青海云杉天然次生林区DGPS定位精度分析  

Analysis on DGPS Positioning Accuracy in Natural Secondary Forests of Picea crassifolia

作　　者：刘清旺[1] 李增元[1] 陈尔学[1] 曹斌[1] 白黎娜[1] 

机构地区：[1]中国林业科学研究院资源信息研究所,北京100091

出　　处：《林业资源管理》2009年第6期107-112,共6页Forest Resources Management

基　　金：国家973课题(2007CB714404);中央级公益性科研院所基本科研业务费专项资金(IFRIT200803)

摘　　要：黑河综合遥感联合试验是针对地球表层系统科学中存在的科学问题而开展的大型观测试验,其中森林水文试验区位于祁连山水源涵养林大野口生态站,森林类型为青海云杉天然次生林。为了对同步获取的航空—卫星遥感观测数据与地面观测数据进行位置匹配,采用DGPS和全站仪分别进行独立观测,以全站仪观测结果作为参考数据,对DGPS在林地内的定位精度进行分析与评价。结果表明,单频和双频差分处理精度类似,观测时卫星数和PDOP不能反映定位精度,影响定位精度的主要因素是林分郁闭情况,定位精度从亚米级变化到米级。The Watershed Allied Telemetry Experimental Research（WATER） is a large scale observation experiment designed to resolve the scientific questions of earth surface system science,which includes the forest hydrology experiment located at the Dayekou ecoligical station of water source conservation forest in Qilian Mountains.The forest type is the secondary natural forests of Picea crassifolia.In order to match the data simultaneously acquired through airborne or satellite-borne observations and field-based observations,the research adopted independent observations by using the DGPS and the Total Station respectively.The Total Station observations were used as reference values,and used for analyzing and assessing the DGPS positioning accuracy in forests.The result shows that the differential process accuracy of single frequency is similar to the differential process accuracy of double frequency.The satellite number or PDOP values doesn＇t reflect the positioning accuracy while the closure is the major influence factor.The positioning accuracy level varies from sub-meter to meter.

关 键 词：黑河流域 天然次生林 青海云杉 DGPS 全站仪 

分 类 号：P228.4[天文地球—大地测量学与测量工程]