Digital topographic map in CAD format is an important data source for applications and development of GIS. However,the spatial reference information,which is the location basis of GIS data,is always neglected in CAD files.
地形图CAD数据是GIS应用与开发的重要数据源,而相应空间参考缺失的情况却并不鲜见。
参考来源 - CAD数据空间参考的判断与参数获取·2,447,543篇论文数据，部分数据来源于NoteExpress
The ellipsoid model is the first part of a spatial reference system definition.
椭圆体模型是空间引用系统定义的第一部分。
The second is that ArcExplorer requires all spatial columns to have a single spatial reference system assigned.
第二件事情是 ArcExplorer 要求所有空间列指定一个空间引用系统。
Conclusion: The spatial reference memory and spatial working memory are reliable methods to examine AD model.
结论：空间参考记忆和空间工作记忆是检测ad模型的可靠方法。
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