无人机遥感技术可为林木冠幅获取提供一种快速测量的方法。以东台市林场为研究区,人工实测杨树人工林样地的单木冠幅值,利用无人机遥感技术航测获取对应杨树样地的高清影像图,采用Agisoft PhotoScan软件对样地影像图进行拼接建模,并结合ENVI软件快速提取样地单木冠幅值,对比两种方法所获得的冠幅值并进行拟合得到线性回归模型,二者相关系数R=0.89,均方根误差RMSE=0.60,相对误差RE%=7.93%,模型拟合效果较好。结果表明,通过无人机遥感技术进行林分单木冠幅测量具有可行性,且估测精度较高,与人工实地测量相比,成本较低、耗时较短、灵活性较高,具备一定的工作优势,值得被广泛推广。

UAV remote sensing technology provides a fast measurement method for forest crown acquisition.Taking the Dongtai Forest Farm as the research area,we manually measured the single-wood crown amplitude of the poplar plantation plot,used the UAV remote sensing technology aerial survey to obtain the high-definition image map corresponding to the poplar plot and used Agisoft PhotoScan software to sample the image.The splicing modeling was carried out,and the amplitude of the single-wood crown of the sample was quickly extracted by using ENVI software.The crown amplitude values obtained by the two methods were compared and fitted to obtain a linear regression model.The correlation coefficient of the two was R=0.89,the root mean square error.RMSE=0.60,relative error RE%=7.93%,the model fitting effect is better.The results show that it is feasible to measure the single-wood crown by the remote sensing technology of the drone,and the estimation accuracy is high.Compared with the manual field measurement,the cost is lower,the time is shorter,and the flexibility is higher.Certain work advantages are worthy of being widely promoted.