无人机航测技术在森林资源调查中的应用

摘要

In order to compare the traditional forest survey method and unmanned aerial vehicle(UAV)forest survey method,plots investigation and unmanned aerial vehicle flight investigation were respectively conducted in the Dunyang forest harvesting field,analyzed the aerial photogrammetry,and then extract the average height of the single tree,the crown and the average height of canopy from the digital surface model(DSM)and digital orthophoto map(DOM)builded,through the extraction of factors and plot survey data to establish the DBH-crown model: D＝12.07-5.41C+3.38C2-0.41C3,and then completed the estimation of single tree DBH of the test area,and finished the accuracy analysis of the above factor extraction.Compared with the traditional forest survey methods,UAV forest survey methods can be separated from the traditional site-based survey method,after the acquisition of images,in-house processing in the image within the scope of any need to investigate the region any number of times of the survey,the ability and efficiency of investigation are far more than the traditional forest survey method.%在福建省建瓯市墩阳林业采育场分别进行样地调查和无人机航测飞行试验,对传统森林资源调查法和无人机森林资源调查法进行对比,对无人机获取的影像数据进行处理,建立数字表面模型(DSM)和数字正射影像(DOM),从中提取单木的树高与冠幅、林冠的平均冠幅与平均高、样地的郁闭度与密度等因子,分析无人机航空摄影测量测树因子提取与预估模型建立的方法.结果表明,通过提取的因子和实地调查数据建立胸径-冠幅最优模型D＝12.07-5.41C+3.38C2-0.41C3,进而完成试验地区其他样地单木胸径的估测,并分析了各因子提取的精度.与传统森林资源调查法相比,无人机森林资源调查法可以脱离传统的依靠样地进行的现场调查,在获取影像后,可在内业处理中对影像范围内任意需要调查的区域进行任意次数的调查,调查能力和调查效率远优于传统森林资源调查法.