GPS在森林资源清查中的应用

The Application of GPS in Forest Resource Inventory

在介绍地理坐标基本知识的基础上,阐述大地坐标与平面坐标转换参数的测定方法,介绍了GPS在森林资源清查中的应用,并以GARMINGPSETREX仪为例,分析了GPS定位、导航、求积的精度,以及提高GPS精度的方法。结果表明,在同一投影分带内,利用GARMINGPSETREX仪,采用3个以上三角控制水准点测定大地坐标与平面坐标的转换参数,可满足森林资源清查的定位、导航精度;在调查面积大于3hm2时,可满足森林资源清查的求积精度,且面积越大,精度越高。

In order that the GPS could be used adroitly and the investigate precisions could be improved in forest resource inventory,based on the introduction of the basal knowledge of geography coordinate,this paper has represented the method transform parameter one another between the mother earth coordinate and the plane coordinate;expatiated the applied instance of the GPS in forest resource inventory;analyzed the precisions of orientation,navigation and quadrature with GPS,as well as some noticed proceedings for heightening the precisions,by exemplifying GARMIN GPS ETREX.The conclusion has been brought forward that in the same projection zone,the transform parameter of the mother earth coordinate and the plane coordinate determined with more than three triangle control water points,can satisfy the precisions of orientation and navigation, can satisfy the quadrature precision on condition that the investigated area is more than 3 hm^2,in forest resource inventory,with GARMIN GPS ETREX;the bigger the area is,the higher the precision is.