手杖式测树仪研制与试验

Research and Experiment of Dendrometer with Walking Stick

为了在森林资源调查中能够便捷、快速、精准、高效地获取立木胸径和树高,设计研发了一种手杖式测树仪,其以固定长度手杖为主体,搭载智能手机和测树软件。该设备在传统林业调查装备理论的基础上利用了测树学、摄影测量学、机械加工学、机器视觉、影像处理等技术,通过智能手机影像处理软件实现了胸径的自动识别、测量、记录,并通过手动截取完整立木与所得胸径值演算树高等功能,可以统一编辑、存储、导出最终所得胸径树高。分析结果表明,该手杖式测树仪所得胸径和树高的编差Bias分别为0.29、0.48 cm,相对误差Bias%为1.5%、4.2%,RMSE均为0.70 cm,相对RMSE%为3.6%、6.1%,基本满足二类调查A类精度要求,具有一定的应用价值和推广潜力。

In order to obtain the diameter breast height(DBH)and tree height of the standing timber easily,quickly,accurately and efficiently in the forest resource survey,this paper designed and developed a portable dendrometer measuring instrument with a fixed length stick as the main body and equipped with intelligence mobile phone and tree measurement software.Based on the traditional forestry survey equipment theory,the equipment utilized tree measurement,photogrammetry,machining,machine vision,image processing and other technologies to realize automatic identification,measurement of breast diameter,record and manually intercept the complete standing tree and obtain DBH calculus tree height function etc by image processing software in smartphones.It could edit,store and export the final obtained DBH and tree height.Analysis results showed that the error of the breast diameter and tree height of the portable dendrometer was 24.9 and 0.48 cm,the relative error Bias%was 1.5%,4.2%,and the root mean square error RMSE both was 0.70 cm.The RMSE%was 3.6%and 6.09%,respectively,which basically met the a thpe accuracy requirements of the second type of survey,and had certain application value and promotion potential.