TLS强度数据的入射角及距离效应改正方法

通过分离目标反射率、入射角及距离三个因素，利用Weierstrass定理，将激光强度表示成三个因素多项式函数的乘积形式，提出一种新的地面三维激光扫描（terrestrial laser scanning，TLS）激光强度改正模型。利用不同反射率的漫反射目标，设计入射角与距离实验，确定各个多项式的次数及系数，求取改正后激光强度值。实验结果表明，与现有改正模型进行比较，本文模型能精确地对激光强度值进行改正，并可以推广到自然目标强度数据的改正。

Correction for Incidence Angle and Distance Effects on TLS Intensity Data

By separating the target reflectance, incidence angle, and distance, the intensity value is expressed as the product of these three factors in the form of their polynomial functions based on the Weierstrass approximation theorem and a new terrestrial laser scanning (TLS) intensity data correction model is proposed. By using diffuse targets with different reflectance values, incidence angle and distance experiments are conducted to estimate the degrees and coefficients of each polynomial by the least squares adjustment and then the corrected intensity. The results show that compared with existing methods the proposed model can accurately correct the intensity value and can be extended to natural surfaces.