VIIRS/JPSS1 Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid Night V002

The NOAA-20 Visible Infrared Imaging Radiometer Suite (VIIRS) Land Surface Temperature and Emissivity (LST&E) Night Version 2 product (VJ121A1N) is compiled daily from nighttime Level 2 Gridded (L2G) intermediate products.
The L2G process maps the daily VJ121 swath granules onto a sinusoidal MODIS grid and stores all observations overlapping a gridded cell for a given night. The VJ121A1 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 VJ121A1N product is developed synergistically with the Moderate Resolution Imaging Spectroradiometer (MODIS) LST&E Version 6.1 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). The VJ121A1N 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 VJ121A1N granule. Known Issues

For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website and the User Guide.

Data and Resources

Additional Info

Field Value
Last Updated February 24, 2026, 06:14 (UTC)
Created February 24, 2026, 03:28 (UTC)
creationMethod <p>Read "Description" section of metadata to learn more about creation method.</p>
dataAuthType public
dataType TIFF
datasetVersion 002
docsURL https://www.earthdata.nasa.gov/data/catalog/lpcloud-vj121a1n-002
doi https://doi.org/10.5067/VIIRS/VJ121A1N.002
issueDate 2018-01-01T00:00:00.000Z
lastUpdateDate 2023-06-29T00:00:00.000Z
pocEmail lpdaac@usgs.gov
pocName NASA Land Processes DAAC (LP DAAC)
status submitted
theme ["NASA/IMPACT"]
updateFreq As needed
uploadType dataset