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

The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Land Surface Temperature and Emissivity (LST&E) Day Version 1 product (VNP21A1D) is compiled daily from daytime 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 day. 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 daytime 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 VNP21A1D product is developed synergistically with the Moderate Resolution Imaging Spectroradiometer (MODIS) LST&E Version 6 product (MOD21A1D) (https://doi.org/10.5067/MODIS/MOD21A1D.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 VNP21A1D 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 VNP21A1D granule.

Data and Resources

Additional Info

Field Value
Maintainer Glynn Hulley
Last Updated April 23, 2025, 22:47 (UTC)
Created April 23, 2025, 22:47 (UTC)
accessLevel public
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citation Glynn Hulley, Simon Hook . 2019-07-09. VNP21A1D. Version 001. VIIRS/NPP Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid Day V001 . Sioux Falls, South Dakota, USA. Archived by National Aeronautics and Space Administration, U.S. Government, NASA EOSDIS Land Processes Distributed Active Archive Center. https://doi.org/10.5067/VIIRS/VNP21A1D.001. https://doi.org/10.5067/VIIRS/VNP21A1D.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.001/2019.05.30/BROWSE.VNP21A1D.A2019120.h17v05.001.2019150004150.1.jpg?_ga=2.101614658.2140299264.1561987470-1109527761.1561753117
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harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C1442270800-LPDAAC_ECS
issued 2019-07-09
landingPage https://doi.org/10.5067/VIIRS/VNP21A1D.001
language {en-US}
metadata_type geospatial
modified 2019-07-09
programCode {026:001}
publisher LP DAAC
release-place Sioux Falls, South Dakota, USA
resource-type Dataset
series-name VNP21A1D
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temporal 2012-01-19T00:00:00Z/2024-06-03T00:00:00Z
theme {NPP-JPSS,geospatial}