VNP21A1N_001

VIIRS/NPP Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid Night V001

Version 001
  • Abstract
    The NASA Suomi National Polar-Orbiting Partnership (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Land Surface Temperature and Emissivity (LST&E) Night Version 1 product (VNP21A1N) is compiled daily from nighttime Level 2 Gridded (L2G) intermediate products. The L2G process maps the daily VNP21 swath granules onto a sinusoidal MODIS grid and stores all observations overlapping a gridded cell for a given night. The VNP21A1 algorithm sorts through all these observations for each cell and estimates the final LST value as an average from all cloud-free observations that have good LST accuracies. The nighttime average is weighted by the observation coverage for that cell. Only observations having observation coverage more than a certain threshold (15%) are considered for this averaging. The 1 kilometer dataset is derived through resampling the native 750 meter VIIRS resolution in the input product. The VNP21A1N product is developed synergistically with the Moderate Resolution Imaging Spectroradiometer (MODIS) LST&E Version 6 product (MOD21A1N) using the same input atmospheric products and algorithmic approach. The overall objective for NASA VIIRS products is to ensure the algorithms and products are compatible with the MODIS Terra and Aqua algorithms to promote the continuity of the Earth Observation System (EOS) mission. Additional details regarding the method used to create this Level 3 (L3) product are available in the Algorithm Theoretical Basis Document (ATBD). VIIRS LST&E products are available 2 months after acquisition due to latency of data inputs. The VNP21A1N product contains seven Science Datasets (SDS): LST, quality control, emissivity for bands M14, M15, and M16, view zenith angle, and time of observation. A low-resolution browse image for LST is also available for each VNP21A1N granule.
  • Purpose
    Science Research
  • Version Description
    Collection Version 1 Processing and Reprocessing
  • DOI

    10.5067/VIIRS/VNP21A1N.001

    https://doi.org

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    2G

    Sensor Measurements

    Quality
    Collection Progress

    Active

    Access Constraints

    None

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • LAND SURFACE
    • SURFACE RADIATIVE PROPERTIES
    • REFLECTANCE

Acquisition Information Fields:

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Platforms
  • Spacecraft
    SUOMI-NPP
    Instruments
    • VIIRS
Projects
Project Short Name Campaigns Project Dates
JPSS
  • JPSS
 No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL

Data Centers

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  • LP DAAC
    ARCHIVER
    Land Processes Distributed Active Archive Center

    U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center
    Sioux Falls, South Dakota 57198

    M-F, 8 a.m. to 4 p.m. Central Time
    • 605-594-6116
    • 866-573-3222
    • Email
    Contact Details

    LP DAAC User Services is the point of contact for answering questions concerning data products, data access, and online applications.

    The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products.

    https://lpdaac.usgs.gov/
    • Home Page
  • NASA/GSFC/SED/ESD/TISL/LandSIPS
    PROCESSOR
    Land Science Investigator-led Processing System, Terrestrial Information Systems Laboratory, Earth Sciences Division, Sciences and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

    https://landweb.modaps.eosdis.nasa.gov/NPP_QA/
    • Home Page

Data Contacts

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  • LP DAAC User Services
    User Services
    LP DAAC User Services

    LP DAAC

    U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center
    Sioux Falls, South Dakota 57198

    M-F, 8 a.m. to 4 p.m. Central Time
    • 605-594-6116
    • 866-573-3222
    • Email
    Contact Details

    LP DAAC User Services is the point of contact for answering questions concerning data products, data access, and online applications.

    The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products.

    https://lpdaac.usgs.gov/
    • Home Page

Collection Citations Fields:

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    Collection Citations
    • Collection citation title not provided

      This data set was provided by the NASA/NOAA NPP Project.

Metadata Dates
Creation
Last Revision