MODIS/Aqua Land Surface Temperature/3-Band Emissivity 5-Min L2 1km V061

Description

The MYD21 Version 6.1 Land Surface Temperature and Emissivity (LST&E) swath data product is produced daily in five minute temporal increments of satellite acquisition. The swath is approximately 2,030 pixels along track and 1,354 pixels per line, at a nadir resolution of 1,000 meters. The MYD21 Land Surface Temperature (LST) algorithm differs from the MYD11 (https://doi.org/10.5067/modis/myd11_l2.061) algorithm in that the MYD21 LST algorithm is based on the ASTER Temperature/Emissivity Separation (TES) technique, whereas the MYD11 uses the split-window technique. The MYD21 TES algorithm uses a physics-based algorithm to dynamically retrieve both LST and spectral emissivity simultaneously from the 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. Additional details regarding the method used to create this Level 2 (L2) product are available in the Algorithm Theoretical Basis Document (ATBD (https://lpdaac.usgs.gov/documents/1399/MOD21_ATBD.pdf)). Validation at stage 1 (https://modis-land.gsfc.nasa.gov/MODLAND_val.html) has been achieved for the MODIS Land Surface Temperature and Emissivity data products. Further details regarding MODIS land product validation for the MYD21 data products are available from the MODIS Land Team Validation site (https://modis-land.gsfc.nasa.gov/ValStatus.php?ProductID=MOD21). Improvements/Changes from Previous Versions * The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 - 2017. * A polarization correction has been applied to the L1B Reflective Solar Bands (RSB). * The product utilizes GEOS data replacing MERRA2. * Three new CMG products are available in the MxD21 suite (MxD21C1/C2/C3).

Resources

Name Format Description Link
21 Access data via Open-source Project for a Network Data Access Protocol https://opendap.cr.usgs.gov/opendap/hyrax/DP131/MOLA/MYD21.061/contents.html
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FMODIS%2FMYD21.061
33 The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products. https://lpdaac.usgs.gov/documents/1399/MOD21_ATBD.pdf
21 The LP DAAC product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc. https://doi.org/10.5067/MODIS/MYD21.061
21 The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products. https://lpdaac.usgs.gov/
33 The technical information in the User's Guide enables users to interpret and use the data products. https://lpdaac.usgs.gov/documents/1398/MOD21_User_Guide_V61.pdf
21 The File Specification provides a description of the product file including Scientific Data Sets and their attributes. https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/6/MYD21
21 Browse image for Earthdata Search https://cmr.earthdata.nasa.gov/browse-scaler/browse_images/granules/G2689865792-LPCLOUD?h=85&w=85
20 Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data. https://search.earthdata.nasa.gov/search?q=C2565805776-LPCLOUD
20 LP DAAC Data Pool provides direct access to available products via HTTPS. https://e4ftl01.cr.usgs.gov/MOLA/MYD21.061/
21 Validation at stage 1 has been achieved for the MODIS Land Surface Temperature and Emissivity data products. https://modis-land.gsfc.nasa.gov/MODLAND_val.html
21 Further details regarding MODIS land product validation for the MYD21 data products are available from the MODIS Land Team Validation site. https://modis-land.gsfc.nasa.gov/ValStatus.php?ProductID=MOD21

Tags

  • land-surface
  • national-geospatial-data-asset
  • ngda
  • surface-radiative-properties
  • surface-thermal-properties
  • earth-science

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Categories