NPP Data Ordering


Land SIPS distributes following versions of NPP data products archived in different archive sets in LAADS (Land SIPS data production and retention policy).

  • AS 3000 (IDPS): Products from IDPS, aggregated to ~5min granules at Land SIPS in HDF4 file format.
  • AS 3001 (SIPS): Products produced by Land SIPS using the IDPS software. This should match the corresponding product from IDPS in AS 3000.
  • AS 3002 (LPA): Products produced by Land SIPS using NASA science team (Land SIPS) adjusted (LPA) version of the IDPS software.
  • AS 3100 (LPAC1): Products produced by the C1 reprocessing of VIIRS instrument data at Land SIPS using the best available PGE versions, seed files and LUTs. L1B reprocessing is currently in progress. Reprocessing of all L2 and L3 xDRs and IPs are expected to start in Aug 2013.
  • AS3110 (C11): Products produced by the C1.1 reprocessing of VIIRS instrument data at Land SIPS.

Data in archive sets other than listed above are from science tests for review by designated science team members only.

Please note that the products are currently of BETA QUALITY and are not intended for scientific use. The global browse images of these products (IDPS, SIPS, LPA) are posted on the Land SIPS QA web site at http://landweb.nascom.nasa.gov/cgi-bin/NPP/browse/NPPbrowse.cgi

1. By logging to the ftp server

  • ftp ladsweb.nascom.nasa.gov
  • Login as anonymous.
  • cd allData/[as]/[product]/[yyyy]/[ddd]
      where
      as = Archive Set number (e.g. 3000)
      product = Product name (e.g. NPP_VSTIP_L2; see here for a list of product names)
      yyyy = Year (e.g. 2011)
      ddd = day of year (e.g. 325)
  • prompt
  • mget *.hhmm.*.hdf
      hhmm: granule identified by the approximate start time of the granule in hours and min (~ 5 min boundary)

2. Search and order from LAADS

  • Connect to http://ladsweb.nascom.nasa.gov/
  • Click on Data on the next page and on Search in the following page
  • Select Satellite/Instrument: NPOESS Preparatory Project VIIRS
  • Select Group: e.g. NPP Level2 5-minute Product
  • Select Product: e.g. NPP_VSTIP_L2
  • Temporal Selection: Enter the date time range e.g. to search from day 325 enter 2011-325 16:00:00 for start and 2011-325 18:45:00 for end
  • Collection Selection: Select an archive set #
  • Spatial Selection: Global will include all granules from the specified date/time range, Lat/Long will let you identify the region of your interest. Tiles are 1200 x 1200 km gridded regions in sinusoidal map projection.
  • Click on Search.
  • Follow the instructions on the web to place the order and/or download the data.