Results 41 to 50 of about 4,460 (223)

Spatially Interpolated CYGNSS Data Improve Downscaled 3 km SMAP/CYGNSS Soil Moisture

Remote Sensing
Soil moisture data with both a fine spatial scale and a short global repeat period would benefit many hydrologic and climatic applications. Since the radar transmitter malfunctioned on NASA’s Soil Moisture Active Passive (SMAP) in 2015, SMAP soil ...
Liza J. Wernicke, Clara C. Chew, Eric E. Small   +2 more
doaj   +1 more source

Seasonal Dependence of SMAP Radiometer-Based Soil Moisture Performance as Observed over Core Validation Sites [PDF]

, 2019
The NASA SMAP (Soil Moisture Active Passive) mission provides a global coverage of soil moisture measurements based on its L-band microwave radiometer every 2-3 days at about 40 km resolution.
Asanuma, J., Berg, A., Bindlish, R., Bosch, D. D., Caldwell, T., Chan, S. K., Colliander, A., Cosh, M. H., Holifield Collins, C., Jackson, T. J., Jensen, K. H., Martinez-Fernandez, J., McNairn, H., O'Neill, P., Prueger, J. H., Seyfried, M. S., Starks, P. J., Su, Z., Thibeault, M., Walker, J. P., Yueh, S. H.   +20 more
core   +2 more sources

Understanding the Influence of Soil Moisture on Machine Learning Predictions of Photosynthesis and Evapotranspiration

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract Evapotranspiration (ET) and photosynthesis are key processes in ecosystem functioning on which soil moisture (SM) has an important influence. Eddy covariance measurements and machine learning (ML) increasingly enable flux prediction in ungauged regions.
Daniel Power, Miguel Angel Rico‐Ramirez, Pierre Gentine, David McJannet, Martin Schrön, Corinna Rebmann, Humberto da Rocha, Rafael Rosolem   +7 more
wiley   +1 more source

Preliminary Evaluation of the SMAP Radiometer Soil Moisture Product over China Using In Situ Data

Remote Sensing, 2017
The Soil Moisture Active Passive (SMAP) satellite makes coincident global measurements of soil moisture using an L-band radar instrument and an L-band radiometer.
Yayong Sun, Shifeng Huang, Jianwei Ma, Jiren Li, Xiaotao Li, Hui Wang, Sheng Chen, Wenbin Zang   +7 more
doaj   +1 more source

An initial assessment of SMAP soil moisture retrievals using high-resolution model simulations and in situ observations [PDF]

, 2016
At the end of its first year of operation, we compare soil moisture retrievals from the Soil Moisture Active Passive (SMAP) mission to simulations from a land surface model with meteorological forcing downscaled from observations/reanalysis and in situ ...
Bell, Chan, Chen, Cosgrove, Dara Entekhabi, Entekhabi, Eric F. Wood, Jackson, Kerr, Liang, Liang, Ming Pan, Mitchell, Nathaniel W. Chaney, Njoku, Owe, Pan, Pan, Piepmeier, Reichle, Schaefer, Schmugge, Sheffield, Troy, Wagner, Wagner, Wigneron, Wood, Xia, Xitian Cai   +29 more
core   +1 more source

Radio-frequency interference (RFI) mitigation for the soil moisture active/passive (SMAP) radiometer [PDF]

2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
The presence of anthropogenic RFI is expected to adversely impact soil moisture measurement by NASA's Soil Moisture Active Passive mission. The digital signal processing approach and preliminary design for detecting and mitigating this RFI is presented in this paper. This approach is largely based upon the work of Johnson [1] and Ruf [2].
Damon Bradley, Cliff Brambora, Mark Englin Wong, Lynn Miles, David Durachka, Brian Farmer, Priscilla Mohammed, Jeff Piepmier, Jim Medeiros, Neil Martin, Rafael Garcia   +10 more
openaire   +1 more source

Observation and Coordination Needs for Current, Near‐Future, and Next Generation Earth‐Observing SAR Systems

Earth and Space Science, Volume 13, Issue 5, May 2026.
Abstract This paper summarizes an evaluation by experts of how coordination of Earth‐observing Synthetic Aperture Radar (SAR) missions among the world's space agencies could advance toward game‐changing scientific discoveries and fully realizing SAR's practical capability to address many issues facing society.
Cathleen E. Jones, Ake Rosenqvist, Björn Rommen, Magdalena Fitrzyk, Eric Rignot, Bernd Scheuchl, Yujie Zheng, Andrew Hooper, Mark Simons, Tomokazu Kobayashi, Paul Siqueira, Maurizio Santoro, Takeo Tadono, Laura Hess, Heather McNairn, Laura Frulla, Malin Johansson, Wolfgang Dierking, Line Rouyet, Annett Bartsch, Paco Lopez Dekker, Johnny A. Johannessen   +21 more
wiley   +1 more source

The Soil Moisture Active Passive Experiments: Validation of the SMAP Products in Australia

IEEE Transactions on Geoscience and Remote Sensing, 2021
The fourth and fifth Soil Moisture Active Passive Experiments (SMAPEx-4 and -5) were conducted at the beginning of the SMAP operational phase, May and September 2015, to: 1) evaluate the SMAP microwave observations and derived soil moisture (SM) products and 2) intercompare with the Soil Moisture and Ocean Salinity (SMOS) and Aquarius missions over the
Nan Ye, Jeffrey P. Walker, Xiaoling Wu, Richard de Jeu, Ying Gao, Thomas J. Jackson, Francois Jonard, Edward Kim, Olivier Merlin, Valentijn R. N. Pauwels, Luigi J. Renzullo, Christoph Rudiger, Sabah Sabaghy, Christian von Hebel, Simon H. Yueh, Liujun Zhu   +15 more
openaire   +5 more sources

Tracking Water Dynamics of a Temperate Forest Under Drought and Non‐Drought Conditions Using Active and Passive Microwave and Optical Remote Sensing

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Water status, water dynamics, and ecohydrological resilience of a protected German beech forest during the 2018–2020 multi‐year drought are assessed using over six years of multi‐frequency remote sensing data, integrating active, passive, and optical sensors with varying canopy penetration depths, highlighting the importance of monitoring ...
Florian M. Hellwig, Anke Fluhrer, Clémence Dubois, Konstantin Schellenberg, David Chaparro, Markus Zehner, Anne Klosterhalfen, María Piles, Christiane Schmullius, Harald Kunstmann, Thomas Jagdhuber   +10 more
wiley   +1 more source

The NASA Soil Moisture Active Passive (SMAP) Mission: Overview [PDF]

, 2011
The Soil Moisture Active Passive (SMAP) mission is one of the first Earth observation satellites being developed by NASA in response to the National Research Council?s Decadal Survey [1].
Entekhabi, Dara, Kellogg, Kent, Njoku, Eni, O'Neill, Peggy   +3 more
core   +1 more source