Mr. Ryota Kikuchi Profile

Ryota Kikuchi

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Proceedings Article | 22 October 2018 Paper

Reflectance comparison between Himawari-8 AHI and Terra MODIS over a forest of Shikoku region

Yusuke Adachi, Ryota Kikuchi, Masayuki Matsuoka, Kazuhito Ichii, Hiroki Yoshioka

Proceedings Volume 10777, 1077715 (2018) https://doi.org/10.1117/12.2324684

KEYWORDS: MODIS, Sensors, Reflectivity, Satellites, Atmospheric corrections, Data acquisition

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The combinatorial use of geostationary and polar-orbiting satellites is expected to provide a new approach to Earth observation with a wide range of applications; however, differences in the observation conditions and sensor specifications can introduce biases into the outputs of the various satellites. These differences are also known to depend on the land cover type, and this feature of the data requires thorough investigation. This study compared the solar reflective bands measured by the Advanced Himawari Imager (AHI) and an established sensor MODIS onboard Terra satellite. The comparison was made using data collected over a forested region on the Shikoku Island (30 km by 140 km) located in the south of Japan under similar view zenith angles of approximately 40 degrees. The reflectances of the visible and near-infrared bands (four bands) were processed to correct the molecular scattering and ozone absorption effect. A comparison was made before and after the atmospheric correction. Our results showed that the reflectance differences over the region fell mainly within the relevant standard deviations (reflectance variations within the relevant region), except for the green band. The larger difference between the green band reflectances measured by the two sensors was attributed to differences in the band positions. The band-4 of MODIS (green) covers 545-565 nm, whereas the AHI counterpart (band-2) covers 490-530 nm, providing little overlap with MODIS. These results suggested that special caution is needed when using data collected from these two sensors simultaneously or continuously if the green band is involved in the algorithm.

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