多波長イメージ分光放射計を用いた沿岸域海色リモートセンシングの試験研究


杉山領, 大石友彦, 田中昭彦, 丹佑之,.”多波長イメージ分光放射計を用いた沿岸域海色リモートセンシングの試験研究”, Journal of The Remote Sensing Society of Japan, Vol.36, No.2, (2016), pp. 000-000.

Abstract
The ocean color remote sensing by a satellite is useful technology to retrieve water constituents with the advantage of high repeatability, rapidity and wide covering range. However, it has some difficulties when we apply it to coastal waters, due to optically complex constituents and low special resolution, for instance. In particular, the backward scattering coefficient, which governs the ocean color together with the absorption coefficient, is extremely difficult to measure. Recently, we developed a bypass method to determine it with the accuracy of 3 %. That is, we have a tool in our hand to develop the ocean color algorithm for coastal waters. In response to this, we also developed a multi-band imaging radiometer, which is compact and light weight mounting on a multicopter. Our radiometer has 12 channels of wavelength between 400 nm and 800 nm, and the signal to noise ratios of all channels are adjusted so as to have almost same level with the help of neutral density filters. We made several test flights to check the performance of the radiometer in Suruga Bay. Although it is simple analysis, the results show that 1)
we could clearly detected highly suspended particle area, and 2) the influence of atmosphere on radiance measurements is negligible in the case of low latitude observation, and 3) observed spectral radiance were exhibited the typical spectral shapes of Case2 Water.

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