The long-term vicarious and cross calibration plan for Hyper-spectral Imager Suite (HISUI)

The hyperspectral and multispectral remote sensing mission named HISUI is the Japanese next-generation Earth observation project that will be onboard ALOS-3. HISUI will be composed of hyperspectral imager (185 spectral bands in VNIR-SWIR region with 30 m spatial resolution) and multispectral imager (4 spectral bands in VNIR region with 5 m spatial resolution). To expand use of Earth observation data from HISUI, quality assurance and control of data products is indispensable, therefore, the long-term radiometric calibration has a crucial role. The objective of this research is to establish the techniques and develop the plans for conducting the in-flight radiometric calibration of HISUI with high frequency, reliability, and stability, based on the traditional in-flight radiometric calibration for multispectral sensors.

1. INTRODUCTION

Hyperspectral Imager Suite (HISUI), developed by Ministry of Economy, Trade and Industry (METI) of Japan, is a Japanese next-generation Earth observation project, which will be onboard Advanced Land Observation Satellite 3 (ALOS-3) of Japan Aerospace Exploration Agency (JAXA) launched in 2015 [1]– [3]. HISUI has a heritage from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) onboard Terra launched in December 1999 as part of NASA's Earth Observing System (EOS) project, which has been operating well over 10 years [4]. The major specifications of HUSUI are summarized in Table 1. HISUI will be composed of hyperspectral imager and multispectral imager. The hyperspectral imager has a total of 185 spectral bands from visible to short-wavelength infrared region (400–2500 nm) with 30 m spatial resolution and 30 km swath width. The multispectral imager has 4 spectral bands from visible to near-infrared region (450– 900 nm) with 5 m spatial resolution and 90 km swath width. The orbit of ALOS-3 is sun-synchronous at about 620 km altitude with local time at descending node of 10:30 (TBD) and the repeat cycle is 60 days. ALOS-3 will also carry panchromatic stereo camera with 0.8 m spatial resolution and 50 km swath width. The HISUI project aims to contribute to exploration of global resources, monitoring of global environmental changes, and other applications.