TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 54 (No. 5), pp. 401-416, 1998

Calibration and Validation of the Ocean Color Version-3 Product from ADEOS OCTS

Masanobu Shimada1, Hiromi Oaku1, Yasushi Mitomi2, Hiroshi Murakami1, Akira Mukaida2, Yasuhisa Nakamura1, Joji Ishizaka3, Hiroshi Kawamura1, Tasuku Tanaka1, Motoaki Kishino4 and Hajime Fukushima5

1Earth Observation Research Center, National Space Development Agency of Japan, 1-9-9, Roppongi, Minato-ku, Tokyo 106-0032, Japan
2Remote Sensing Technology Center of Japan, 1-9-9, Roppongi, Minato-ku, Tokyo 106-0032, Japan
3Faculty of Fisheries, Nagasaki University, 1-14, Bunkyo, Nagasaki 852-8521, Japan
4Institute of Physical and Chemical Research, 2-1, Hirosawa, Wako, Saitama 350-0106, Japan
5School of High-Technology for Human Welfare, Tokai University, 317 Nishino, Numazu 410-0395, Japan

(Received 23 February 1998; in revised form 21 August 1998; accepted 24 August 1998)

Abstract: We present calibration and validation results of the OCTS's ocean color version-3 product, which mainly consists of the chlorophyll-aconcentration (Chl-a) and the normalized water-leaving radiance nLw). First, OCTS was calibrated for the inter-detector sensitivity difference, offset, and absolute sensitivity using external calibration source. It was also vicariously calibrated using in-situ measurements for water (Chl-a and nLw) and atmosphere (optical thickness), which were acquired synchronously with OCTS under cloud-free conditions. Second, the product was validated using selected 17 in-situ Chl-a and 11 in-situ nLw measurements. We confirmed that Chl-awas estimated with an accuracy of 68% for Chl-a less than 2 mg/m3, and nLwfrom 94% (band 2) to 128% (band 4). Geometric accuracy was improved to 1.3 km. Stripes were significantly reduced by modifying the detector normalization factor as a function of input radiance.


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