GIS线要素不确定性模型的进一步探讨

THE MORE DISCUSSION TO THE MODELING UNCERTAINTY OF LINE PRIMITIVES IN GIS

本文在文献［１］、［２］的基础上，对线段的位置不确定性模型做了适当改进。一是考虑线段两端点之间相关且不一定等精度的情况。二是考虑到误差分布的方向性，提出更严密准确的ε带宽模型。实例计算说明，严密模型与［１］、［２］中给出的模型相差不大，当两端点等精度时，实用上可以采用［１］、［２］中给出的模型。

On the basis of the paper、,this paper put forward a modified model for linear positional uncertainty. It considers two situations: One is that the two points of line are relevant and have different precision. The other is that distribution of error have certain direction. On the condition of that, it makes a more close and accurate εBand width. Through examples, it is proved that the accurate model is little different from, which is given in the paper、. When two points have the equal error, the model given in the paper 、 can be used into practice.