GOCI in-orbit radiometric calibration status after four-year operation

Title
GOCI in-orbit radiometric calibration status after four-year operation
Author(s)
조성익; 안기범; 오은송; 박영제; 김석환
KIOST Author(s)
Cho, Seong Ick(조성익)Park, Young Je(박영제)
Publication Year
2015-08-11
Abstract
The first spaceborne imager for ocean color remote sensing in Geostationary
Earth Orbit (GEO), GOCI (Geostationary Ocean Color Imager)/COMS
(Communication, Ocean and Meteorological Satellite), is successfully
operated over the four years since its launch in June 2010. In order to fulfill
the ocean color monitoring mission in geostationary orbit, GOCI implements
2D CMOS FPA (Focal Plane Array) with 2 million pixels, which enables
staring capture method with 700km x 700km IFOV (Instantaneous Field
of View) and 500m GSD (Ground Sampling Distance) over the center of
the coverage area (130˚E, 36˚N) which corresponds to 380m GSD over the
nadir. GOCI can observe Korea, Japan, and coastal region of China with 4 x
4 slot image acquisitions. One slot image of GOCI is equivalent to IFOV, and
size of coverage area with 4 x 4 slot images is 2,500km x 2,500km including
overlap area among adjacent slot images. GOCI equips 8 spectral bands.
In visible wavelength region from 402nm to 685nm, 6 spectral bands are
implemented on GOCI with the bandwidth of 20nm (for B1 ~B5) or 10nm
(for B6, central wavelength at 680nm). Two spectral bands located in NIR
wavelength region with band center at 745nm and 865nm are mainly used
for the atmospheric correction.
In-orbit calibration method of GOCI is solar calibration using onboard Solar
Diffuser (SD) and Diffuser Aging Monitoring Device (DAMD) equipped in
the Shutter Wheel since its launch in June 2010. In order to fulfill
the ocean color monitoring mission in geostationary orbit, GOCI implements
2D CMOS FPA (Focal Plane Array) with 2 million pixels, which enables
staring capture method with 700km x 700km IFOV (Instantaneous Field
of View) and 500m GSD (Ground Sampling Distance) over the center of
the coverage area (130˚E, 36˚N) which corresponds to 380m GSD over the
nadir. GOCI can observe Korea, Japan, and coastal region of China with 4 x
4 slot image acquisitions. One slot image of GOCI is equivalent to IFOV, and
size of coverage area with 4 x 4 slot images is 2,500km x 2,500km including
overlap area among adjacent slot images. GOCI equips 8 spectral bands.
In visible wavelength region from 402nm to 685nm, 6 spectral bands are
implemented on GOCI with the bandwidth of 20nm (for B1 ~B5) or 10nm
(for B6, central wavelength at 680nm). Two spectral bands located in NIR
wavelength region with band center at 745nm and 865nm are mainly used
for the atmospheric correction.
In-orbit calibration method of GOCI is solar calibration using onboard Solar
Diffuser (SD) and Diffuser Aging Monitoring Device (DAMD) equipped in
the Shutter Wheel
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25345
Bibliographic Citation
SPIE OPTICS+PHOTONICS 2015, pp.664, 2015
Publisher
SPIE
Type
Conference
Language
English
Publisher
SPIE
Related Researcher
Research Interests

Development of Ocean Satellites and Data Analytics,해양위성 및 영상분석 실용화 기술 개발

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