The Global Change Observation Mission (GCOM) consists of two polar orbiting satellite observing systems, GCOM-W
(Water) and GCOM-C (Climate), and three generations to achieve global and long-term monitoring of the Earth.
GCOM-W1 is the first satellite of the GCOM-W series and scheduled to be launched in Japanese fiscal year 2011. The
Advanced Microwave Scanning Radiometer-2 (AMSR2) will be the mission instrument of GCOM-W1. AMSR2 will
extend the observation of currently ongoing AMSR-E on EOS Aqua platform. Development of GCOM-W1 and AMSR2
is progressing on schedule. Proto-flight test (PFT) of AMSR2 was completed and delivered to the GCOM-W1 satellite
system. Currently, the GCOM-W1 system is under PFT at Tsukuba Space Center until summer 2011 before shipment to
launch site, Tanegashima Space Center. Development of retrieval algorithms has been also progressing with the
collaboration of the principal investigators. Based on the algorithm comparison results, at-launch standard algorithms
were selected and implemented into the processing system. These algorithms will be validated and updated during the
initial calibration and validation phase. As an instrument calibration activity, a deep space calibration maneuver is
planned during the initial checkout phase, to confirm the consistency of cold sky calibration and intra-scan biases.
Maintaining and expanding the validation sites are also ongoing activities. A flux tower observing instruments will be
introduced into the Murray-Darling basin in Australia, where the validation of other soil moisture instruments (e.g.,
SMOS and SMAP) is planned.