Short Name:

MODIS/Terra Land Surface Temperature/3-Band Emissivity 8-Day L3 Global 1km SIN Grid V006

MODIS/Terra Land Surface Temperature/3-Band Emissivity 8-Day L3 Global 1km SIN Grid (MOD21A2.006). 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 MOD21A2 dataset is an 8-day composite LST product that uses an algorithm based on a simple-averaging method. The algorithm calculates the average from all the cloud free MOD21A1D and MOD21A1N daily acquisitions from the 8-day period. Unlike the MOD21A1 data sets where the daytime and nighttime acquisitions are separate products, the MOD21A2 contains both daytime and nighttime acquisitions as separate science dataset (SDS) layers within a single Hierarchical Data Format (HDF) file. The LST, Quality Control (QC), View zenith angle, and Viewing time have separate day and night SDS layers, while the values for the MODIS emissivity bands 29, 31, and 32 are the average of both the nighttime and daytime acquisitions. Additional details regarding the method used to create this Level 3 (L3) product are available in the Algorithm Theoretical Basis Document ( Notification 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 (

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