无伐倒活立木材积精准计测原理与试验-论文.pdf

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1、第34卷第5期中南林业科技大学学报V．01．34No．52014年5月JournalofCentralSouthUniversityofForestry&TechnologyMav2014无伐倒活立木材积精准计测原理与试验贾振轩。，冯仲科，焦有权，徐伟恒，高原，樊江川(1．北京林业大学测绘与3S研究中心，北京100083；2．北京农业职业学院，北京1024423．西南林业大学计算机与信息学院，云南昆明650224)摘要：针对立木伐倒后精测材积的现状，以光电经纬仪为主要测量工具，辅以专用软件，形成光电经纬仪测树系统，外业利用光电经纬仪精密的测角功能，配合人工精确量取地径和胸径，内业部分利用

2、专业软件获得树干的胸径、树高和任意处直径，进而计算材积。在对99株中林系列108杨统计分析发现，光电经纬仪精准计测的材积样本均方差=0．1303，ami=0．0013，各组变量的分布比较集中，离散小，同时Cv值偏小，Cs绝对值较小，且正偏与负偏相当；同时用407株中395株中林系列107杨的实测材积，建立了二元材积模型，并用12株实测材积进行模型验证，材积最大误差率绝对值为10．1％，最小为2．3％，满足森林计测的误差要求。关键词：无伐倒活立木材积法；精准计测原理；光电经纬仪中图分类号：$758文献标志码：A文章编号：1673．923X(2014)05—0031-06Accurateme

3、asurementprincipleandexperimentoftimbervolumebyno-felledstandingtreemethodJIAZhen—xuan，FENGZhong．ke，JIAOYou．quart，，XUWei-heng’，GAOYuan，FANJiang—chuan(1．InstituteofGIS，RS&GPS，BeijingForestryUniversity,Beijing100083，China；2．BeijingVocationalCollegeofAgriculture，Beijing102442，China；3．CollegeofComput

4、erandInformationEngineering，SouthwestForestryUniversity,Kunming650224，Yunnan，China)Abstract：Forthecurrentsituationthatthetimbervolumeprecisionmeasurementwasconductedbythefelledstandingtreemethod，theaccuratemeasurementprincipleandexperimentoftimbervolumebyno—felledstandingtreemethodhasbeencarriedo

5、ut．Combiningphotoelectrictheodolite，microcomputeranddedicatedsoftware，atreemeasuringsystemwasformed．Theelevationanglesoffleesweremeasuredbythephotoelectrictheodolite，thebasaldiameteranddiameteratbreastheightoftreesweremeasuredthroughmanual，andthediameteratbreastheight．treeheightanddiameteratanywh

6、ereoftrunkwereobtainedwiththededicatedsoftwarebyindooroperation，thenthetimbervolumewascalculated．Thestatisticalanalyseson99flees(Poplar108)belongingtoZhonglinSerieswereconducted，theresultsshowedthatthemeasuredmeansquareerrorsofvolumesampleswere“=0．1303，am。0．0013，thevariabledistributionofthegroups

7、concentratedrelatively,thediscretedegreeweresmall，valuewaslessthannormal，csabsolutevaluewassmaller,whilethepositivebiasandnegativebiasisequal；basedonthemeasuredvolumevaluesof393treesofPoplar107from407treesbelongingtoZh