Analysis And Research Of Mapping With Coordination Data

The information of local terrain and environment is important in both civilian and military construction, making the design scheme of projects reasonable. The information is generally provided by topographical map, according to which, the planar position and altitude of the building can also be calculated. In a word, the topographical map is the basic material in the whole project.During the course of plotting and editing the digital topographic maps, some problems come out. Firstly, the redundant and erroneous discrete points should be removed after gathering the data through GPS and Total Station. Secondly, the digital terrain model (DTM) is build using constrained triangle irregular network (TIN) to make the model tally with the real terrain well. Thirdly, the features and relief should be plotted accurately with least or even no factitious intervention. Currently, a mass of subsequent work was done by the operator after plotting the contour with software.This paper puts forward a new method, in which the code is added so the redundant and erroneous discrete points are removed automatically without any factitious intervention. Based on this method, the features and relief can be plotted simultaneously using constrained Delaunay triangulation. In addition, the mapping efficiency and accuracy are improved greatly.