Base surveying is the basis of all special surveying,and is developing to special surveying,which is not only the demand of widening the operation fields,but is also the demand of data updating.

• 基础测绘是一切专业测绘的基础,基础测绘向专业测绘的发展,既是进一步拓展业务领域的需要,也是从根本上解决基础测绘成果数据更新的需要。