Topographic Map Revision And Technical Studies,

Affected by the producing activities such as the engineering project constructions and the natural variance, the information in topographic maps is greatly different to the present practical conditions gradually. In this case, it is very important to study the methods how to update the topographic maps in time in order to keep the reliability. In this paper, we will analyze and study the technology of the acquiring and examining on the terrain feature data. The main jobs are as follows:1) Summarizing and analyzing the basic technology of the topographic map revision. Introducing the main course and method of the topographic map revision.2) Analyzing the course of choosing of the area and tendency at which the object stays in course of collecting data artificially and putting forward some semi-automatic collecting strategy feasibly.3) Analyzing the relationship between the graph gradient vector and the edge feature, putting forward the collecting algorithm of the edge feature based on the graph rotating degree or the graph gradient histogram.4) Putting forward the semi-automatic examining algorithm based on the general Hough transformation and the Fourier transformation according to the studying of the technology of the automatic examining of the vector data.5) The input controlling or the automatic examining of the property data with the property formwork according to the studying of the technology of the acquiring and examining of the ground feature property data.6) Analyzing the technology of the 3D visualization based on the irregular triangulation network and studying application of this technology on detection of object data.7) Designing the frame of the terrain graph revision system with the object-oriented and the module thought, and finishing the detail design and programming of the main module.