格网索引在数字地形图质量控制中的应用

Application of the gird index in digital topography quality control

针对数字地形图数据入库预处理效率较低的问题,该文提出了一种在AutoCAD扩展空间索引的方法。综合格网索引效率和创建难易程度,将其作为数字地形图数据质量控制系统中的索引方案;为了使得空间索引持久化,进一步提出了空间索引存储策略。将该方法在某县城镇地籍权属图形数据入库质量控制中进行应用,结果表明:在空间索引的支持下,数据预处理效率明显提高,且随着数据量增加,优势越明显。该索引方法在基于AutoCAD的数字测图软件中具有一定应用推广价值,有助于改善这些软件的数据处理性能。

This paper put forward a method of creating spatial Index in AutoCAD, which was used to resolve the problem that the efficiency of data preprocessing was too low. Analyzing the efficiency of the Grid Index and how difficult to build it, this paper selected it as the spatial index of the DLG data quality control system~ and in order to keep its permanence, a kind of data stored scheme was brought out for it. The research result was applied into quality control of cadastral ownership graphical data storage of one town. The test results showed that the data preprocessing efficiency had significantly been improved by the support of the spatial index compared with the tradition; and the advantage of the spatial index will be more obvious along with the amount of data increasing. It has application value in CAD-based digital map- ping software, and then will improve the data processing performance of those pieces of software.