Geostationary Ocean Color Imager
Geostationary Ocean Color Imager (GOCI), pronounced ‘gɔθi‘, 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 2,500km×2,500km 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 | 2,500km×2,500km |
| Longitude | 128.2°E |
| Altitude | 35,786km |
| SNR | > 1,000 |
| MTF | > 0.3 |
| # of Bands | 8개 (6-Visiable, 2-NIR) |
| Spectral Coverage | 400~900nm |
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
- http://kosc.kordi.re.kr/oceansatellite/coms-goci/introduction.kosc
- 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.