Limb Sounder) Limb microwave sounder JPL OMI (Ozone Monitoring Instrument) Nadir wide-field-imaging spectrometer Netherlands, Finland and US TES (Tropospheric Emission Spectrometer) Nadir and limb infrared-imaging spectrometer JPL All instruments have world-wide co-investigators Aura Instruments

  5. HDF-EOS Swath allows a lot of flexibility Ease cross-platform use of Aura files Ease development of software Easier to understand Intended to standardize Level 2 files (may apply to Level 3 and above as well) Why Guidelines for Aura Instruments?

  6. Organization of data fields and attributes Dimension names Geolocation names and dimension ordering Data field names and dimension ordering Units for data fields Attribute names, values and units Areas of Potential Mismatch

  7. Instrument teams will use the same major version of HDF-EOS Aura Level 2 files will use HDF-EOS Swath HDF-EOS structure names will strictly adhere to Valids list Data will be reported on a pressure grid and be ordered from ground to space Guidelines List

  8. Data fields will be ordered with pressure coordinate being the fastest incrementing coordinate Data fields will be in units specified HDF fill value and MissingValue will have the same value Instrument data fields unique to particular instrument will be prefixed with instrument name Guidelines List (continued)

  9. Swathname: Instrument Name Dimensions: nTimes nLevels etc. Geolocation Fields: Time Latitude etc. Data Fields: Temperature O3 etc. Global Attributes: Instrument Name Process Level etc. Swathname: Meas. Species Name Dimensions: nTimes nLevels etc. Geolocation Fields: Time Latitude etc. Data Fields: L2gpValue L2gpPrecision Global Attributes: Instrument Name Process Level etc. Organization of Data Fields and Attributes Type 1 Type 2 • HDF-EOS V3.x Note – Two types may be merged into one using links for Data Field Names

  10. Adhere to strict names (spacing and capitalization required) Dimension names Geolocation Fields – Used to hold descriptor data (includes SolarZenithAngle, OrbitAscendingFlag, etc.) Data Fields – Contains measured and derived data Global Attributes – Includes InstrumentName and ProcessLevel Data Field Attributes – only if use HDF-EOSV3 (includes MissingValue, ScaleFactor, Units, etc.) Standard Names

  11. HDF-EOS V2.x PROS Currently used by Terra and Aqua teams Currently available CONS Based on HD4 – supported by HDF group in maintenance only mode HDF-EOS V3.x PROS Contains new functionality local data attributes more than one unlimited dimension compression with unlimited dimensions Based on HDF5 CONS IDL support (unknown?) HDF-EOS V2.x Versus V3.x Aura will decide at future date. At January, 2000 DSWG, indicated desire to used V3.x if packages like IDL will be available in V3.x

  12. Preliminary standardization complete – meeting in October to discuss and adopt HDF-EOS version decision to be decided at a future date Some decisions postponed until prototyping efforts complete Standard may evolve as instrument teams get better understanding of their data storage needs URL of document: http://www.eos.ucar.edu/hirdls/HDFEOS_Aura_File_Format_Guidelines.pdf Conclusions

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