 This study found that combining airborne laser scanning, ALS, and terrestrial laser scanning, TLS, can reduce the error rate in measuring tree parameters such as tree height, TH, crown base height, CBH, crown area, CA, and crown volume, CV. The ALS derived TH, CA, and CV were underestimated while CBH was overestimated when compared with the TLS derived parameters. However, the R2 coefficient from the regression analysis between the ALS and TLS estimations was approximately 0.94, indicating that the combined use of ALS and TLS can improve the accuracy of tree parameter measurements. This article was authored by Wu Qianli, Xiang Zhenyu, Taijin Park, and others.