![NASA/VIIRS/002/VNP21A1D](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_VIIRS_002_VNP21A1D_sample.png) Dataset Availability : 2012-01-19T00:00:00Z--2026-11-02T00:00:00Z Dataset Producer : [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/VIIRS/VNP21A1D.002) Cadence : 1 Day Tags : [daily](https://developers.google.com/earth-engine/datasets/tags/daily) [day](https://developers.google.com/earth-engine/datasets/tags/day) [land](https://developers.google.com/earth-engine/datasets/tags/land) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa) [noaa](https://developers.google.com/earth-engine/datasets/tags/noaa) [surface](https://developers.google.com/earth-engine/datasets/tags/surface) [temperature](https://developers.google.com/earth-engine/datasets/tags/temperature) [viirs](https://developers.google.com/earth-engine/datasets/tags/viirs) [weather-and-climate](https://developers.google.com/earth-engine/datasets/tags/weather-and-climate) #### Description The NASA 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 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. Only observations having observation coverage more than a certain threshold (15%) are considered for this averaging. Documentation: - [User's Guide](https://lpdaac.usgs.gov/documents/429/VNP21_User_Guide_V1.pdf) - [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/1332/VNP21_ATBD_V1.pdf) - [General Documentation](https://lpdaac.usgs.gov/products/vnp21a1dv002/) - [Land Product Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/browse?sensor=VIIRS&sat=SNPP) ### Bands **Bands** Pixel size: 1000 meters (all bands) | Name | Units | Pixel Size | Description | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | `LST_1KM` | K | 1000 meters | Daily 1 km Land Surface Temperature. | | `QC` | | 1000 meters | Daily Quality control for LST and emissivity | | Bitmask for QC - Bits 0-1: Mandatory QA flags - 0: Pixel produced, good quality, no further QA info necessary - 1: Pixel produced but unreliable quality - 2: Pixel not produced due to cloud - 3: Pixel not produced due to reasons other than cloud - Bits 2-3: Data quality flag - 0: Good data quality of L1B bands 14, 15, 16 - 1: Missing pixel - 2: Fairly calibrated - 3: Poorly calibrated, TES processing skipped - Bits 4-5: Cloud Flag - 0: Cloud-free - 1: Thin cirrus - 2: Pixel within 2 pixels of nearest cloud - 3: Cloudy pixels - Bits 6-7: Iterations - 0: Slow convergence - 1: Nominal - 2: Nominal - 3: Fast - Bits 8-9: Atmospheric Opacity - 0: ≥3 (Warm, humid air; or cold land) - 1: 0.2 - 0.3 (Nominal value) - 2: 0.1 - 0.2 (Nominal value) - 3: \<0.1 (Dry, or high altitude pixel) - Bits 10-11: MMD - 0: \>0.15 (Most silicate rocks) - 1: 0.1 - 0.15 (Rocks, sand, some soils) - 2: 0.03 - 0.1 (Mostly soils, mixed pixel) - 3: \<0.03 (Vegetation, snow, water, ice, some soils) - Bits 12-13: Emissivity accuracy - 0: \>0.02 (Poor performance) - 1: 0.015 - 0.02 (Marginal performance) - 2: 0.01 - 0.015 (Good performance) - 3: \<0.01 (Excellent performance) - Bits 14-15: LST accuracy - 0: \>2K (Poor performance) - 1: 1.5 - 2K (Marginal performance) - 2: 1 - 1.5K (Good performance) - 3: \<1K (Excellent performance) |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| | `Emis_14` | | 1000 meters | Daily M14 emissivity | | `Emis_15` | | 1000 meters | Daily M15 emissivity | | `Emis_16` | | 1000 meters | Daily M16 emissivity | | `View_Angle` | deg | 1000 meters | View zenith angle of LST | | `View_Time` | h | 1000 meters | Time of LST observation | ### Terms of Use **Terms of Use** LP DAAC NASA data are freely accessible; however, when an author publishes these data or works based on the data, it is requested that the author cite the datasets within the text of the publication and include a reference to them in the reference list. ### Citations Citations: - Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data) for information on citing LP DAAC datasets. ### DOIs - ### Explore with Earth Engine > [!NOTE] > **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine) ### Code Editor (JavaScript) ```javascript var dataset = ee.ImageCollection('NASA/VIIRS/002/VNP21A1D') .filter(ee.Filter.date('2022-11-01', '2022-12-01')); var visualization = { bands: ['LST_1KM'], min: [150], max: [300], palette: [ 'a50026', 'd73027', 'f46d43', 'fdae61', 'fee08b', 'ffffbf', 'd9ef8b', 'a6d96a', '66bd63', '1a9850', '006837', ] }; Map.setCenter(41.2, 38.84, 3); Map.addLayer(dataset, visualization, 'LST'); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_VIIRS_002_VNP21A1D) [VNP21A1D.002: Day Land Surface Temperature and Emissivity Daily 1km](https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP21A1D) The NASA 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 swath granules onto a sinusoidal MODIS grid ... NASA/VIIRS/002/VNP21A1D, daily,day,land,nasa,noaa,surface,temperature,viirs,weather-and-climate 2012-01-19T00:00:00Z/2026-11-02T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.5067/VIIRS/VNP21A1D.002](https://doi.org/https://doi.org/10.5067/VIIRS/VNP21A1D.002) - [https://doi.org/10.5067/VIIRS/VNP21A1D.002](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP21A1D)