[A-CG38] Satellite Earth Environment Observation

[ACG38-17] The Operational Observation of Hyperspectral Imager Suite (HISUI) in 2020 - 2021 and Early Achievements

*Tsuneo Matsunaga¹, Akira Iwasaki², Tetsushi Tachikawa³, Jun Tanii³, Osamu Kashimura³, Koichiro Mouri³, Hitomi Inada³, Satoshi Tsuchida⁴, Ryosuke Nakamura⁴, Hirokazu YAMAMOTO⁴, Koki Iwai⁴ (1.Center for Global Environmental Research and Satellite Observation Center, National Institute for Environmental Studies, 2.The University of Tokyo, 3.Japan Space Systems, 4.National Institute of Advanced Industrial Science and Technology)

Keywords:geology, bathymetry, agriculture, waste, greenhouse gas

Hyperspectral Imager Suite (HISUI) is a spaceborne imaging spectrometer funded by Ministry of Economy, Trade, and Industry, Japan. It consists of a reflective telescope and two spectrometers which cover the visible and near infrared region (VNIR, 0.4 - 1.0 µm) and the shortwave infrared region (SWIR, 1.0 - 2.5 µm). Each spectrometer consists of a grating and a two-dimensional detector. SWIR spectrometer has a Stirling cooler for the SWIR detector. HISUI's spatial resolution and swath are 20 x 31 m / pixel and 20 km.

HISUI was delivered to International Space Station (ISS) by Space-X's CRS-19 mission in December 2019. HISUI Exposed Payload System (EPS) including the hyperspectral imager, the structure, the thermal control system, the electrical system, and Mission Data Processor (MDP), was attached to Japan Experiment Module Exposed Facility (JEM EF) of ISS. HISUI Mission Data Recorder (MDR-PM) was installed on JEM Pressurized Module (PM). HISUI will be operated until FY2023.

HISUI's initial checkout process and tests of ground data system were successfully completed by October 2020, and its nominal operation was started. HISUI data are currently being acquired based on data acquisition requests from HISUI Project and principal investigators of HISUI Research Announcement. The total area of acquired HISUI data by December 2021 exceeded 110 M km2 and the data are being used in various application studies.

HISUI's application studies include, plastic materials, agriculture, coastal bathymetry, metal and rare earth element resources, oil and gas resources, and anthropogenic emissions of carbon dioxide and methane. Several mapping results from HISUI were compared to other satellite, airborne, and ground-based data to evaluate HISUI performance.

In this presentation, HISUI's status and early achievements based on the data operationally acquired in 2020 - 2021 will be introduced.