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中文摘要：
考虑实用性和合理性，将线元看成离散点的集合，将线的不确定性看成点的不确定性的聚合体，将线元的位置不确定性模型看成以各点误差椭圆的长半轴E为半径的误差圆的聚合体，建立了以线元上任意点处的误差椭圆的长半轴E为带宽的线元不确定性εE模型。给出了基于该模型衡量线元位置不确定性的三种度量指标：可视化图形、平均误差带宽和误差带的面积。最后，将该模型与岛模型和εE模型进行了比较。
英文摘要：
Firstly, we propose a new model named εE model to measure line segments positional uncertainty, which consider the semi long axis of the error ellipse at any point on the line segment as the width of the error band, that is, the positional uncertainty of line segment is considered as a set of error circles with the radius of the error ellipse＇s semi long-axis at any point on the line. Secondly, the analytic expressions of the error band boundary line for the εE model of line segment are deduced, the parameter equations of the error band boundary are gotten. Thirdly, three indexes are given to measure the precision of the line uncertainty based on the εE model： the visualization graph, the average error band width and the error band area. At last, the εE model is compared with the εE model and the εE model. Theory and practice show that εE model is simple in calculation but too limited in the error band width, st. model is scientific in theory but complex in calculation, and model is scientific in theory and convenient in practice though over width in the error band width.
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