如何评价林地斑块(小班)边界定位(勾绘)质量,是很多林业检查、验收工作遇到的问题。现行做法只采用面积精度一个指标进行评定,不能反映斑块边界空间定位的准确性。为此,文中分析了斑块边界定位情况,定义了斑块空间平面定位精度的指标——斑块重叠率,并给出了计算方法。该指标与面积精度指标联合应用,可全面、准确地衡量小班勾绘的质量情况。通过案例分析,认为在森林资源规划设计调查小班质量检查中,斑块重叠率达到85%以上即可。

How to assess the accuracy of forest land patch (sub-compartment) delineation is a key point in many tasks of inspection and evaluation in forestry.Area accuracy was usually used as the only indicator to assess the quality of patch delineation,but it could not represent the accuracy of spatial positioning of the sub-compartment.Therefore,this paper analyzed the typical cases of patch borderline positioning,then defined the patch overlap rate used to represent the overlap between reference polygon and inventory polygon,and proposed its calculation method.Using the overlap rate together with the area accuracy,the accuracy of patch positioning could be evaluated much more accurately and objectively.A case study indicated that if the overlap rate is greater than 85%,the patch delineation could be recognized as qualified in forest management inventory.