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Detailed information of underwater topography is required for better understanding and prediction of water and sediment transport in\uda mountain channel. Recent research showed promising utility of green-wavelength Terrestrial Laser Scanning (TLS) for measuring\udsubmerged stream-bed structure in fluvial environment. However, difficulty in acquiring reliable underwater data has been remained\udin the part of mountain channel where water surface has some gradient. Since horizontal water surface was a major premise for the\udexisting water refraction correction method, significant error was resulted in such area. Therefore, this paper presents a modified\udmethod to correct water-refracted TLS data acquired over mountain channel with complex water-surface slope. Applicability of the\udmodified method was validated using the field data and compared with the existing correction method and non-corrected data. The\udresults showed that the modified method has much smaller error with RMSE value of 3 mm than the existing method (RMSE = 10\udmm) and non-corrected data (RMSE = 23 mm). Presented method successfully corrected water-refracted TLS data acquired over\udsloped channel. This would enable us to quantitatively measure whole units of complex mountain channels, and help us to\udunderstand water dynamics better in the area

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

IMPROVED CORRECTION METHOD FOR WATER-REFRACTED TERRESTRIAL LASER SCANNING DATA ACQUIRED IN THE MOUNTAIN CHANNEL