Radiometric performance of Second-generation Global Imager (SGLI) using integrating spheres

Hashiguchi, Taichiro; Okamura, Yasuyuki; Tanaka, Kazuhiro; Nakajima, Yumiko; Suzuki, Koichi; Sakashita, Takashi; Amano, Takahiro

doi:10.1117/12.2241955

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…Here, L sun is supposed to be constant and G 0 was characterized as quadratic equations between radiance and CCD response for each sub-pixel using an integrating sphere that is traceable to National Standards before launch [19]. G temp is obtained at both the ground thermal vacuum test and the on-orbit initial checkout by changing the CCD temperature, and were 0.05%/degree for the VN9 band and 0.25%/degree for the VN10 and VN11 bands.…”

Section: Telescopementioning

confidence: 99%

Radiometric Model and Inter-Comparison Results of the SGLI-VNR On-Board Calibration

et al. 2019

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The Second Generation Global Imager (SGLI) on Global Change Observation Mission-Climate (GCOM-C) satellite empowers surface and atmospheric measurements related to the carbon cycle and radiation budget, with two radiometers of Visible and Near Infrared Radiometer (SGLI-VNR) and Infrared Scanning Radiometer (SGLI-IRS) that perform a wide-band (380 nm-12 µm) optical observation not only with as wide as a 1150-1400 km field of view (FOV), but also with as high as 0.25-0.5 km resolution. Additionally, polarization and along-track slant view observations are quite characteristic of SGLI. It is important to calibrate radiometers to provide the sensor data records for more than 28 standard products and 23 research products including clouds, aerosols, ocean color, vegetation, snow and ice, and other applications. In this paper, the radiometric model and the first results of on-board calibrations on the SGLI-VNR, which include weekly solar and light-emitting diode (LED) calibration and monthly lunar calibration, will be described. Each calibration data was obtained with corrections, where beta angle correction and avoidance of reflection from multilayer insulation (MLI) were applied for solar calibration; LED temperature correction was performed for LED calibration; and the GIRO (GSICS (Global Space-based Inter-Calibration System) Implementation of the ROLO (RObotic Lunar Observatory) model) model was used for lunar calibration. Results show that the inter-comparison of the relative degradation amount between these three calibrations agreed to within 1% or less.

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Section: Telescopementioning

confidence: 99%

Radiometric Model and Inter-Comparison Results of the SGLI-VNR On-Board Calibration

et al. 2019

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“…In addition, several other polarimeters have been launched or are planned for launch by the Japanese and Chinese space agencies. The SGLI instrument was recently launched on the JAXA GCOM-C spacecraft and combines single view angle, multispectral VIS/NIR/SWIR/TIR channels with slant-view polarisation sensitivity at two VIS wavelengths (Hashiguchi et al, 2016). The CAPI instrument launched on-board the Chinese Tansat satellite obtains images of radiance in five channels in the VIS/NIR/SWIR spectrum, two of which also measure the polarisation at 0.67 and 1.64 μm (Chen et al, 2017).…”

Section: Polarimetric Remote Sensingmentioning

confidence: 99%

Harnessing remote sensing to address critical science questions on ocean-atmosphere interactions

Neukermans

Harmel

Galí

et al. 2018

Elementa: Science of the Anthropocene

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Earth observing systems have proven to be a unique source of long-term synoptic information on numerous physical, chemical and biological parameters on a global scale. Merging this information for integrated studies that peruse key questions about the ocean-atmosphere interface is, however, very challenging. Such studies require interdisciplinary frameworks and novel insights into ways to address the problem. We present here a perspective review on how current and emerging remote sensing technologies could help address two scientific questions within the Surface Ocean-Lower Atmosphere Study (SOLAS) science plan: (1) to what extent does upper-ocean biology affect the composition and radiative properties of the marine boundary layer; and (2) to what extent does upper-ocean turbulence drive fluxes of mass and energy at the air-sea interface. We provide a thorough review of how these questions have been addressed and discuss novel potential avenues using multiplatform space-borne missions, from visible to microwave, active and passive sensors.

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“…It is the most common water color observation instrument in the world. The main imaging spectrometers used for ocean color observation abroad are The Coastal Imaging Spectrometer(COIS) [2] , Hyperion [3] , Hyperspectral Imager for the Coastal Ocean(HICO) [4] , Geostationary Ocean Color Imager (GOCI) [5] , Second Generation Global Imager (SGLI) [6] , Ocean Color Instrument(OCI) [7] , etc. The domestic spaceborne ocean color monitors mainly include Chinese Ocean Color and Temperature Scanner carried by ocean satellites and a new generation of Ocean Color and Temperature Scanners carried by new generation ocean color satellites.…”

Section: Introductionmentioning

confidence: 99%

Design of high resolution imaging spectrometer for ocean color detection

Song,

Chen,

Pan

et al. 2024

International Conference on Optics and Machine Vision (ICOMV 2024)

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In this paper, a visible-near infrared imaging spectrometer optical system is designed, which is used to detect seawater elements and provides a favorable monitoring means for the protection of marine resources. According to the application background of ocean color detection instruments, the index parameters of the instrument are determined, and a high resolution imaging spectrum system is designed. The front telescope system adopts an off-axis three mirror anastigmat without intermediate real image, with the focal length of 590.75mm and the entrance diameter of 118.15mm；The system comprises an innovative spectrometer design with 0.6 magnification. The de-magnifying optical design allows the telescope to operate at F#/5, while the spectrometers are built in a more compact arrangement at F#/3.The main mirror and three mirrors use Zernike Fringe Sag surface to compensate for the aberration introduced by breaking the classical Offner concentric and isometric structure. The whole optical system comprises a single telescope feeding two functionally identical spectrometers. The spectral range is 0.4-0.9μm, field of view angle is 19 °, spectral resolution is 5nm and instantaneous field of view angle is 0.048mrad, the full field of view and full band MTF is more than 0.8, which is close to the diffraction limit, the RMS radius is less than 4 μm, and the smile and keystone of the spectrometer are less than 10% pixels.

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Radiometric performance of Second-generation Global Imager (SGLI) using integrating spheres

Cited by 4 publications

References 1 publication

Radiometric Model and Inter-Comparison Results of the SGLI-VNR On-Board Calibration

Radiometric Model and Inter-Comparison Results of the SGLI-VNR On-Board Calibration

Harnessing remote sensing to address critical science questions on ocean-atmosphere interactions

Design of high resolution imaging spectrometer for ocean color detection

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