地面光達之強度值可被用來描述物體表面之相對反射率，且雷射光束之入射角、雷射發射位置與物體表面間之距離、及物體表面種類皆會影響地面光達之強度值。雙向反射分布函數可用來描述入射角及地面光達強度值之間的關係，本研究採用五種遙測之半經驗式雙向反射分布函數模型來探討其描述地面光達強度值資料在不同入射角之特性，其中包含有RPV模型及四種kernel-driven模型，總共使用十二種人造表面來測試各模型的適用性，並依據視覺檢視擬合之整體趨勢及決定係數來評估各半經驗式雙向反射分布函數模型對地面光達強度值擬合曲線之擬合好壞。結果顯示Rossthin-Roujean模型及RPV模型最適用於地面光達資料。

Terrestrial Laser Scanning (TLS) intensity data can be regarded as the relative reflectance of the surface material. TLS intensity is a function of the angle of incidence of the laser beam, the range distance between the laser and the surface, and the surface type. The Bidirectional Reflectance Distribution Function (BRDF) was used to describe the relation between the angle of incidence and TLS intensity. Five remote sensing semi-empirical BRDF models, including Rahman–Pinty–Verstraete (RPV) model and four kernel-driven models derived from Ross (1981), were evaluated using twelve flat sample materials. The goodness of fit of the BRDF models to the TLS intensity are evaluated based on visual examination of the fitted trend and their corresponding coefficients of determination. The results show that the Rossthin-Roujean model and RPV model are the most suitable for TLS data.

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