![MODIS/061/MOD21A1D](https://developers.google.com/earth-engine/datasets/images/MODIS/MODIS_061_MOD21A1D_sample.png) Dataset Availability : 2000-02-24T00:00:00Z--2026-11-08T00:00:00Z Dataset Producer : [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MOD21A1D.061) Cadence : 1 Day Tags : [daily](https://developers.google.com/earth-engine/datasets/tags/daily.md.txt) [emissivity](https://developers.google.com/earth-engine/datasets/tags/emissivity.md.txt) [global](https://developers.google.com/earth-engine/datasets/tags/global.md.txt) [lst](https://developers.google.com/earth-engine/datasets/tags/lst.md.txt) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa.md.txt) [surface-temperature](https://developers.google.com/earth-engine/datasets/tags/surface-temperature.md.txt) [terra](https://developers.google.com/earth-engine/datasets/tags/terra.md.txt) [usgs](https://developers.google.com/earth-engine/datasets/tags/usgs.md.txt) [weather-and-climate](https://developers.google.com/earth-engine/datasets/tags/weather-and-climate.md.txt) #### Description The MOD21A1D dataset is produced daily from daytime Level 2 Gridded (L2G) intermediate LST products at a spatial resolution of 1,000 meters. The L2G process maps the daily MOD21 swath granules onto a sinusoidal MODIS grid and stores all observations falling over a gridded cell for a given day. The MOD21A1 algorithm sorts through these observations for each cell and estimates the final LST value as an average from all observations that are cloud free and have good LST\&E accuracies. The daytime average is weighted by the observation coverage for that cell. Only observations having an observation coverage greater than a 15% threshold are considered. The MOD21A1D product contains the calculated LST as well as quality control, the three emissivity bands, view zenith angle, and time of observation. Note that scale factors and offsets described in the MODIS documentation for MOD21A1D bands are already applied to assets ingested into Earth Engine. Documentation: - [User's Guide](https://lpdaac.usgs.gov/documents/1398/MOD21_User_Guide_V61.pdf) - [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/1399/MOD21_ATBD.pdf) - [General Documentation](https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/61/MOD21A1D) ### Bands **Bands** Pixel size: 1000 meters (all bands) | Name | Units | Min | Max | Pixel Size | Description | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | `LST_1KM` | K | 7500 | 65535 | 1000 meters | Land Surface Temperature | | `QC` | | | | 1000 meters | Quality Control | | Bitmask for QC - Bits 0-1: Mandatory QA flags - 0: Pixel produced, good quality, no further QA info necessary - 1: Pixel produced, nominal 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 29, 31, 32 - 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 pixel - Bits 6-7: TES Iterations - 0: =7 (Slow convergence) - 1: 6 (Nominal) - 2: 5 (Nominal) - 3: \<5 (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: Min-Max Difference(MMD). Difference between minimum and maximum emissivity for bands 29, 31, 32 - 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) - 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: 2 K (Poor performance) - 1: 1.5 - 2 K (Marginal performance) - 2: 1 - 1.5 K (Good performance) - 3: \<1 K (Excellent performance) |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| | `Emis_29` | | 0 | 255 | 1000 meters | Band 29 emissivity | | `Emis_31` | | 1 | 255 | 1000 meters | Band 31 emissivity | | `Emis_32` | | 1 | 255 | 1000 meters | Band 32 emissivity | | `View_Angle` | deg | 0 | 130 | 1000 meters | MODIS view zenith angle | | `View_Time` | h | 0 | 240 | 1000 meters | Time of MODIS observation | ### Terms of Use **Terms of Use** MODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution. ### 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('MODIS/061/MOD21A1D') .filter(ee.Filter.date('2018-01-01', '2018-05-01')); var landSurfaceTemperature = dataset.select('LST_1KM'); var landSurfaceTemperatureVis = { min: 216.0, max: 348.0, palette: [ '040274', '040281', '0502a3', '0502b8', '0502ce', '0502e6', '0602ff', '235cb1', '307ef3', '269db1', '30c8e2', '32d3ef', '3be285', '3ff38f', '86e26f', '3ae237', 'b5e22e', 'd6e21f', 'fff705', 'ffd611', 'ffb613', 'ff8b13', 'ff6e08', 'ff500d', 'ff0000', 'de0101', 'c21301', 'a71001', '911003' ], }; Map.setCenter(6.746, 46.529, 2); Map.addLayer( landSurfaceTemperature, landSurfaceTemperatureVis, 'Land Surface Temperature'); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MOD21A1D) [MOD21A1D.061 Terra Land Surface Temperature and 3-Band Emissivity Daily Global 1km](https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD21A1D.md.txt) The MOD21A1D dataset is produced daily from daytime Level 2 Gridded (L2G) intermediate LST products at a spatial resolution of 1,000 meters. The L2G process maps the daily MOD21 swath granules onto a sinusoidal MODIS grid and stores all observations falling over a gridded cell for a given day. The ... MODIS/061/MOD21A1D, daily,emissivity,global,lst,nasa,surface-temperature,terra,usgs,weather-and-climate 2000-02-24T00:00:00Z/2026-11-08T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.5067/MODIS/MOD21A1D.061](https://doi.org/https://doi.org/10.5067/MODIS/MOD21A1D.061) - [https://doi.org/10.5067/MODIS/MOD21A1D.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD21A1D)