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Diffuse attenuation coefficient, K d (λ), has an empirical relationship with water depth, thus potentially to be used to estimate the depth of the water based on the light penetration in the water column. The aim of this research is to assess the relationship of diffuse attenuation coefficient with the water constituent and its relationship to estimate the depth of shallow waters of Air Island, Panggang Island and Karang Lebar lagoons and to compare the result of depth estimation from K d model and derived from Landsat 8 imagery. The measurement of K d (λ) was carried out using hyperspectral spectroradiometer TriOS-RAMSES with range 320 – 950 nm. The relationship between measurement K d (λ) on study site with the water constituent was the occurrence of absorption by chlorophyll-a concentration at the blue and green spectral wavelength. Depth estimation using band ratio from K d (λ) occurred at 442,96 nm and 654,59 nm, which had better relationship with the depth from in-situ measurement compared to the estimation based on Landsat 8 band ratio. Depth estimated based on Kd(λ) ratio and in-situ measurement are not significantly different statistically. Depth estimated based on K d (λ) ratio and in-situ measurement are not significantly different statistically. However, depth estimation based on K d (λ) ratio was inconsistent due to the bottom albedo reflection because the K d (λ) measurement was carried out in shallow waters. Estimation of water depth based on K d (λ) ratio had better results compared to the Landsat 8 band ratio.

international journal of remote sensing and earth sciences/international journal of remote sensing and earth sciences

IN-SITU MEASUREMENT OF DIFFUSE ATTENUATION COEFFICIENT AND ITS RELATIONSHIP WITH WATER CONSTITUENT AND DEPTH ESTIMATION OF SHALLOW WATERS BY REMOTE SENSING TECHNIQUE