While the large scale terrain simulation which is based on TIN DEM can describe complex terrain environment in detail,it is more difficult for it to construct models,render scenes in real time than the small scale terrain simulation which is based on Grid DEM.

Taking the site surveying of Nongan Sangang observation station for 1∶500 topographic map as an example,this paper discussed the technical problem on small area large scale topographic map field surveyi.

This paper makes a study on the interactive digital generalization,and an interactive map generalization environment for large scale topographic map is then designed and realized.

This paper mainly discusses the classification,the structure and the design related to large-scale topographic map symbols.

this pape, several kinds of simple and convenient methods of computeraided digittizing for large-scale topographic map are recommended.

In this paper,a method is presented for large scale topographical map measurements in digital by aerophotogrammetric field operation with GPS RTK.

Aimed at S/M for digital topographic map of especially big scale,several accurate methods and special measure of S/M is put forward to meet the need of special users.

Along with the establishment of modern surveying and mapping system, which is characterized by technologies of remote sensing, global positioning system and geographical information system, the large scale topographic survey has an enormous changes in technical methods, product styles and applications.