MODIS/Terra Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Night V006

Metadata Updated: March 22, 2019

MODIS/Terra Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Night (MOD21A1N.006).

A new suite of MODIS Land Surface Temperature (LST) and Emissivity products are available in Collection 6. The MOD21 LST algorithm differs from the algorithm of the MOD11 LST products, in that the MOD21 algorithm is based on the ASTER Temperature Emissivity Separation (TES) technique, whereas the MOD11 uses the split-window technique. The MOD21 TES algorithm uses a physics-based algorithm to retrieve dynamically both the LST and Emissivity simultaneously from the three MODIS thermal infrared bands 29, 31, and 32. The TES algorithm is combined with an improved Water Vapor Scaling (WVS) atmospheric correction scheme to stabilize the retrieval during very warm and humid conditions.

The MOD21A1N dataset is produced daily from nightttime Level 2 Gridded (L2G) intermediate LST products. 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 all 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 and emissivity 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 MOD21A1N product contains seven Science Datasets (SDS), which include the calculated LST as well as quality control, the three emissivity bands, view zenith angle, and time of observation. Additional details regarding the methodology used to create this Level 3 (L3) product are available in the Algorithm Theoretical Basis Document (


The Terra MODIS LST product suite (MOD21) for the 2000 through 2005 time period are being released to the public with a provisional maturity status, as these products may have been negatively impacted by an optical crosstalk issue in the IR bands (B27 - B30). Although the crosstalk issue was present from the beginning of the mission, the impact on the product is not significant until after 2005. Thus, the Terra LST products are not being produced beyond 2005. The Aqua MODIS data are not affected by this crosstalk issue and the MYD21 LST products are considered to be science quality data with a stage 1 validation status. Additional information is available on the MODIS Land Quality Assessment website (

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date August 1, 2018
Metadata Updated Date March 22, 2019

Metadata Source

Harvested from NASA Data.json

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Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date March 22, 2019
Publisher LP DAAC
Unique Identifier C1000000521-LPDAAC_ECS
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation Archived by National Aeronautics and Space Administration, U.S. Government, LP DAAC. This data set was provided by the NASA EOS Project..
Graphic Preview Description Browse image for Earthdata Search
Graphic Preview File
Harvest Object Id 66b9a6ef-c355-402a-832f-f09ea2ac38fb
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2016-01-20
Homepage URL
Language en-US
Metadata Type geospatial
Data Last Modified 2016-01-20
Program Code 026:001
Source Datajson Identifier True
Source Hash 84b8e33380b3524637f027969f13ac8530a567bc
Source Schema Version 1.1
Spatial -180.0 -90.0 180.0 90.0
Temporal 1999-12-18T00:00:00Z/2019-03-14T00:00:00Z
Category Terra, geospatial

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