Distribution of NPP/VIIRS data through the NOAA Archives NASA Ocean Color Research Team Meeting 23 April 2012, Seattle, Washington Presenter: Axel Graumann,

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Presentation transcript:

Distribution of NPP/VIIRS data through the NOAA Archives NASA Ocean Color Research Team Meeting 23 April 2012, Seattle, Washington Presenter: Axel Graumann, NOAA/NESDIS/NCDC Additional contributors: Viva Banzon, Jonathan Blythe, Deirdre Byrne, Kenneth Casey, Paul DiGiacomo, Mitchell Goldberg, Kent Hughes, Edward Kearns, Mike Soracco, Tom Schott, Rick Stumpf, Ron Vogel, Menghua Wang, Cara Wilson, Banghua Yan

Overview of NPP, JPSS & VIIRS Suomi National Polar-Orbiting Partnership (NPP) Mission, launched 28 October 2011 Bridge to the Joint Polar Satellite System (JPSS) “The JPSS Program is a collaborative effort between NOAA and NASA with NOAA having overall responsibility, and NASA acting as NOAA’s acquisition agent and system integrator.” (JPSS Management Control Plan) The VIIRS (Visible Infrared Imager Radiometer Suite) sensor on NPP, future JPSS-1 provides ocean color and SST Global coverage and resolution - 750m (M bands)/375m (I bands) Official NPP Mission data is archived and distributed by the NOAA National Data Centers Big question: When are data available? When declared “beta” (see slide 6)

VIIRS Spectral Bands for Ocean Color VIIRS on Suomi NPP has Ocean and SWIR spectral bands similar to MODIS Spatial resolution for VIIRS M-band: 750 m, I-band: 375 m

NOAA NPP/VIIRS Data Access Sectors Archive Sector Long-term repository of NPP mission data Science Sector Data/product development; transition to operations; mission-level reprocessing and generation of science quality data Operational Sector Generation and provision of near-real time regional and global operational data ( Direct Broadcast Sector Provision of real time data on regional basis Science Sector Operational Sector Direct Broadcast Archive

The NOAA National Data Centers share an IT – infrastructure called the Comprehensive Large Array-Data Stewardship System (CLASS) CLASS serves as the official repository of NPP mission data, including VIIRS On-line search, order, and distribution of all archived VIIRS mission data is available through CLASS: NOAA NPP/VIIRS Archive Sector See our poster for information on the other sectors which provide various other data/ products with varying latencies, formats, etc. Where does NPP mission data live? Science Sector Operational Sector Direct Broadcast Archive

NPP VIIRS/Ocean Color Products Overview What NPP VIIRS mission data is available? *VIIRS Ocean Color EDRs: Normalized water-leaving radiances at VIIRS M1 to M5 bands & Chlorophyll-a. Other EDRs: Absorption & Backscattering coefficients at VIIRS M1-M5 bands. How is the NPP mission data generated? The official NPP mission RDRs, SDRs, and EDRs are presently generated via the JPSS Interface Data Processing Segment (IDPS) What other VIIRS data and information is (will be) available?  Also available in CLASS are ancillary and auxiliary supporting data.  Global Level 3 data will be available through NOAA CoastWatch (coastwatch.noaa.gov/) and archived in CLASS (~spring 2013)  Additional EDRs will be available over time based on demand & resources.

NOAA VIIRS Data in the NOAA Archive  Official NPP project data files (from IDPS) are in HDF5 format  Under VIIRS there are about 65 products (datatypes)  3 levels of operational data (RDRs, SDRs, and EDRs)  SDR and EDR channels (bands) in separate files  RDR Science Data includes all bands in one file  Additional files include ancillary data, auxiliary data, release packages (software, documentation, etc.)  Later products will be in NetCDF, CoastWatch HDF, etc. February 15, 2012 VIIRS Chlorophyll-a (IDPS)

Data Product Maturity Definitions 8 NPP SDR Product Maturity Levels: 1)Beta 2)Provisional 3)Validated/Calibrated NPP EDR Product Maturity Levels: 1)Beta 2)Provisional 3)Validated (3 stages)

