在GIS线元的位置不确定性方面，国内外学者已提出了“e-带”、“e-带”、“g-带”、“H-带”等模型，然而就应用而言，由于“e-带”具有不变带宽，因而应用最为广泛。但是“e-带”的宽度往往难以确定，从而限制了它的使用范围。在“H-带”的基础上，提出了根据线元的平均信息熵确定“e-带”宽度的思想，建立了线元的平均熵不确定带，并以此作为线元位置不确定性的度量。

Spatial data is one of the fundamental parts of GIS.Uncertainty of spatial data can directly affect the quality of digital products and reliability of GIS-based decision-making and is regarded as one of the fundamental theoretical research issues. In recent years，positional uncertainty of line segments is a research focus. Several models have been presented by other scholars，for exampleε-band，e-band，g-band，and H-band.Among these existing models，theε-band has been widely used due to its advantage of fixed band-width. But it is difficult to determine the band-width，which limits its further application. In this paper，we expand the model of H-band in literature［4］and present an uncertainty band of average entropy based on average information entropy of the whole line segment. The new model absorbs the strongpoint of ε-band and at the same time takes the asymmetry of error distribution in line segment into consideration. It is a comparatively suitable measurement index of the positional uncertainty of line segments.