SMAP Level-4 Products

Documentation

  • Overview Articles:

    Reichle, R. H., and Coauthors (2021), The Contributions of Gauge-Based Precipitation and SMAP Brightness Temperature Observations to the Skill of the SMAP Level-4 Soil Moisture Product, Journal of Hydrometeorology, 22, 405-424, doi:10.1175/JHM-D-20-0217.1.

    Reichle, R. H., and Coauthors (2019), Version 4 of the SMAP Level-4 Soil Moisture Algorithm and Data Product. J. Adv. Model. Earth Sys., doi:10.1029/2019MS001729.

    Reichle, R. H., and Coauthors (2017), Assessment of the SMAP Level-4 Surface and Root-Zone Soil Moisture Product Using In Situ Measurements, Journal of Hydrometeorology, 18, 2621-2645, doi:10.1175/JHM-D-17-0063.1.

    Reichle, R. H., and Coauthors (2017), Global Assessment of the SMAP Level-4 Surface and Root-Zone Soil Moisture Product Using Assimilation Diagnostics, Journal of Hydrometeorology, 18, 3217-3237, doi:10.1175/JHM-D-17-0130.1

    Jones, L. A., J. S. Kimball, R. H. Reichle, N.Madani, J. Glassy, J. V. Ardizzone, A. Colliander, J. Cleverly, D. Eamus, E. Euskirchen, L. Hutley, C. Macfarlane, and R. Scott, 2017. The SMAP Level 4 Carbon Product for Monitoring Ecosystem Land-Atmosphere CO2 Exchange. IEEE Transactions on Geoscience and Remote Sensing, 55, 11, 6517-6532. doi:10.1109/TGRS.2017.2729343.
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  • The following Algorithm Theoretical Basis Documents provide an overview of the SMAP Level-4 science algorithms.
  • The following File Specification Documents provide comprehensive explanations of the available SMAP Level-4 datasets and of their grid structure, file format, and metadata.

    L4
    Version    		 Product Specification Document
    L4_SM: GMAO Office Note #10 L4_C: GMAO Office Note #11
    Version 1 Version 1.4 (10/31/2015) Version 1.9 (10/31/2015)
    Version 2 Version 2.0 (4/29/2016)
    Version 3
    Version 4 Version 1.5 (6/14/2018)
    Version 5
    Version 6 Version 2.1 (11/15/2021)
  • The following Assessment Reports summarize the scientific performance of the SMAP Level-4 datasets.

    L4
    Version    		 Assessment Report
    L4_SM L4_C
    Version 1 Tech Memo #40 Tech Memo #42
    Version 2 Office Note #12 Office Note #13
    Version 3 Tech Memo #52 No published reports are available for Versions 3 and 4.
    Refer instead to Tech Memo #56
    Version 4
    Version 5 Tech Memo #58 Tech Memo #56
    Version 6 Tech Memo #60 TBD