地质制图中CASS到MapGIS数据无缝自动转换的实现

Seamless Automatic Conversion of Geological Data from CASS to MapGIS

长期以来,国内流行的数字测图软件南方CASS与地质部门使用的MapGIS软件在数据交换时存在很大的障碍,给地质、国土等很多部门用户的工作带来诸多不便。本文从实际应用的角度出发,深入探讨了两者的数据格式特点,编写了读取转换数据代码,将CASS图中实体类型细分为点、线、面、文字、块,然后分别转换为MapGIS中的点、线、面、文字、子图。本研究实现了两种数据的无缝自动转换,最大限度地减少了转换过程中的数据丢失,并在内蒙古包头哈不沁铁矿地形图的转换实践中得以检验。

With the development of the domestic GIS technology, the geographical information systems are widely used in various domestic industries. The south CASS data format is mainly used in digital surveying and mapping, along with the GIS technology. To reduce the cost of the GIS application system and to improve the GIS system efficiency, the timely updating of the GIS data and the geological and mineral resources is of great significance. The MapGIS software is often used in the geological fields, but the CASS software is often used in digital surveying and mapping, and their data formats are quite different.. In view of practical applications, this paper discusses the formats of the data characteristics and the conversion method between CASS and MapGIS. To read the CASS data, the CASS diagram entity types are subdivided into point, line, surface, text, and block. Then the data are converted to the MapGIS format as dot, line, face, text, and sub graph. In the conversion practice for the Inner Mongolia Baotou Habuqin iron mine topographic map, the automatic conversion of the two kinds of data formats are realized and the data loss is reduced in the process of conversion.