针对现有提取单木结构参数的方法精度不高的现状,文章研究利用地面三维激光扫描数据提取单木的高度、胸径和冠幅,特别是将RANSAC算法用于圆拟合,提高了胸径的反演精度。最后利用野外实测数据进行验证,并比较分析了Hough变换和RANSAC算法在提取胸径中的差异。结果表明,本文方法提取的单木参数精度较高;并且无论从相关系数、平均残差还是均方根误差等方面,RANSAC算法提取的胸径精度均高于Hough变换方法。 In view of the current situation that the method of extracting single wood structure parameters is not accurate, the article studies the height, the diameter at breast height and the crown width of the single wood by using the ground three-dimensional laser scanning data. Especially, the RANSAC algorithm is applied to the circle fitting to improve the DBH Inversion accuracy. At last, field data were used to verify the differences between Hough transform and RANSAC in extracting DBH. The results show that the precision of the single wood parameters extracted by this method is high, and the accuracy of RANSAC algorithm is higher than the Hough transform method in terms of correlation coefficient, average residual error or root mean square error.