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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andreas Colliander ; Simon Yueh ; Seth Chazanoff ; Steven Dinardo ; Ian O'Dwyer, et al.
Airborne active and passive L-band measurements using PALS instrument in SMAPVEX12 soil moisture field campaign
", Proc. SPIE 8524, Land Surface Remote Sensing, 85240G (November 21, 2012); doi:10.1117/12.977600; http://dx.doi.org/10.1117/12.977600