Example NPP VIIRS Daily File Number and Volume by Product (datatype) Descriptive NameFilesVolume VIIRS Moderate Resolution Band 01 SDR254 6 GBs VIIRS Moderate Resolution Band 02 SDR254 6 GBs VIIRS Moderate Resolution Band 03 SDR254 9 GBs VIIRS Moderate Resolution Band 04 SDR254 9 GBs VIIRS Moderate Resolution Band 05 SDR GBs VIIRS Moderate Resolution Band 06 SDR254 6 GBs VIIRS Moderate Resolution Band 07 SDR25417 GBs VIIRS Moderate Bands SDR Geolocation25479 GBs VIIRS Sea Surface Temperature EDR25419 GBs VIIRS Ocean Color/Chlorophyll EDR25493 GBs VIIRS Science RDR25457 GBs Descriptive NameFilesVolume VIIRS Moderate Resolution Band 01 SDR254 6 GBs VIIRS Moderate Resolution Band 02 SDR254 6 GBs VIIRS Moderate Resolution Band 03 SDR254 9 GBs VIIRS Moderate Resolution Band 04 SDR254 9 GBs VIIRS Moderate Resolution Band 05 SDR GBs VIIRS Moderate Resolution Band 06 SDR254 6 GBs VIIRS Moderate Resolution Band 07 SDR25417 GBs VIIRS Moderate Bands SDR Geolocation25479 GBs VIIRS Sea Surface Temperature EDR25419 GBs VIIRS Ocean Color/Chlorophyll EDR25493 GBs VIIRS Science RDR25457 GBs

Granule comparison between MODIS and VIIRS  VIIRS archived data are grouped into aggregates  One aggregate equals four granules  Aggregate length is 5.7 min (342.8 sec)  Bottom line: VIIRS files are larger than MODIS files!  72 granules per orbit or 18 aggregates per orbit Coverage of MODIS Granules Granule length: 5 min Coverage of MODIS Granules Granule length: 5 min Coverage of VIIRS Granules Granule length: 85.7 sec Coverage of VIIRS Granules Granule length: 85.7 sec

NOAA VIIRS Ocean Color Data Access Some general notes on the design and capabilities of CLASS:  The NOAA CLASS data storage system is not designed for real- time operations.  At least six hours elapse before data are ingested into CLASS from the NPP IDPS. (Other sectors support real-time)  Users must create an account to be able to access the data.  Different levels of services: Ad hoc, large and subscription  Direct download is currently not supported Science Sector Operational Sector Direct Broadcast Archive

CLASS Home Page

NOAA VIIRS Ocean Color Data Access How do I order from CLASS?  Step 1: Register for a user id account at – minimal information: your name, address, a password  Step 2: Select from the drop down product menu and highlight NPP VIIRS  Step 3: From the the search interface find data of interest. Select geographic region, enter start/end dates and times, and select one or more data types (different products or spectral bands).  Step 4: Determine if you need greater access or a subscription Note: Always provide your user ID when contacting the CLASS helpdesk

For technical questions regarding how to use CLASS: Notes on using CLASS: NPP Access tutorial (see link at in the News section: ( CLASS_Tutorial_NPPDataAccess_ pdf) Check the NPP FAQ page for operational start dates, data gaps, product maturity levels, etc. ( Visit as at the poster session if you like a hands-on review of CLASS NOAA VIIRS Ocean Color Data Access: Assistance and support

So now you’ve acquired some VIIRS data … JPSS Software Processing Packages Algorithm Development Library (ADL) (see poster by Jiang et al.) (  Provides the science community with a simple method for testing and proving algorithms to be used in Interface Data Processing Segment (IDPS)  ADL includes all source codes, lookup tables, and test data  Users can run ADL in their own Linux systems There are other VIIRS data processing systems used by various groups (e.g., NOAA-MSL12, NASA-l2gen, NRL-APS). What’s coming up?  CoastWatch will produce & distribute global Level 3 products (daily, weekly and monthly), initially at reduced resolution (~spring 2013), eventually at full resolution.  Dedicated NOAA ocean color website w/VIIRS information, FAQ, data links et al.