文献类型：期刊文献

英文题名：Precise Measurement of Stem Diameter by Simulating the Path of Diameter Tape from Terrestrial Laser Scanning Data

作者：You, Lei[1,2] Tang, Shouzheng[1] Song, Xinyu[3] Lei, Yuancai[1] Zang, Hao[1] Lou, Minghua[1] Zhuang, Chongyang[1]

第一作者：You, Lei

通信作者：Tang, SZ[1];Song, XY[2]

机构：[1]Chinese Acad Forestry, Inst Forest Resources Informat Tech, Beijing 100091, Peoples R China;[2]Xinyang Normal Univ, Coll Comp & Informat Technol, Xinyang 464000, Peoples R China;[3]Xinyang Normal Univ, Coll Math & Informat Sci, Xinyang 464000, Peoples R China

年份：2016

卷号：8

期号：9

外文期刊名：REMOTE SENSING

收录：;EI(收录号：20172203711096);Scopus(收录号：2-s2.0-85002710553);WOS:【SCI-EXPANDED(收录号:WOS:000385488000027)】；

基金：This study was supported by the National High Technology Research and Development Program of China (No. 2012AA102002), the National Science and Technology Support Project of the Twelfth Five-Year Plan of China (No. 2012BAD22B02), the National Natural Science Foundation of China (No. 31470641, No. 61331018, No. 11501489 and No. 61572417), the Science and Technology Cooperation Project of He' nan Province and Academy (No. 122106000052), and the Nanhu Scholars Program of XYNU.

语种：英文

外文关键词：stem diameter; TLS; point cloud; curve fitting; B-spline

摘要：Accurate measurement of stem diameter is essential to forest inventory. As a millimeter-level measuring tool, terrestrial laser scanning (TLS) has not yet reached millimeter-level accuracy in stem diameter measurements. The objective of this study is to develop an accurate method for deriving the stem diameter from TLS data. The methodology of stem diameter measurement by diameter tape was adopted. The stem cross-section at a given height along the stem was determined. Stem points for stem diameter retrieval were extracted according to the stem cross-section. Convex hull points of the extracted stem points were calculated in a projection plane. Then, a closed smooth curve was interpolated onto the convex hull points to simulate the path of the diameter tape, and stem diameter was calculated based on the length of the simulated path. The stems of different tree species with different properties were selected to verify the presented method. Compared with the field-measured diameter, the RMSE of the method was 0.0909 cm, which satisfies the accuracy requirement for forest inventory. This study provided a method for determining the stem cross-section and an efficient and precise curve fitting method for deriving stem diameter from TLS data. The importance of the stem cross-section and convex hull points in stem diameter retrieval was demonstrated.