Calibration and validation of the ocean color version-3 product from ADEOS OCTS |
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| Authors: | Masanobu Shimada Hiromi Oaku Yasushi Mitomi Hiroshi Murakami Akira Mukaida Yasuhisa Nakamura Joji Ishizaka Hiroshi Kawamura Tasuku Tanaka Motoaki Kishino Hajime Fukushima |
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| Institution: | (1) Earth Observation Research Center, National Space Development Agency of Japan, 1-9-9, Roppongi, Minato-ku, 106-0032 Tokyo, Japan;(2) Remote Sensing Technology Center of Japan, 1-9-9, Roppongi, Minato-ku, 106-0032 Tokyo, Japan;(3) Faculty of Fisheries, Nagasaki University, 1-14, Bunkyo, 852-8521 Nagasaki, Japan;(4) Institute of Physical and Chemical Research, 2-1, Hirosawa, 350-0106 Wako, Saitama, Japan;(5) School of High-Technology for Human Welfare, Tokai University, 317 Nishino, 410-0395 Numazu, Japan |
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| Abstract: | We present calibration and validation results of the OCTS’s ocean color version-3 product, which mainly consists of the chlorophyll-a concentration (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 andnLw) 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-situnLw measurements. We confirmed that Chl-a was estimated with an accuracy of 68% for Chl-a less than 2 mg/m3, andnLw from 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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| Keywords: | Ocean color calibration validation radiance chlorophyll-a AVIRIS OCTS NASDA ADEOS |
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