校正地基摄影获取树枝倾角  

Correction of photogrammetry for angle of branch

作　　者：李雷[1] 孟治国[1] 郑兴明[2,3] 赵凯[2,3] 李晓洁[2,3] 李晓峰 LI Lei;MENG Zhiguo;ZHENG Xingming;ZHAO Kai;LI Xiaojie;LI Xiaofeng(College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;Changchun Jingyuetan Remote Sensing Test Site, Chinese Academy of Sciences, Changchun 130102, China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]中国科学院东北地理与农业生态研究所,长春130102 [3]中国科学院长春净月潭遥感实验站,长春130102

出　　处：《测绘科学》2018年第5期109-114,共6页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41371332;41301369;41501408);科技基础性工作专项(2014FY210800-4);吉林大学研究生创新基金资助项目(2016202)

摘　　要：针对传统树枝倾角测量方法的复杂性和精度低的问题,该文提出了通过校正地基摄影获取树枝倾角的方法。基于投影变换和小孔成像原理,通过自制树枝模型的方法,分析了直接图上量取树枝倾角与真实值之间误差的成因,提出了基于投影变化的树枝倾角计算公式。结果表明:该研究获取树枝倾角的相对误差2.72%明显优于传统测量的31.33%,同时随拍摄距离变化,树枝倾角估算结果具有稳定性。该研究方法简单、有效,非常适合复杂环境下树枝倾角的大量提取,并提出了一种基于摄影成像原理获取树枝倾角的方法,发展了树枝倾角测量系统软件,提高测量精度并降低了测量难度。In order to solve the problem of complexity and low precision of the traditional method for measuring the branch angle,a method of obtaining the inclination of the tree is proposed.Based on the principle of projection transformation and pinhole imaging,by analyzing the error between branch angle measured directly on the image and the real branch angle which is measured on the self-made branch model,then the calculation formula which is based on the projection transformation is put forward.The results showed that the relative error of the proposed method is 2.72%,which is better than the traditional method＇s 31.33%,for the same time,with the change of the shooting distance,the estimation results of the angle are stable.This method is simple and effective and it is very suitable for the extraction of a large number of complex environment branch angle,and a method of obtaining branch angle based on the photographic imaging principle is proposed;besides,the software of the branch angle measurement system is developed and improve precision and reduce the measurement difficulty.

关 键 词：树枝倾角 摄影 投影变形 误差分析 数字图像 

分 类 号：P232[天文地球—摄影测量与遥感]