• The NSIDC DAAC is retiring access to its legacy, on-premises data archive and transitioning to the NASA Earthdata Cloud as the primary data archive. View planned retirement dates here.

Soil Moisture Active Passive Data (SMAP)

In this section

Documentation

ATBDs

Integrated SMAP and SMOS Soil Moisture Data ATBD, version 1
SPL1AP/BTB Algorithm Theoretical Basis Document [2016]
SPL1AP/BTB Algorithm Theoretical Basis Document [2018]
SPL1AP/SPL1BTB Algorithm Theoretical Basis Document [2021]
SPL1BS0/CS0 Algorithm Theoretical Basis Document [2012]
SPL1BTB Algorithm Theoretical Basis Document [2014]
SPL1BTB_E Algorithm Theoretical Basis Document [2016]
SPL1CTB Algorithm Theoretical Basis Document [2015]
SPL1CTB_E Algorithm Theoretical Basis Document [2018]
SPL2/3SMA Algorithm Theoretical Basis Document [2014]
SPL2/3SMA Algorithm Theoretical Basis Document [2015]
SPL2/3SMAP Algorithm Theoretical Basis Document [2014]
SPL2/3SMP Algorithm Theoretical Basis Document [2015]
SPL2/3SMP/_E Algorithm Theoretical Basis Document [2016]
SPL2/3SMP/_E Algorithm Theoretical Basis Document [2018]
SPL2/3SMP/_E Algorithm Theoretical Basis Document [2019]
SPL2/3SMP/_E Algorithm Theoretical Basis Document [2020]
SPL2/3SMP/_E Algorithm Theoretical Basis Document [2021]
SPL2SMAP_S Algorithm Theoretical Basis Document [2019]
SPL3FTA Algorithm Theoretical Basis Document [2014]
SPL3FTP/_E Algorithm Theoretical Basis Document [2016]
SPL3FTP/_E Algorithm Theoretical Basis Document [2018]
SPL3FTP/_E Algorithm Theoretical Basis Document [2020]
SPL4CMDL Algorithm Theoretical Basis Document [2014]
SPL4SMAU/SMGP/SMLM Algorithm Theoretical Basis Document [2014]

General Resources

Observation-Corrected Precipitation for SMAP L4 Soil Moisture Products (v.6) and the GEOS R21C Reanalysis
SMAP Ancillary Data Report: Crop Type [2013]
SMAP Ancillary Data Report: Digital Elevation Model [2013]
SMAP Ancillary Data Report: Landcover [2013]
SMAP Ancillary Data Report: Landcover Classification [2013]
SMAP Ancillary Data Report: Permanent Ice [2013]
SMAP Ancillary Data Report: Precipitation [2013]
SMAP Ancillary Data Report: Soil Attributes [2020]
SMAP Ancillary Data Report: Static Water Fraction [2013]
SMAP Ancillary Data Report: Surface Temperature [2015]
SMAP Ancillary Data Report: Urban Area [2013]
SMAP Ancillary Data Report: Vegetation Water Content [2013]
SMAP Ancillary File Read Me
SMAP Handbook [2014]
SMAP L4C Biome Properties Look-Up Table (BPLUT) Version 5 [2020]
SMAP L4C Biome Properties Look-Up Table (BPLUT) Version 6 [2021]
SMAP Post-Recovery Advisory Note 23 July 2019
SMAP Version History Workbook L1-L3 Products
SMAP Version History Workbook L4 Products
The SMAP and Copernicus Sentinel 1A/B microwave active-passive high resolution surface soil moisture product
The SMAP Level 4 Carbon Product for Monitoring Ecosystem Land–Atmosphere CO2 Exchange

Quality Assessment Reports

Assessment of the SMAP Level-4 Surface and Root-Zone Soil Moisture Product Using In Situ Measurements
Global Assessment of the SMAP Level-4 Surface and Root-Zone Soil Moisture Product Using Assimilation Diagnostics
SPL1B/CTB Assessment Report Version 1 [2015]
SPL1B/CTB Assessment Report Version 2 [2015]
SPL1B/CTB/_E Assessment Report Version 3 [2016]
SPL1B/CTB/_E Assessment Report Version 4 [2018]
SPL1B/CTB/_E Assessment Report Versions 5/5/3 [2020]
SPL2/3SMA Assessment Report Version 1 [2015]
SPL2/3SMA Assessment Report Version 4 [2017]
SPL2/3SMAP Assessment Report Version 1 [2015]
SPL2/3SMAP Assessment Report Version 2 [2016]
SPL2/3SMP Assessment Report Version 2 [2015]
SPL2/3SMP Assessment Report Version 3 [2016]
SPL2/3SMP/_E Assessment Report Version 4 [2017]
SPL2/3SMP/_E Assessment Report Version 5 [2018]
SPL2/3SMP/_E Assessment Report Version 6 [2019]
SPL2/3SMP/_E Assessment Report Versions 7/4 [2020]
SPL2/3SMP/_E Assessment Report Versions 8/5 [2021]
SPL2SMAP_S Assessment Report Version 1 [2017]
SPL2SMAP_S Assessment Report Version 2 [2019]
SPL2SMAP_S Assessment Report Version 3 [2020]
SPL3FTA Assessment Report Version 1 [2015]
SPL3FTA Assessment Report Version 3 [2016]
SPL3FTP/_E Assessment Report Version 1 [2016]
SPL3FTP/_E Assessment Report Version 2 [2018]
SPL3FTP/_E Assessment Report Version 3 [2020]
SPL4CMDL Assessment Report Version 1 [2015]
SPL4CMDL Assessment Report Version 2 [2016]
SPL4CMDL Assessment Report Version 3 [2018]
SPL4CMDL Assessment Report Version 5 [2021]
SPL4CMDL Assessment Report Version 6 [2022]
SPL4SMAU/SMGP/SMLM Assessment Report Version 1 [2015]
SPL4SMAU/SMGP/SMLM Assessment Report Version 2 [2016]
SPL4SMAU/SMGP/SMLM Assessment Report Version 3 [2018]
SPL4SMAU/SMGP/SMLM Assessment Report Version 5 [2021]
SPL4SMAU/SMGP/SMLM Assessment Report Version 6 [2022]
SPL4SMAU/SMGP/SMLM Assessment Report Version 7 [2023]

