1-1. HISUI
HISUI is the next-generation hyperspectral sensor on board the International Space Station, which has a heritage of ASTER. Hyperspectral sensor obtains more than 100 spectral bands of images, which is useful for distinguish of ground objects. The hardware development and fundamental data processing in the project are under way.
It was launched from Cape Canaveral Air Force Station on December 2019.
A SpaceX Dragon cargo spacecraft is on its way to the International Space Station after launching on Dec. 5 at 12:29 p.m. EST.
For details, see https://www.sal.t.u-tokyo.ac.jp/aiwasaki/hisui-launch.html .
https://ssl.jspacesystems.or.jp/en_project_hisui
| Instrument Type | VNIR | SWIR |
| Spatial scanning | Push broom | Push broom |
| IFOV | 48.5μrad （20m) | 48.5μrad （20m) |
| FOV | 48.5 mrad ( around 30km) | 48.5 mrad ( around 30km) |
| Observation Frequency | 4.36 ms | 4.36 ms |
| Wavelength region and number of bands / Center wave length | 400 – 970nm / 57 bands | 900 – 2500 nm / 128 bands |
| Spectral resolution (sampling)/ Spectral band width | 10 nm | 12.5 nm |
| Spectral resolution(ILS, FWHM) | 11 nm | 16 nm |
| Dynamic range | Saturated at 70% Albedo | Saturated at 70% Albedo |
| SNR | 450 @ 620 nm | 300 @ 2100 nm |
| MTF | 0.2 | 0.2 |
| Smile and Keystone | 1pixel | 1 pixel |
| Calibration Accuracy (Radiometric) | Absolute：5% Among bands：2% | Absolute：5% Among bands：2% |
| Calibration Accuracy (Spectral) | 0.2 nm | 0.625 nm |
| Quantization | 12 bit | 12 bit |
| Mission life | 5 years | 5 years |
1-2. Unmanned Air Vehicle (UAV)
Unmanned aerial vehicle is a new platform for remote sensing. Hyperspectral data for agricultural areas are obtaiend using the system. Since hyperspectral sensor operates in the pushbroom scaning mode like a line sensor, a special geometric correction is needed.
