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根据最小二乘原理 ,本文提出了结点捕捉的一种广义算法 ,并建立了伴随的误差传播模型。针对位于模糊公差范围内待捕捉点组中各点坐标误差统计特性的各种可能的特殊情况 ,进一步导出了相应的简化算法及其误差传播模型 ,并从理论和数值模拟两方面系统地分析了结点坐标的相关性对捕捉结果的影响。理论推导表明 ,现有的 GIS结点捕捉算法属广义算法的一种特殊情况。最后通过算例说明了广义算法和误差传播模型的实际应用前景。

Data quality in GIS has been widely recognized as one of the most critical issues in GIS applications in recent years. There are numerous effective error models for managing error propagation in the process of data manipulation and analysis such as Boolean operations. However, there is a lack of models for dealing with errors in node snapping which is one of the basic operations in most GIS software packages such as ARCEDIT in ARC/INFO. Node snapping involves changing the position of point...