Bolten, J., V. Lakshmi, and E. Njoku. 2003. Soil moisture retrieval using the passive/active L- and S-band radar/radiometer. IEEE Trans. Geosci. Rem. Sens., 41:2792-2801.
Brodzik, M. J., B. Billingsley, T. Haran, B. Raup, and M. H. Savoie. 2012. EASE-Grid 2.0: Incremental but significant improvements for Earth-gridded data sets. ISPRS Int. J. Geo-Inf. 1(1):32-45. http://dx.doi.org/10.3390/ijgi1010032.
Brodzik, M. J., B. Billingsley, T. Haran, B. Raup, and M. H. Savoie. 2014. Correction: Brodzik, M. J. et al. EASE-Grid 2.0: Incremental but significant improvements for Earth-gridded data sets. ISPRS Int. J. Geo-Inf 2012. 1(1):32-45 ISPRS Int. J. Geo-Inf. 3(3):1154-1156. http://dx.doi.org/10.3390/ijgi3031154.
Das, N. N., D. Entekhabi, S. Dunbar, E. G. Njoku, and S. Yueh. 2016. Uncertainty estimates in the SMAP combined active-passive downscaled brightness temperature. IEEE Transactions on Geoscience and Remote Sensing. 54(2):640-650,
http://dx.doi.org/10.1109/TGRS.2015.2450694.
Das, N. N., and R. S. Dunbar. 2015. SMAP Level 2 Active/Passive Soil Moisture (L2_SM_AP) Product Specification Document. SMAP Project, JPL D-72548, Jet Propulsion Laboratory, Pasadena, CA. (SMAP L2_SM_AP PSD_10312015.pdf, 3 MB)
Das, N. N., and R. S. Dunbar. 2017. Level 2 SMAP/Sentinel Active/Passive Soil Moisture Product Specification Document. SMAP Project, JPL D-56548, Jet Propulsion Laboratory, Pasadena, CA. (SMAP L2_SM_SP PSD_11-01-2017_latest.pdf , 1.02 MB)
Das, N. N., D. Entekhabi, E. G. Njoku, J. Johnston, J. C. Shi, and A. Colliander. 2014. Tests of the SMAP combined radar and radiometer brightness temperature disaggregation algorithm using airborne field campaign observations. IEEE-TGARS. 52:2018–2028.
Das, N. N., D. Entekhabi, and E. G. Njoku, 2011. An algorithm for merging SMAP radiometer and radar data for high resolution soil moisture retrieval. IEEE-TGARS. 9: 1504-1512.
Das, N. N., et al. 2015. Soil Moisture Active Passive (SMAP) project calibration and validation for the L2/3_SM_AP beta-release data products. SMAP Project, JPL D-93984. Jet Propulsion Laboratory, Pasadena, CA. (SMAP-AP_Assessment_Report_Final.pdf, 4 MB)
Das, N. N., D. Entekhabi, S. Dunbar, S. Kim, S. Yueh, A. Colliander, T. J. Jackson, P. E. O’Neill, M. Cosh, T. Caldwell, J. Walker, A. Berg, T. Rowlandson, J. Martínez-Fernández, Á. González-Zamora, P. Starks, C. Holifield-Collins, J. Prueger, and E. Lopez-Baeza. 2017. Calibration and validation for the L2_SM_SP beta release data products, SMAP Project, JPL D-56549, Jet Propulsion Laboratory, Pasadena, CA. (SMAPSPBetaReleaseAssessmentReport_11-01-2017_final.pdf, 6.3 MB)
Entekhabi, D. et al. 2014. SMAP Handbook–Soil Moisture Active Passive: Mapping soil moisture and freeze/thaw from space. Pasadena, CA USA: SMAP Project, JPL CL#14-2285, Jet Propulsion Laboratory.
Entekhabi, D., N. Das, E. Njoku, J. Johnson, and J. Shi. 2014. SMAP Algorithm Theoretical Basis Document: L2 & L3 radar/radiometer soil moisture (active/passive) data products. SMAP Project, JPL D-66481. Jet Propulsion Laboratory, Pasadena, CA. (277_L2_3_SM_AP_RevA_web.pdf, 16.6 MB)
Jagdhuber, T., M. Bauer, M. Link, N. N. Das, and D. Entekhabi. 2017. Retrieval of active-passive microwave covariation using the SMAP and Sentinel-1 Data. IEEE Transactions on Geoscience and Remote Sensing, submitted.
Technical References
For a list of all SMAP technical references, such as ATBDs, calibration and validation reports, and product specification documents, see the SMAP Technical References page.