矢量GIS平面线状实体误差模型概率特征

从概率论的角度看,矢量GIS平面线状实体落入其相应误差模型内的概率值是决定线状实体误差模型规模的依据。根据等概率密度误差模型建模机理、概率论与数理统计以及数值分析,文献1]、3]、4]研究了矢量GIS平面线状实体落入其相应等概率密度误差模型内的概率算法,在此基础上,文中对概率特征进行了总结和分析,得出了"线状实体落入其相应等概率密度误差模型内的概率不仅与线状实体上点位精度最低的特征点"标准误差椭圆缩放系数"有关,而且还随特征点精度的变化而变化"的结论。实例计算与分析验证了该结论的正确性。

Probability characteristic for the equivalent probability density error model of 2D generic curve in vector GIS

The computation value of the probability that 2D linear entity in vector GIS is located within its corresponding error model is a critical indicator used to determine the size of an error model.The probabilistic algorithm on 2D linear entity in vector GIS located within corresponding the equivalent probability density error model(Tepdem) is proposed based on the modeling theory of Tepdem and Probability Theory as well as Numerical Solutions.In this paper the probability characteristic is summarized and analyzed,and some conclusions are concluded,namely,the probability on 2D linear entity in vector GIS located within corresponding Tepdem is not only correlated to the standard error ellipse shrink or expansion coefficient,but also changed with the variety of the characteristic points precision.At last study and analysis of the case validates the conclusions.