摘要
为了研究像素当量法在立木材积测算中的应用,根据智能手机拍摄的立木像片,采用像素当量法并运用区分段不等长的中央断面区分求积式测算了银杏立木材积,并分析了不同摄影方位和不同区分段数对立木材积精度的影响。结果显示,随着观测方位数量的增加,立木材积相对误差的绝对值在减小,其中,根据两个互相垂直方位拍摄的像片测算的立木材积相对误差小于1.5%;同时,随着区分段数的增加,立木材积相对误差的绝对值在减小。当区分段在5~8段时,立木材积相对误差绝对值均在1.4%以内。这就表明:在用像素当量法精确测算立木材积时,至少需要采用两个互相垂直的方位拍摄立木像片,且区分段数定为5~8段左右为宜。
In order to study the application of the pixel equivalent method in the measuresure of standing volume,the standing volume of ginkgo trees is measured by the pixel equivalent method and the sectional measurement of central sections with the unequal length of segments according to the photos of standing trees taken by smart-phones,and the effects of the number of different photographic orientations and different sections on the accuracy of standing volume are analyzed.The results reveal that the absolute value of the relative error of standing volume decreases with the increase of the number of photographic orientations,among which,the relative error of the standing volume measured by photos taken from two mutually-perpendicular orientations is less than 1.5%,and that the absolute value of the relative error of standing volume decreases with the increase of the number of sec-tions,and the absolute value of the relative error of standing volume is within 1.4%when the number of sections is 5~8,which shows that it is necessary to use at least two mutually-perpendicular orientations to take the photos of standing trees and the number of sections should be at 5~8 when accurately measuring standing volume by the pixel equivalent method.
作者
赵浩彦
张民侠
张雷
ZHAO Haoyan;ZHANG Minxia;ZHANG Lei(Nanjing Police University,Nanjing,Jiangsu Province,210023 China)
出处
《科技资讯》
2024年第12期150-153,共4页
Science & Technology Information
基金
2020年度公安部技术研究计划基科费项目“基于手机摄影的两种测量技术在森林案件鉴定中的应用研究”(项目编号:2020JSYJC28)。
关键词
像素当量法
立木
中央断面区分求积式
材积
Pixel equivalent method
Standing tree
Sectional measurement of central sections
Volume
