本研究利用GPS衛星反射訊號，來遙測分析反射物體的反射能量。實驗體之反射物體為壚砪(Loam)，製造不同含水量，實驗體表面搔刮製造不同粗糙度。以衛星反射訊號利用Rayleigh’s法則推算反射物體的粗糙度因子及粗糙度(忽略介電係數)。衛星反射訊號推算之粗糙度曲線與實測粗糙度曲線平行。

GPS signal is utilized in remote sensing the reflective energy of experimental subject. The experimental subject is loam consisting sand , silt and clay. The experimental subject is scratched to produce various roughness. The roughness factor and roughness of the experimental subject are evaluated by Rayleigh’s rule using GPS signal (neglecting dielectric coefficient). The curve of roughness by GPS is parallel to that of roughness by geometrical measurement.

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