Visible/Infrared Imager/Radiometer Suite (VIIRS)

Beginning Orbit Number

An integer representing the number of the orbit at the start of the data collection for a data granule. The orbit number is incremented at each ascending node equatorial crossing.

Data Usage Guidance/Restrictions

The operational data for this datatype is available to all registered CLASS users. Pre-operational data may be restricted to authorized users. To become an authorized user, send a request to the CLASS Help Desk.

 

Dataset Name

The name of the Level 1B data set archived at CLASS. The name has the following format: ProductID_npp_dyyyymmdd where ProductID=any 5-character data product ID, yyyy=4-digit year, mm=2-digit month, dd=2-digit day or entire dataset name.

With the release of B2.0 on 3/8/17, the file naming convention remained the same, but the values in the 'origin' field changed (see last field excluding the extension). For B1.2, the origin value was 'noaa'. With B2.0, the origin values are 'noau', 'noac', 'nobc', 'nobu', 'cocu', and 'cocc'. 4-character 'origin' field:

  • 1st character - NSOF or CBU created the product
  • 2nd character - indicates Operational
  • 3rd character - indicates which IDPS string produced the product (a/b/c)

    • 4th character - indicates product delivery compression - 'c' for compressed or 'u' for uncompressed

    Datatype

    These are the following types of NPP Data Products: Raw Data Records (RDRs), Sensor Data Records (SDRs), Temperature Data Records (TDRs), Deliverable Intermediate Products (IPs), Environmental Data Records (EDRs), Application Related Products (ARPs)

    Granule ID

    The unique identifier for each RDR granule composed of the concatenation of two components: (1) The three character satellite identifier, (2) A zero left filled, 12 character number, specifying the number of tenths of a second since the first ascending node after launch.

    Satellite

    Abbreviation that identifies the satellite that acquired the dataset.

    Spatial

    Refers to the geographic area of interest to the user. This section of the search page allows the user to define the geographic area of interest.

    Temporal

    Refers to the time span of interest to the user. This section of the search page allows the user to define the range of dates/times of interest.

    UTC

    Coordinated Universal Time (UTC) is the international time standard. It is the current term for what was referred to as Greenwich Meridian Time (GMT). Zero (0) hours UTC is midnight in Greenwich England, which lies on the zero longitudinal meridian. Universal time is based on a 24 hour clock, therefore, afternoon hours such as 4 pm UTC are expressed as 16:00 UTC (sixteen hours, zero minutes).

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