IEG 환경지질연구정보센터

PRESENT STATUS OF GEOSTATIONARY OCEAN COLOR IMAGER

Yu-Hwan Ahn, Seongick CHO, Joo-Hyung Ryu

Korea Ocean Satellite Center, Korea Ocean Research & Development Institute Ansan P.O. Box 29, Seoul, 425-600, Republic of Korea

FAX : +82-31-400-7715 [email protected]

ABSTRACT: GOCI(Geostationary Ocean Color Imager) is the world's first ocean color observation imager in geostationary orbit. As a main payload of COMS(Communication, Ocean and Meteorological Satellite), GOCI was successfully launched at Kourou Space Center in French Guiana by Ariane 5 Launch Vehicle in 27 June 2010(Korea Standard Time).

GOCI is the one of the three main payloads in COMS, and it was successfully co-developed by Korea Aerospace Research Institute (KARI) and EADS Astrium in France followed by the user requirements derived from Korea Ocean Research & Development Institute (KORDI).

GOCI has six visible bands with band center 412nm, 443nm, 490nm, 555nm, 660nm and 680nm, and two near-infrared bands with band center 745nm and 865nm for the purpose of atmospheric correction. GSD(Ground Sampling Distance) of GOCI is about 500m at the center of the GOCI coverage area. The size and location of the GOCI coverage area is the 2,500km×2,500km square centered at 36˚ N and 130˚ E. GOCI coverage area composed of 16(4x4) slot images. Because GOCI equips 2D CMOS with 1430 x 1413 effective pixel array, GOCI IFOV corresponds to the FOV of the GOCI slot area. GOCI also has been developed to observe the GOCI coverage area by every hour and planned to observe and transmit 8 GOCI coverage area images per day. The mission life time of the GOCI is about 7 years after In-Orbit Test(IOT).

At this moment, GOCI is operated under the In-Orbit Test Plan. GOCI functional test to verify the operability of GOCI was successfully accomplished, and GOCI radiometric and geometric tests are on-going. In parallel, operation test and verification of GOCI ground processing system equipped in KOSC are on-going without any major issue. In this paper, we present the current status of GOCI including preliminary results of GOCI In-Orbit Test.

KEY WORDS: GOCI, COMS, Geostationary Orbit, Ocean Color, Radiometric Calibration, Geometric Correction, In-

Orbit Test

Figure 1. GOCI pseudo-colour RGB composite image using GOCI bands 1, 4 and 6, generated from the GOCI Level

1B test result acquired on September 16, 2010.