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

Published by LP DAAC | National Aeronautics and Space Administration | Metadata Last Checked: August 03, 2025 | Last Modified: 2025-07-17
The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi 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) (https://doi.org/10.5067/VIIRS/VNP21.001) 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) (https://doi.org/10.5067/MODIS/MOD21A1N.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/1332/VNP21_ATBD_V1.pdf). 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.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
                                            [
  "026:00"
]
contactPoint 
                                            {
  "fn": "Glynn Hulley",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:glynn.hulley@jpl.nasa.gov"
}
description The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi 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) (https://doi.org/10.5067/VIIRS/VNP21.001) 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) (https://doi.org/10.5067/MODIS/MOD21A1N.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/1332/VNP21_ATBD_V1.pdf). 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.
distribution 
                                            [
  {
    "@type": "dcat:Distribution",
    "title": "Download this dataset through Earthdata Search",
    "format": "application/x-hdf",
    "mediaType": "application/x-hdf",
    "description": "Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data.",
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  },
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    "@type": "dcat:Distribution",
    "title": "View this dataset's science data product validation documentation",
    "format": "HTML",
    "mediaType": "text/html",
    "description": "Further details regarding VIIRS product validation and maturity status are available from VIIRS Land Product Quality Assessment site.",
    "downloadURL": "https://viirsland.gsfc.nasa.gov/Val_overview.html"
  },
  {
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    "title": "Google Scholar search results",
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  },
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    "title": "View this dataset's algorithm theoretical basis document",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products.",
    "downloadURL": "https://lpdaac.usgs.gov/documents/1332/VNP21_ATBD_V1.pdf"
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  },
  {
    "@type": "dcat:Distribution",
    "title": "This dataset's landing page",
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    "@type": "dcat:Distribution",
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  },
  {
    "@type": "dcat:Distribution",
    "title": "View this dataset's science data product validation documentation",
    "format": "HTML",
    "mediaType": "text/html",
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    "downloadURL": "https://viirsland.gsfc.nasa.gov/Val/LST_Val.html"
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]
identifier C1442270801-LPDAAC_ECS
issued 2019-07-09
keyword 
                                            [
  "earth-science",
  "land-surface",
  "surface-radiative-properties",
  "surface-thermal-properties"
]
landingPage https://doi.org/10.5067/VIIRS/VNP21A1N.001
language 
                                            [
  "en-US"
]
modified 2025-07-17
programCode 
                                            [
  "026:001"
]
publisher 
                                            {
  "name": "LP DAAC",
  "@type": "org:Organization"
}
spatial -180.0 -90.0 180.0 90.0
temporal 2012-01-19T00:00:00Z/2024-06-03T00:00:00Z
theme 
                                            [
  "NPP-JPSS",
  "geospatial"
]
title VIIRS/NPP Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid Night V001

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