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Proceedings Paper

Airborne active and passive L-band measurements using PALS instrument in SMAPVEX12 soil moisture field campaign
Author(s): Andreas Colliander; Simon Yueh; Seth Chazanoff; Steven Dinardo; Ian O'Dwyer; Thomas Jackson; Heather McNairn; Paul Bullock; Grant Wiseman; Aaron Berg; Ramata Magagi; Eni Njoku
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Paper Abstract

NASA’s (National Aeronautics and Space Administration) Soil Moisture Active Passive (SMAP) Mission is scheduled for launch in late 2014. The objective of the mission is global mapping of soil moisture and freeze/thaw state. Merging of active and passive L-band observations of the mission will enable unprecedented combination of accuracy, resolution, coverage and revisit-time for soil moisture and freeze/thaw state retrieval. For pre-launch algorithm development and validation the SMAP project and NASA coordinated a field campaign named as SMAPVEX12 (Soil Moisture Active Passive Validation Experiment 2012) together with Agriculture and Agri-Food Canada, and other Canadian and US institutions in the vicinity of Winnipeg, Canada in June-July, 2012. The main objective of SMAPVEX12 was acquisition of a data record that features long time-series with varying soil moisture and vegetation conditions over an aerial domain of multiple parallel flight lines. The coincident active and passive L-band data was acquired with the PALS (Passive Active L-band System) instrument. The measurements were conducted over the experiment domain every 2-3 days on average, over a period of 43 days. The preliminary calibration of the brightness temperatures obtained in the campaign has been performed. Daily lake calibrations were used to adjust the radiometer calibration parameters, and the obtained measurements were compared against the raw in situ soil moisture measurements. The evaluation shows that this preliminary calibration of the data produces already a consistent brightness temperature record over the campaign duration, and only secondary adjustments and cleaning of the data is need before the data can be applied to the development and validation of SMAP algorithms.

Paper Details

Date Published: 21 November 2012
PDF: 6 pages
Proc. SPIE 8524, Land Surface Remote Sensing, 85240G (21 November 2012); doi: 10.1117/12.977600
Show Author Affiliations
Andreas Colliander, Jet Propulsion Lab. (United States)
Simon Yueh, Jet Propulsion Lab. (United States)
Seth Chazanoff, Jet Propulsion Lab. (United States)
Steven Dinardo, Jet Propulsion Lab. (United States)
Ian O'Dwyer, Jet Propulsion Lab. (United States)
Thomas Jackson, U.S. Dept. of Agriculture (United States)
Heather McNairn, Agriculture and Agri-Food Canada (Canada)
Paul Bullock, Univ. of Manitoba (Canada)
Grant Wiseman, Agriculture and Agri-Food Canada (Canada)
Aaron Berg, Univ. of Guelph (Canada)
Ramata Magagi, Univ. of Sherbrooke (Canada)
Eni Njoku, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 8524:
Land Surface Remote Sensing
Dara Entekhabi; Yoshiaki Honda; Haruo Sawada; Jiancheng Shi; Taikan Oki, Editor(s)

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