"3D Measure models of electronic maps based on DEM"

It is often necessary to measure characteristics of map feature in maps. The characteristics contains coordinate, angle, length, distance, area, cubage, slope, density, gradient and intensity, etc.. Aiming at problem of difficulty for 3D measure maps elements in ordinarily electronic maps, the idea of electronic maps based on DEM is brought forward. The maps make 3D DEM and 2D electronic maps to vertically integrate, and to take advantage of each other, and to advance spatial representing map measure ability of electronic maps, and to strengthen application potential of DEM. Method of vertically integrating grid DEM and electronic maps is researched, and 3D measure models of electronic maps based on grid DEM is studied. The powerful data processing ability of computer has created excellent conditions for application of model methods. It is an important aspect of cartology study to establish and apply good model. That can promote accuracy and speed of map measure, can promote the application of depth analysis of maps information and can exert the benefit of maps better.