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Thomas J. Jackson
Agricultural Research Service
465Publications
73H-index
20.3kCitations
Publications 477
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#1Gurjeet Singh (IIT BBS: Indian Institute of Technology Bhubaneswar)H-Index: 2
#2Narendra N. Das (California Institute of Technology)H-Index: 18
Last.Simon Yueh (California Institute of Technology)H-Index: 36
view all 8 authors...
The Soil Moisture Active Passive (SMAP) mission currently provides three surface soil moisture products based solely on instrument measurements. The three soil moisture products are: 1) the radiometer-only 36 km gridded; 2) a radiometer-only enhanced product gridded at 9 km; and 3) a high-resolution (3 km) SMAP-Sentinel active–passive product. It is important to validate these released SMAP soil moisture products over various land covers and hydroclimatic domains before they are routinely used i...
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#1Rogier van der Velde (Water Resources University)
#2Andreas Colliander (California Institute of Technology)H-Index: 23
Last.Zhongbo Su (Water Resources University)H-Index: 41
view all 10 authors...
Abstract. The Twente region in the east of the Netherlands has a network with twenty soil monitoring stations that has been utilized for validation of the Soil Moisture Active/Passive (SMAP) passive-only soil moisture products. Over the period from April 2015 until December 2018, seven stations covered by the SMAP reference pixels have fairly complete data records. Spatially distributed soil moisture simulations with the Dutch national hydrological model have been utilized for the development of...
1 CitationsSource
#1Bin Fang (UVA: University of Virginia)H-Index: 9
#2Venkat Lakshmi (UVA: University of Virginia)H-Index: 1
Last.Andreas Colliander (California Institute of Technology)H-Index: 23
view all 5 authors...
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#1Bin Fang (UVA: University of Virginia)H-Index: 9
#2Venkat Lakshmi (UVA: University of Virginia)H-Index: 1
Last.Andreas Colliander (California Institute of Technology)H-Index: 23
view all 5 authors...
Abstract The SMAPVEX12 (Soil Moisture Active Passive (SMAP) Validation Experiment 2012) experiment was conducted during June-July 2012 in Manitoba, Canada with the goal of collecting remote sensing data and ground measurements for the development and testing of soil moisture retrieval algorithms under varying vegetation and soil conditions for the SMAP satellite. The aircraft based soil moisture data provided by the passive/active microwave sensor PALS (Passive and Active L-band System) has a no...
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Soil Moisture Active Passive (SMAP) mission and the Soil Moisture and Ocean Salinity (SMOS) missions provide brightness temperature and soil moisture estimates every 2-3 days. SMAP brightness temperature observations were compared with SMOS observations at 40° incidence angle. The brightness temperatures from the two missions are close to each other but SMAP observations show a warmer TB bias (about 0.64 K: V pol and 1.14 K: H pol) as compared to SMOS. SMAP and SMOS missions use different retrie...
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The SMAP (Soil Moisture Active/Passive) satellite provides global soil moisture (SM) estimates that can be used for scientific research and applications (such as the hydrological cycle, agriculture, ecology, and land atmosphere interactions). Currently, SMAP provides the enhanced radiometer-only SM product (L2SMP) at 9 km grid resolution. However, this spatial resolution is still not enough to satisfy the needs of some studies that require a finer spatial resolution SM product, particularly in a...
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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. The soil moisture retrieval algorithms model the brightness temperature as a function of soil moisture, surface conditions and vegetation. External data sources inform the algorithms about the surface conditions and vegetation, which enable the retrieval of soil moisture. The inversion process contains unc...
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#1Jinzheng Peng (USRA: Universities Space Research Association)H-Index: 1
#2Sidharth Misra (JPL: Jet Propulsion Laboratory)H-Index: 14
Last.Thomas J. Jackson (ARS: Agricultural Research Service)H-Index: 73
view all 17 authors...
The Soil Moisture Active/Passive (SMAP) microwave radiometer is a fully polarimetric L-band radiometer flown on the SMAP satellite in a 6 AM/6 PM sun-synchronous orbit at 685 km altitude. After the SMAP L1B_TB data product version 3 was released in 2016, the radiometer has been undergoing further calibration and validation with the goal of reducing both the bias in the cold-sky measurements and calibration drift in the global ocean measurements experienced during eclipse seasons in data product ...
2 CitationsSource
#1Andreas Colliander (California Institute of Technology)H-Index: 23
#2Michael H. Cosh (ARS: Agricultural Research Service)H-Index: 41
Last.Simon Yueh (California Institute of Technology)H-Index: 36
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Abstract The NASA's Soil Moisture Active Passive (SMAP) mission conducted a field experiment with its partners over two 40-km agricultural domains in Iowa and Manitoba in the summer of 2016 to address concerns observed in SMAP soil moisture (SM) retrievals over agricultural areas. The experiment featured airborne Passive Active L-band System (PALS) flights over each domain with intensive ground measurements and dense networks of SM monitoring stations. With two intensive observation periods sepa...
2 CitationsSource
#1Michael H. Cosh (USDA: United States Department of Agriculture)H-Index: 41
#2William A. White (USDA: United States Department of Agriculture)H-Index: 4
Last.Paul R. Bullock (UM: University of Manitoba)H-Index: 15
view all 11 authors...
Vegetation water content (VWC) is an important land surface parameter that is used in retrieving surface soil moisture from microwave satellite platforms. Operational approaches utilize relationships between VWC and satellite vegetation indices for broad categories of vegetation, i.e., “agricultural crops,” based on climatological databases. Determining crop type–specific equations for water content could lead to improvements in the soil moisture retrievals. Data to address this issue are lackin...
4 CitationsSource
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