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2001•Geophysical Research LettersOpen access

Intercomparison of spaceborne ocean color measurements between OCI and SeaWiFS

Chung‐Ru Ho, Li‐Shang Lee, Nan‐Jung Kuo, Hsien‐Wen Li, Chun‐Te Chen

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Abstract

Based on ten ocean color images that were obtained simultaneously by the Ocean Color Imager (OCI) and the Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS), an intercomparison study shows that the two data sets are highly correlated. The data from the two different sensors were processed with SeaWiFS atmospheric correction and bio‐optical algorithms to derive the chlorophyll‐a concentration (Chl‐a). The difference of total radiance received at the sensor of OCI and SeaWiFS is in the range of 3.8% at 510 nm to 21.5% at 865 nm. The difference of Chl‐a derived from OCI and SeaWiFS is about 12.4%. Correlation coefficients between OCI and SeaWiFS of total radiance and Chl‐a are higher than 0.91. The validity of the free data from OCI on‐board ROCSAT‐1, the first scientific experimental satellite of Taiwan, is established.

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What this paper is about

Based on ten ocean color images that were obtained simultaneously by the Ocean Color Imager (OCI) and the Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS), an intercomparison study shows that the two data sets are highly correlated. The data from the two different sensors were processed with SeaWiFS atmospheric correction and bio‐optical algorithms to derive the chlorophyll‐a concentration (Chl‐a). The difference of total radiance received at the sensor of OCI and SeaWiFS is in the range of 3.8% at 510 nm to 21.5% at 865 nm. The difference of Chl‐a derived from OCI and SeaWiFS is about 12.4%. Correlation coefficients between OCI and SeaWiFS of total radiance and Chl‐a are higher than 0.91. The validity of the free data from OCI on‐board ROCSAT‐1, the first scientific experimental satellite of Taiwan, is established.

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Available abstract

Based on ten ocean color images that were obtained simultaneously by the Ocean Color Imager (OCI) and the Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS), an intercomparison study shows that the two data sets are highly correlated. The data from the two different sensors were processed with SeaWiFS atmospheric correction and bio‐optical algorithms to derive the chlorophyll‐a concentration (Chl‐a). The difference of total radiance received at the sensor of OCI and SeaWiFS is in the range of 3.8% at 510 nm to 21.5% at 865 nm. The difference of Chl‐a derived from OCI and SeaWiFS is about 12.4%. Correlation coefficients between OCI and SeaWiFS of total radiance and Chl‐a are higher than 0.91. The validity of the free data from OCI on‐board ROCSAT‐1, the first scientific experimental satellite of Taiwan, is established.

Key concepts: SeaWiFS, Ocean color, Radiance, Satellite, Remote sensing, Environmental science, On board, Atmospheric correction

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