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How ACORN data is shown on the IMOS OceanCurrent website

How ACORN data is shown on the IMOS OceanCurrent website. David Griffin CSIRO Marine and Atmospheric Research. Purpose of OceanCurrent. To provide a diverse range of user groups with a quick look at a wide range of data types – not the details of any. A (not exclusive) emphasis on now.

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How ACORN data is shown on the IMOS OceanCurrent website

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  1. How ACORN data is shown on the IMOS OceanCurrent website David Griffin CSIRO Marine and Atmospheric Research

  2. Purpose of OceanCurrent • To provide a diverse range of user groups with a quick look at a wide range of data types – not the details of any. • A (not exclusive) emphasis on now. • National coverage. Not tied to any node or facility. • Not interactive. Not a data portal. Just maps and words. • Interpret the data, explain the methods. Integrate the MOS. • Exercise the data system. Identify data mgt inconsistencies. • Eventually: statistical products, not just snapshots and animations

  3. Use of ACORN • Went ‘live’ on 8 June 2012, ie plots update automatically • Showing ROT, SAG, BONC, COF and CBG on top of SST, altimetry, drifters, ANMN and soon: gliders and chlor-a • TURQ is on a secret page because the data look wrong • COF and BONC have lesser problems • CBG is OK but the tides are strong and coverage intermittent • ROT provides the best eye candy – hence the Ocean News item.

  4. Stumbling blocks • Several ‘inconveniences’ (for users) could be removed: • Hourly data stored 1 record per file -> 8 hours to read a year. • Seb has now made monthly files with ~24*30 records –should be much faster to read. • QC flags not useful (and too numerous) • CODAR: • hidden in a folder called ‘Sea state’ – but no wave data. • No TIME dimension. (Time is an attribute, not a variable). • List of points. User must infer the grid. • Many files with no data • Main issue: gappiness. We were warned.

  5. TURQ data (northern array) are clearly wrong:

  6. Conclusion • Congratulations to those who have got us to where we are now! • ACORN has a wide range of practical as well as research uses. • Some issues need addressing: • File formats • Calibration • De-tiding. Files could include tidal current predictions, especially for CBG. In turn, analyses of ACORN data will improve those predictions. • Need longer range. Neptune system for GAB/Browse/NWS? • Bluelink will be using ACORN mostly for validation. But Au-focussed projects will assimilate the data into models – and then be hungry mouths.

  7. Thankyou Insert presentation title

  8. Data reading • We use toolsIU.jar (via Matlab’s java virtual machine) for reading the files from the server. FFI: http://www.unidata.ucar.edu/software/netcdf-java/documentation.htm • The harder job is knowing 1) what files are there and 2) what’s in them. • To solve (1) we use Laurent Besnard’s List_NC_recur.m • To solve (2) we simply rummage the metadata with a browser.

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