Product Specification Documents

SPL1AP Product Specification Document Version 1 [2015]
SPL1BTB Product Specification Document Version 1 [2015]
SPL1BTB Product Specification Document Version 2 [2016]
SPL1CTB Product Specification Document Version 1 [2015]
SPL1CTB Product Specification Document Version 4 [2018]
SPL1CTB Product Specification Document Version 5 [2020]
SPL1CTB_E Product Specification Document Version 1 [2016]
SPL1CTB_E Product Specification Document Version 2 [2018]
SPL1CTB_E Product Specification Document Version 3 [2020]
SPL2SMA Product Specification Document Version 1 [2014]
SPL2SMA Product Specification Document Version 2 [2016]
SPL2SMAP Product Specification Document Version 1 [2015]
SPL2SMAP_S Product Specification Document Version 1 [2017]
SPL2SMAP_S Product Specification Document Version 2 [2018]
SPL2SMAP_S Product Specification Document Version 3 [2020]
SPL2SMP Product Specification Document [2021]
SPL2SMP Product Specification Document Version 1 [2015]
SPL2SMP Product Specification Document Version 2 [2018]
SPL2SMP Product Specification Document Version 3 [2019]
SPL2SMP Product Specification Document Version 7 [2020]
SPL2SMP_E Product Specification Document [2021]
SPL2SMP_E Product Specification Document Version 1 [2016]
SPL2SMP_E Product Specification Document Version 2 [2018]
SPL2SMP_E Product Specification Document Version 3 [2019]
SPL2SMP_E Product Specification Document Version 4 [2020]
SPL3FTA Product Specification Document Version 1 [2015]
SPL3FTP Product Specification Document [2018]
SPL3FTP Product Specification Document Version 1 [2016]
SPL3FTP_E Product Specification Document [2018]
SPL3FTP_E Product Specification Document Version 1 [2016]
SPL3SMA Product Specification Document Version 1 [2014]
SPL3SMA Product Specification Document Version 2 [2016]
SPL3SMAP Product Specification Document Version 1 [2015]
SPL3SMP Product Specification Document [2021]
SPL3SMP Product Specification Document Version 1 [2015]
SPL3SMP Product Specification Document Version 2 [2018]
SPL3SMP Product Specification Document Version 3 [2019]
SPL3SMP Product Specification Document Version 7 [2020]
SPL3SMP_E Product Specification Document [2021]
SPL3SMP_E Product Specification Document Version 1 [2016]
SPL3SMP_E Product Specification Document Version 2 [2018]
SPL3SMP_E Product Specification Document Version 3 [2019]
SPL3SMP_E Product Specification Document Version 4 [2020]
SPL4CMDL Product Specification Document Version 2 [2016]
SPL4CMDL Product Specification Document Version 2.1 [2021]
SPL4CMDL Product Specification Document Version 7 [2022]
SPL4SMAU/SMGP/SMLM Product Specification Document Version 1 [2015]
SPL4SMAU/SMGP/SMLM Product Specification Document Version 2 [2018]
SPL4SMAU/SMGP/SMLM Product Specification Document Version 7 [2022]
SPL4SMAU/SMGP/SMLM Product Specification Document Version 8 [2025]

Validation Campaign Documents

CLASIC07 Science and Implementation Plan
SMAPVEX08 Experiment Plan
SMAPVEX12 Database Report
SMAPVEX12 Experiment Plan
SMAPVEX16 Manitoba Experiment Plan
SV15M Crop LAI Product Specifications
SV16M Crop Density Product Specifications
SV16M Crop Height Product Specifications
SV16M CropScan Product Specifications
SV16M ECCC Radiometer Angular Product Specifications
SV16M ECCC Radiometer Continuous Product Specifications
SV16M MA Weather Station Product Specifications
SV16M POGO Soil Moisture Product Specifications
SV16M RISM Soil Station Product Specifications
SV16M Soil and Crop Temperature Product Specifications
SV16M Soil Properties Product Specifications
SV16M Soil Roughness Product Specifications
SV16M Temporary Soil Moisture Station Product Specifications
SV16M US Radiometer Angular Product Specifications
SV16M US Radiometer Continuous Product Specifications
SV16M Volumetric Soil Moisture Product Specifications