Research On Key Technologies Of Constructing Fine City Digital Elevation Model

The surface of city ground is the synthesis of natural and artificial modification s tructures entity. Digital Elevation Model is a digital description to realize the surface morphology by regular discrete grid sampling data. Urban Digital Elevation Model is t he description of spatial fluctuations of the city surface features on fine scale(natural undulating terrain,roads,buildings,water base ect.). Urban Digital Elevation Model is the key basic geographic data to realize of city rain and flood simulation, pollutanttracin g, sunlight analysis, wind analysis ect.applications. The traditional construction DEM m odel technology is difficult to realize the city digital topographic expression on fine sc ale, which become the constraints of city surface process simulation analysis of bottle neck. In view of this, this subject use geography, surveying and mapping and the DE M digital terrain analysis as the theoretical basis, research on the methods of construct ing city fine digital elevation model.By compare and analysis the existing GIS and D EM data organization methods, using the partitioning building idea to complete the cit y fine digital elevation model construction, that is,city road as the regional boundarie s,divide the whole city into different small areas, chose the suitable interpolation meth od to construct the different small areas, finally, let each small region model seamless fusion. at the same time, taking the 1:500 topographic map as the background data, and research the segmentation method of the city ground areas, establish the city fine digital partition inserted model which considering city natural terrain, artificial dressin g features of terrain as characteristics zone. Through the above research, the establish ment technology of partition construction by using U-DEM data organization model,to realize the 1:500 scale city fine digital elevation model building, the breakthrough of t he theory and methods about this study can not only realize the city’s surface fine dig ital simulation, but also provide theory and reference method for integrated modeling,which is widely distributed in the geographical space of city natural terrain, artificial dressing features of terrain as characteristics zone, it has great significance.This article has conducted the concrete research on the construction of city fine d igital elevation model, the main work include:(1) introduced the city fine digital elevation model technique proposed background,research significance, research status, research goal and research content.(2) describes the basic research on construction of urban digital elevation model f ine when the study area, including the selecting principle, experimental data introducti on, experimental data pretreatment and the method and route of technology.(3) put forward the concept of urban fine digital elevation model, and focus on t he construction of the model construction method is proposed with the specific.(4) for the construction of quality evaluation of good urban digital elevation mod el results are fine.(5) introduces design and function realization of prototype system, including the d evelopment environment, design requirements, function design and interface.(6) finally, in view of the research process of this paper, the paper prospects the future work and study summary.