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NVODS and the Live Access Server (LAS)

The NVODS National Workshop held from September 10-12, 2003, aimed to provide a standardized level of geo- and time-referenced on-line browse access for all NVODS data. This workshop identified the importance of on-line browsing as a bridge to desktop access, broadening data reach for educators, recreationalists, and policymakers, while enhancing visibility and success. Participants discussed the LAS as an information product server utilizing metadata, OPeNDAP for remote data access, and developing capabilities for improved data interaction and synchronization.

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NVODS and the Live Access Server (LAS)

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  1. NVODS and theLive Access Server (LAS) Steve Hankin, PI (NOAA/PMEL) Jon Callahan (U of WA/JISAO)Ansley Manke (NOAA/PMEL)Joe Mclean (U of WA/JISAO)Kevin O’Brien (U of WA/JISAO) Richard Rogers (U of WA/JISAO) Roland Schweitzer (U of CO/CIRES)Joe Sirott (contractor)NVODS National Workshop, Sep. 10-12, 2003

  2. Our goal: • Providea uniform, minimum guaranteed level of geo- and time-referenced on-line browse access for all NVODS data

  3. Why is this important to NVODS? • On-line browse is the bridge to desktop access:discover  browse  access • Broadens the reach of the data • educators, recreationalists, policy makers … • Increases visibility and tangible success

  4. LAS is an “Information Product Server” • Metadata (XML) contains the “intelligence” • Back end applications do the real work • OPeNDAP provides remote data access

  5. Tour of NVODS on-line browse via LAS …

  6. e.g. convert to Fahrenheit

  7. (new in v6.2) customizableinterfaces

  8. basic transformations

  9. “Sequence” (in-situ) data

  10. configurable constraints

  11. OPeNDAP output

  12. discover  browse  access

  13. discover  browse  access

  14. Scalability and robust comparison LAS “sisters” share metadata to form a unified (virtual) site.OPeNDAP allows LAS to difference distributed fields.

  15. FDS – Ferret DODS (“Data”) ServerUnder development (NOAA/HPCC funded) • Supplies OPeNDAP output from LAS (via Ferret) • Based upon COLA’s “anagram” (GDS) • Acts as an OPeNDAP “AIS” (e.g. fix mangled coordinates) • Inputs include (tab-)delimited, OPeNDAP, FORTRAN, … • “Constraint-free” server-side data transformations

  16. “Batch” access to products Query available data sets: Query variables in data set “model_1”: Query space-time domain: Request a subset of data as a file: (“asc” for ASCII format) >lasls http://cpu/LAS >lasls http://cpu/LAS  model_1 >lasls http://cpu/LAS  model_1  sst >lasget  -x 20:60  -y 20:60 -t 11-Dec-2000  -f asc        http://cpu/LAS  model_1 sst

  17. “Web Service” access to products • XML request protocol implemented and documented • XML “package” out implemented and documented • XML query protocol under development • formal SOAP interface under development

  18. Summary: LAS has gone a considerable way towards achieving its goal of providing on-line browse access to all NVODS data Pressing Challenges • Use new OPeNDAP aggregation capabilities(GoMOOS, NDBC and NAVO are in our development server now) • Use OPeNDAP Translation to access add’l HDF data • Use v6.2 configurability (esp. clickable map interfaces) • Easier configuration of new data sets (AIS!) • Improved sychronization(real-time updates and sister servers) • Fusion of Sequence and gridded data • Incorporation of FDS – full bi-directional OPeNDAP

  19. Questions?

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