Digital Mapping System In Mappingstar Three-dimensional Digital Terrain Map Updates

In this paper, the principles and methods of digital image rectification based on digital photogrammetrical mapping system and the overlay of rectified stereo images with raster data or vector map data are described. Further more, under the platform of digital photogrammetrical system, the quick updating of 3D stereo digital relief map is realized.First, the basic principles of geometry rectification of digital aerial images and raster relief map are introduced and thus the accuracy of geometry rectification is improved.Secondly, several methods of updating relief map are analyzed and thefunctionalities and characteristics of digital photogrammetrical system areintroduced. Combine with the task of producing 1:50000 basic frame map, acomplete working process of updating 3D digital relief map based on"MappinStar digital mapping system" is summarized.And then, with some group of data, the feasibility of the task process has been proved. The comparing results also show the way to optimizing working method and improving working efficiency and product quality.The experiments prove that the method of updating 3D stereo digital relief map based on digital photogrammetical mapping system is a brand new method, which has some excellent characteristics: quick working speed, shortened produce period and high accuracy.