基于航空影像的沙漠典型灌木数字测量  

Digital Measurement for Typical Desert Shrubs Based on Aerial Images

作　　者：胥利红[1] 李凤日[1] 

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2009年第9期86-90,共5页Journal of Northeast Forestry University

基　　金：科技部社会公益专项资金项目(2005DIB5J142);国家自然科学基金国际合作项目(30510103195)

摘　　要：基于内蒙古乌兰布和沙漠拍摄的1∶5000数字航空相片,利用全数字摄影测量工作站VirtuoZo系统IGS数字测图方法,选择研究区具有典型代表性的稀少且呈群团状的灌木白刺(Nitraria tangutorum)为对象,在建立的立体像对上进行测量,获得了沙丘上白刺高度、东西直径、南北直径、面积、周长和覆盖度6个因子的内业图测数据,并与外业实测数据进行了比较:面积的精度为71.7%,其他5项均大于90%,精度较高;同时分析了内业测图误差原因。结果表明:利用航片进行沙漠地区三维立体植被测量方法可行,内业测量精度达到了林业调查的要求。太阳方位角和判读员的经验是影响测量精度的主要因素。A method of digital mapping was discussed by using the VirtuoZo system of all-digital photogrammetry workstation based on 1 ： 5 000 digital aerial photographs of Ulan Buh Desert in Inner Mongolia. Typical desert species of shrub, Nitraria tangutorum, was selected for measuring the generated image stereo pairs. And indoor mapping measurement data of six indexes, including height, east-west and north-south diameters, area, perimeter, and degree of coverage, were obtained and compared with the outdoor measured data. The precision of area was 71.7 percent, and the precisions of other five indexes were all more than 90 percent. Moreover, the reasons for indoor mapping error were analyzed. Results show that the method for three-dimensional vegetation measurement in desert region is feasible using aerial photographs, and the indoor measurement accuracy could meet the requirement of forest survey ; while solar azimuth angle and the experience of interpreters are the major factors affecting the accuracy.

关 键 词：VIRTUOZO 立体像对 IGS数字测图 白刺(Nitraria tangutorum) 

分 类 号：S771.5[农业科学—森林工程]