Detailed Stem Measurements of Standing Trees from Ground-Based Scanning Lidar
Detailed Stem Measurements of Standing Trees from Ground-Based Scanning Lidar
复制标题
DOI：
10.1093/forestscience/52.1.67
复制
发表时间：
2006-01
期刊：
影响因子：
1.4
通讯作者：
J. Henning;P. Radtke
中科院分区：
文献类型：
--
作者：
J. Henning;P. Radtke
一个市售的平移和倾斜安装激光扫描仪被用来获取数据，为随后的三维建模和测量的立木。方法开发用于识别树木的距离图像和共注册从不同的Vantage位置获得的距离图像。从距离图像中获得的上茎直径和分支高度与少量火炬松（Pinus taeda L.）树树木识别假设树干横截面是圆形的，估计其几何中心在连续的高度干。然后使用多个高度的树中心估计来配准从不同Vantage位置拍摄的图像。共配准（x，y）误差不超过2.1厘米，在任何18对配准进行。结果表明，激光雷达衍生的直径估计值和卡尺测量值之间的高度一致（平均误差< 1厘米）的树干部分低于基地的活冠。对于高达13 m的茎高，获得了较不准确的估计值（<2 cm）。结果表明，潜在的准确评估分支或螺纹高度使用地面扫描激光雷达，最大的准确度可能会实现的分支附近的基地的活冠和低于它。
A commercially available pan-and-tilt mount laser scanner was used to acquire data for subsequent three-dimensional modeling and measurement of standing forest trees. Methods were developed for identifying trees in range images and co-registering range images acquired from different vantage points. Upper-stem diameters and branch heights derived from the range images were compared to measurements made after the felling of a small number of loblolly pine (Pinus taeda L.) trees. Tree identification assumed bole cross-sections were circular, estimating their geometric centers at successive heights up the stem. Tree center estimates at multiple heights were then used to co-register images made from different vantage points. Co-registration (x, y) errors did not exceed 2.1 cm in any of the 18 pairwise registrations carried out. Results showed excellent agreement (average error < 1 cm) between the lidar-derived diameter estimates and caliper measurements for bole sections below the base of live crown. Less accurate estimates (<2 cm) were obtained for stem heights up to 13 m. Results indicated the potential for accurate assessment of branch or whorl heights using ground-based scanning lidar, with the greatest accuracy likely to be realized for branches near the base of the live crown and below it.