MOD21A1N_006

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

Version 006
  • Abstract
    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 (https://lpdaac.usgs.gov/sites/default/files/public/product_documentation/mod21_atbd.pdf).
  • Purpose
    Science Research
  • Version Description
    Collection Version 6 Processing and Reprocessing
  • DOI

    10.5067/MODIS/MOD21A1N.006

    https://dx.doi.org

Data Identification Fields:

Toggle Data Identification Fields
    Data Dates
    Creation
    Last Revision
    Processing Level

    2

    Sensor Measurements

    Quality
    Collection Progress

    In Work

    Access Constraints

    None

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • LAND SURFACE
    • SURFACE THERMAL PROPERTIES
    • LAND SURFACE TEMPERATURE
    • EARTH SCIENCE
    • LAND SURFACE
    • SURFACE RADIATIVE PROPERTIES
    • EMISSIVITY

Acquisition Information Fields:

Toggle Acquisition Information Fields
Platforms
  • Earth Observation Satellites
    TERRA
    Instruments
    • MODIS

Temporal Information Fields:

Toggle Temporal Information Fields

Spatial Information Fields:

Toggle Spatial Information Fields
    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL Universal Transverse Mercator (UTM) CARTESIAN GEODETIC
    Tiling Identification Systems
    System Name Coordinate 1 Min Coordinate 1 Max Coordinate 2 Min Coordinate 2 Max
    MODIS Tile SIN 0.0 35.0 0.0 17.0
Location Keywords

Data Centers

Toggle Data Centers
  • LP DAAC
    ARCHIVER
    Land Processes Distributed Active Archive Center

    U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center
    Sioux Falls, South Dakota 57198

    M-F, 8 a.m. to 4 p.m. Central Time
    • 605-594-6116
    • 605-594-6963
    • Email
    Contact Details

    None

  • NASA/GSFC/SED/ESD/HBSL/BISB/MODAPS
    Multiple Roles

    DISTRIBUTOR

    ORIGINATOR

    PROCESSOR

    MODIS Adaptive Processing System, Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    NASA/GSFC Code 922
    GREENBELT, Maryland 20771

    Contact Details

    Contact for data content concerns

Data Contacts

Toggle Data Contacts

There are no listed data contacts for this collection.

Collection Citations Fields:

Toggle Collection Citations Fields
    Collection Citations
    • Collection citation title not provided

      This data set was provided by the NASA EOS Project.