Geostationary Ocean Color Imager

Geostationary Ocean Color Imager (GOCI, /ɡɔːθi/), is the world's first geostationary orbit satellite image sensor in order to observe or monitor an ocean-color around the Korean Peninsula [1][2]. The spatial resolution of GOCI is about 500m and the range of target area is about 2,500 km×2,500 km centered on Korean Peninsula. GOCI was loaded on Communication, Ocean, and Meteorological Satellite (COMS) of South Korea which was launched in June, 2010. It will be operated by Korea Ocean Satellite Center (KOSC) at Korea Institute of Ocean Science & Technology (KIOST), and capture the images of ocean-color around the Korean Peninsula 8 times a day for 7.7 years.

The ocean data products that can be derived from the measurements are mainly the chlorophyll concentration, the optical diffuse attenuation coefficients, the concentration of dissolved organic material or yellow substance, and the concentration of suspended particles in the near-surface zone of the sea. In operational oceanography, satellite derived data products are used in conjunction with numerical models and in situ measurements to provide forecasting and now casting of the ocean state. Such information is of genuine interest for many categories of users.

Vision and goals

  • Detecting, monitoring and predicting short term biophysical phenomena
  • Studies on biogeochemical variables and cycle
  • Detecting, monitoring and predicting noxious or toxic algal blooms of notable extension
  • Monitoring the health of marine ecosystem
  • Coastal zone and resource management
  • Producing an improved marine fisheries information to the fisherman communities
  • Deriving Yellow dust and the land classified information

GOCI specification

Description Specification
Detector CMOS (2D, 1415×1432 pixels)
Radiometric Calibration Solar diffuser & DAMD(Diffuser Aging Monitoring Device)
Resolution (GSD) 500m
Total FOV 16 slots, 5,300×5,300 Pixels
Coverage 2,500 km×2,500 km
Longitude 128.2°E
Altitude 35,786 km
SNR > 1,000
MTF > 0.3
# of Bands 8개 (6-Visible, 2-NIR)
Spectral Coverage 400~900 nm

GOCI bands

Band(#) Central Wavelengths(nm) Bandwidth(nm) SNR Type Primary Application
1 412 20 1,000 Visible Yellow substance and turbidity
2 443 20 1,090 Visible Chlorophyll absorption maximum
3 490 20 1,170 Visible Chlorophyll and other pigments
4 555 20 1,070 Visible Turbidity, suspended sediment
5 660 20 1,010 Visible Atmospheric correction for turbid water, Baseline of fluorescence signal, Chlorophyll, suspended sediment
6 680 10 870 Visible fluorescence signal
7 745 20 860 NIR Atmospheric correction and baseline of fluorescence signal
8 865 40 750 NIR Atmospheric correction, vegetation, water vapor reference over the ocean

See also

References

  1. https://web.archive.org/web/20130325103032/http://kosc.kordi.re.kr/oceansatellite/coms-goci/introduction.kosc
  2. Seongick Cho, Yu-Hwan Ahn, Joo-Hyung Ryu, Gm-Sil Kang, and Heong-Sik Youn, “Development of Geostationary Ocean Color Imager (GOCI),” Korean Journal of Remote Sensing, vol.26, no.2, 2010, pp. 157–165.

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