Results 51 to 60 of about 5,604,864 (173)

Temporal stability of soil moisture and radar backscatter observed by the advanced Synthetic Aperture Radar (ASAR) [PDF]

, 2008
The high spatio-temporal variability of soil moisture is the result of atmospheric forcing and redistribution processes related to terrain, soil, and vegetation characteristics.
Annett Bartsch, Doubkova, Marcela, Bartsch, Annett, Pathe, Carsten, Scipal, K., Klaus Scipal, Günter Blöschl, Bloschl, G., Martinez-Fernandez, J., Pathe, C., Wolfgang Wagner, Alexander Löw, Scipal, Klaus, Hasenauer, Stefan, Doubkova, M., Bloschl, Guenter, Bartsch, A., José Martínez-Fernández, Sabel, Daniel, Löw, Alexander, Stefan Hasenauer, Loew, A., Daniel Sabel, Marcela Doubkova, Hasenauer, S., Wagner, W., Carsten Pathe, Martinez-Fernandez, Jose, José Martínez-Fernández, Wagner, Wolfgang, Günter Blöschl, Sabel, D., Alexander Löw   +32 more
core   +1 more source

Evaluation of SMOS, SMAP, AMSR2 and FY-3C soil moisture products over China.

PLoS ONE, 2022
Microwave remote sensing can provide long-term near-surface soil moisture data on regional and global scales. Conducting standardized authenticity tests is critical to the effective use of observed data products in models, data assimilation, and various ...
Jiazhi Fan, Man Luo, Qinzhe Han, Fulai Liu, Wanhua Huang, Shiqi Tan   +5 more
doaj   +1 more source

minimizing estimation error variance using a weighted sum of samples from the soil moisture active passive (SMAP) satellite [PDF]

, 2023
The National Aeronautics and Space Administration's (NASA) Soil Moisture Active Passive (SMAP) is the latest passive remote sensing satellite operating in the protected L-band spectrum from 1.400 to 1.427 GHz.
Koosha, Mohammad, Mastronarde, Nicholas
core   +1 more source

Fostering Application Opportunites for the NASA Soil Moisture Active Passive (SMAP) Mission [PDF]

, 2010
The NASA Soil Moisture Active Passive (SMAP) Mission will provide global observations of soil moisture and freeze/thaw state from space. We outline how priority applications contributed to the SMAP mission measurement requirements and how the SMAP ...
Moran, M. Susan, O'Neill, Peggy E., Kellogg, Kent H., Entekhabi, Dara, Njoku, Eni G.   +4 more
core  

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].
O'Neill, Peggy, Njoku, Eni, Kellogg, Kent, Entekhabi, Dara   +3 more
core  

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

, 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
Ye, N., Ye, Nan, Merlin, O., Zhu, Liujun, Walker, J. P., Gao, Y., Sabaghy, S., Zhu, L., Rudiger, C., Pauwels, V. R. N., Walker, Jeffrey P., De Jeu, R., Kim, E., Yueh, S. H., Wu, Xiaoling, de Jeu, Richard, Jonard, François, de Jeu Richard, A.M., von Hebel, Christian, Jackson, Thomas J., Merlin, Olivier, Renzullo, L. J., Kim, Edward, Renzullo, Luigi J., Yueh, Simon H., Pauwels, Valentijn, R. N., Gao, Ying, Wu, X., Pauwels, Valentijn R. N., Von Hebel, C., Rudiger, Christoph, Sabaghy, Sabah, Jackson, T. J.   +32 more
core   +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

Spatial downscaling of SMAP radiometer soil moisture using radar data: Application of machine learning to the SMAPEx and SMAPVEX campaigns

Science of Remote Sensing
This study developed a random forest approach for downscaling the coarse-resolution (36 km) soil moisture measured by The National Aeronautics and Space Administration (NASA) Soil Moisture Active Passive (SMAP) mission to 1 km spatial resolution ...
Elaheh Ghafari, Jeffrey P. Walker, Liujun Zhu, Andreas Colliander, Alireza Faridhosseini   +4 more
doaj   +1 more source

Reconstruction of a Global 9 km, 8-Day SMAP Surface Soil Moisture Dataset during 2015–2020 by Spatiotemporal Fusion

Journal of Remote Sensing, 2022
Soil moisture, a crucial property for Earth surface research, has been focused widely in various studies. The Soil Moisture Active Passive (SMAP) global products at 36 km and 9 km (called P36 and AP9 in this research) have been published from April 2015.
Haoxuan Yang, Qunming Wang, Wei Zhao, Xiaohua Tong, Peter M. Atkinson   +4 more
doaj   +1 more source

Enhancing the Spatial Applicability of SMAP Soil Moisture Using Multi-Stage Machine Learning Downscaling

Remote Sensing
The Soil Moisture Active Passive (SMAP) mission provides global soil moisture (SM) observations with high temporal frequency and broad spatial coverage, valuable for hydrological and agricultural applications.
Jeonghwan Park, Jisung Geba Chang
doaj   +1 more source