地理边线的不一致性是GIS多源空间数据集成、建库和分析中的常见问题。首先分析了地理边线不一致性的类型,并归结为顶点数目完全和不完全匹配两种情况,其中前者可以直接利用结点广义捕捉算法处理。为了匹配后者的顶点数目,提出了投影配点的标准化处理,并导出了投影点的坐标计算和误差估计公式。此外,还导出了一致化改正后地理边线长度的误差估计公式。最后通过算例说明所提出方法的实现过程。

Data quality in spatial databases has been widely recognized as one of the most critical issues in GIS. Its key dimension is assessing data suitability, including data accuracy, precision, uncertainty, compatibility, consistency, completeness, availability and timeliness recorded in the data lineage. Over decades, data quality has attracted much attention in the GIS community, and various aspects of data quality have been investigated. However, research on topological consistency remains very weak though it is crucial for GIS spatial analysis. This paper proposes a new technique on handling topological consistencies as well as tracing error propagation. First, inconsistencies of digital geographic lines are categorized into two groups with or without equal numbers of vertexes. Then a standard formalizing approach has been introduced to make numbers of vertexes matched in the two poly-lines so that the generalized algorithm of node snapping can be used to remove the inconsistencies between the two poly-lines. Third, the equations of estimating the coordinates of the projected points and their errors in the process of standard formalization have been derived. The formulae of calculating the length, together with its accuracy, of new generated poly-lines have also been obtained. Finally, simple examples are provided to demonstrate how to implement the proposed technique into practice.