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    • VIIRS/NPP Land Surface Temperature/Emissivity 8-Day L3 Global 1km SIN Grid V001

    Metadata Updated: December 6, 2023

    The NASA Suomi National Polar-Orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Land Surface Temperature and Emissivity (LST&E) 8-day product (VNP21A2) combines the daily (VNP21A1D) (http://doi.org/10.5067/VIIRS/VNP21A1D.001) and (VNP21A1N) (http://doi.org/10.5067/VIIRS/VNP21A1N.001) products over an 8-day compositing period into a single product.

    The VNP21A2 dataset is an 8-day composite LST&E product at 1 kilometer resolution that uses an algorithm based on a simple-averaging method. The algorithm calculates the average from all the cloud-free VNP21A1D and VNP21A1N daily acquisitions from the 8-day period. Unlike the VNP21A1 datasets where the daytime and nighttime acquisitions are separate products, the VNP21A2 contains both daytime and nighttime acquisitions as separate science dataset (SDS) layers within a single Hierarchical Data Format (HDF) file.

    The VNP21A2 product is developed synergistically with the Moderate Resolution Imaging Spectroradiometer (MODIS) LST&E Version 6 product (MOD21A2) (https://doi.org/10.5067/MODIS/MOD21A2.006) 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) (https://lpdaac.usgs.gov/documents/428/VNP21_ATBD_V1.pdf). VIIRS LST&E products are available 2 months after acquisition due to latency of data inputs.

    The VNP21A2 product contains 11 Science Datasets (SDS): LST, quality control, view zenith angle, and time of observation for both day and night observations along with emissivity for bands M14, M15, and M16. Low-resolution browse images for day and night LST are also available for each VNP21A2 granule.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Browse image for Earthdata Search

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date December 6, 2023
    Publisher LP DAAC
    Maintainer
    Identifier C1553237573-LPDAAC_ECS
    Data First Published 2018-10-03
    Language en-US
    Data Last Modified 2018-10-03
    Category NPP-JPSS, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation Glynn Hulley, Simon Hook . 2019-07-09. VNP21A2. Version 001. VIIRS/NPP Land Surface Temperature/Emissivity 8-Day L3 Global 1km SIN Grid V001 . Sioux Falls, SD, USA . Archived by National Aeronautics and Space Administration, U.S. Government, NASA EOSDIS Land Processes DAAC . https://doi.org/10.5067/VIIRS/VNP21A2.001. https://doi.org/10.5067/VIIRS/VNP21A2.001. Digital Science Data. This data set was provided by the NASA/NOAA NPP Project. The DOI landing page provides citations in APA and Chicago styles. .
    Creator Glynn Hulley, Simon Hook
    Data Presentation Form Digital Science Data
    Graphic Preview Description Browse image for Earthdata Search
    Graphic Preview File https://e4ftl01.cr.usgs.gov//WORKING/BRWS/Browse.001/2019.05.31/BROWSE.VNP21A2.A2019113.h16v07.001.2019150110840.1.jpg?_ga=2.88990040.2140299264.1561987470-1109527761.1561753117
    Harvest Object Id 7230bc49-227a-4f9b-9730-2e0e56a63248
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/VIIRS/VNP21A2.001
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Release Place Sioux Falls, SD, USA
    Series Name VNP21A2
    Source Datajson Identifier True
    Source Hash f041dd3380a5f40b018caaaa0258c30ee2dc216789228aa7239eca9c0f24434c
    Source Schema Version 1.1
    Spatial
    Temporal 2012-01-25T00:00:00Z/2022-01-17T00:00:00Z

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