Abstract
There is an increasing demand for terrain information in digital form in addition to graphical format. Under such circumstances the establishment of a national digital topographic data base can be envisaged and implemented to serve the needs for terrain data in either digital and/or graphical format. This paper discusses the digital interactive photogrammetric data acquisition system, interactive cartographic editing and automated drafting. The concepts of digital topographic data bank and data base are discussed as well as the requirements for selective retrieval and data base query language capability.
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