POSITIONAL ERROR CURVES BAND OF A PLANAR LINE SEGMENT WITHIN GISs

In this paper, the positional error curve of point features was extended to an error curves band of line segment features. Firstly, the constitution and shape of the error curves band were analyzed. On this basis, the general boundary curve formula of that band was derived. Secondly, the visualizing error curves bands were realized through three exam- ples. Finally,area index has been examined by comparing numerical results from error curves band and error ellipes band.

GIS中平面线位误差带的可视化表达

通过综述ＧＩＳ中平面线位误差带的发展历程，根据求解曲线族包络线的原理，建立了描述随机线元位置不确定性的误差带“ｇ—带”边界曲线方程的计算通式，从图形角度详细阐述了“ｇ—带”的形成、形状确定，并给出不同实例的“ｇ—带”可视化图形，直观地向用户展示了线位整体不确定性的区域范围。