基于无人机数据的人工林森林参数估测
收稿日期: 2019-09-13
修回日期: 2019-10-12
网络出版日期: 2020-09-18
基金资助
国家自然科学基金“基于情景分析与多目标决策的南方集体林长期经营规划方法研究”(31770679)
Plantation Forest Parameter Estimation Based on UAV Data
Received date: 2019-09-13
Revised date: 2019-10-12
Online published: 2020-09-18
无人机凭借低成本、高精度的优势在森林资源调查中被广泛应用,基于无人机高分影像及点云数据的森林主要参数估测及评价方法研究,可以为无人机技术在人工林调查中的推广应用提供科学参考。选取南京林业大学树木园内东方杉(Taxodium mucronatum)人工实验林为研究对象,以2018年无人机高分影像、点云数据以及地面实测数据为主要信息源,通过局部最大值以及种子点分割的方法对株数、树高、冠幅、郁闭度等森林参数进行提取,并进行精度检验。研究结果表明:1)提取的株树探测率为0.92,株数准确率为0.97,F参数为0.95。2)单木树高估测的决定系数(R2)为0.795 7,均方根误差(RMSE)为0.594 0;单木冠幅直径的决定系数(R2)为0.800 8,均方根误差(RMSE)为0.897 8。3)提取的总冠幅的提取率达到0.95,准确率达到0.93,f参数达到0.94。4)提取的样地郁闭度相对误差只有0.32%。基于无人机高分数据及少量地面实测数据的人工林主要参数估测,可以在很大程度上替代全林实测,在人工林中具有较大的推广价值。
汪霖 , 李明阳 , 方子涵 , 李超 , 钱春花 , 许振宇 . 基于无人机数据的人工林森林参数估测[J]. 林草资源研究, 2019 , 0(5) : 61 -67 . DOI: 10.13466/j.cnki.lyzygl.2019.05.011
Unmanned aerial vehicle(UAV) has been widely used in forest resource investigation because of its low cost and high precision.The study on estimation and evaluation methods of main forest parameters using UAV high-resolution image and point cloud data can provide scientific reference for the spread and application of UAV technology in plantation forest survey.In this paper,experimental plantation forest of Taxodium mucronatum in the arboretum of Nanjing Forestry University was selected as the research object.The data of high-resolution image of UAV,point cloud and ground observation in 2018 were used as the main information sources.The number of trees,tree height,crown width and canopy closure were calculated by local maximum and seed point segmentation.The parameters are extracted and the accuracy is evaluated.The results show that:(1) the detection rate of the extracted tree is 0.92,the accuracy of the number of trees is 0.97,and the value of F parameter is 0.95;(2) the determination coefficient R2 of single tree height is 0.7957,the root mean square error RMSE of height is 0.5940,and the determination coefficient R2 of crown diameter is 0.8008,and the root mean square error RMSE of diameter is 0.8978.(3) The extraction rate of total crown area was 0.95,the accuracy rate was 0.93,and the F parameter was 0.94;(4) The relative error of canopy density precision was only 0.32 percent.Estimation of main parameters of plantation using UAV high spatial resolution data and a small amount of field survey data can replace the actual field survey of the whole forest,and has great application value in plantation forest survey.
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