Hyperspectral Imager Suite (HISUI) is a Japanese future space-borne hyperspectral instrument being developed by
Ministry of Economy, Trade, and Industry (METI). HISUI will be launched in 2019 or later onboard International
Space Station (ISS) as platform. HISUI has 185 spectral band from 0.4 to 2.5 μm with 20 by 30 m spatial resolution
with swath of 20 km. Swath is limited as such, however observations in continental scale area are requested in HISUI
mission lifetime of three years.
Therefore we are developing a scheduling algorithm to generate effective observation plans. HISUI scheduling
algorithm is to generate observation plans automatically based on platform orbit, observation area maps (we say DAR;
“Data Acquisition Request” in HISUI project), their priorities, and available resources and limitation of HISUI system
such as instrument operation time per orbit and data transfer capability.
Then next we need to set adequate DAR before start of HISUI observation, because years of observations are needed to
cover continental scale wide area that is difficult to change after the mission started. To address these issues, we have
developed observation simulator. The simulator’s critical inputs are DAR and the ISS’s orbit, HISUI limitations in
observation minutes per orbit, data storage and past cloud coverage data for term of HISUI observations (3 years). Then
the outputs of simulator are coverage map of each day. Areas with cloud free image are accumulated for the term of
observation up to three years. We have successfully tested the simulator and tentative DAR and found that it is possible
to estimate coverage for each of requests for the mission lifetime.