Digital Mapping Mapping System Design And Implementation

Map is a common language in science and technology is one of information carriers. People often want to draw all kinds of pictures to deliver him of design idea, to have intercourse with others, to instruct production.With the development of science and technology, some hardware such as GPS, total-station and computer provide powerful physical holder for digital mapping. Surveying technology has converted from simulation to digital, intellectualized and roboticized model.This paper analyzes the actuality of digital mapping and the hold function of the software of digital mapping at first. And then makes certain the coding of objects according to the national criterion, and divides all objects into three kinds: points, line and plane, then tells how to do and manage the warehouse of symbols, linetypes and pattern. It discusses the arithmetic of drawing the contour lines in a plane emphatically, introduces the method of drawing the contour lines using TIN, and discusses the matters those are often countered in practice. At last, this paper narrates several issues, they are conversion of data structure, conversion of coordinate system, cutting out and disparting of map, the management of layer and applied calculation.This system takes AutoCAD 2002 , a software that widely used at present, as the flat roof, takes Microsoft's Visual Basic as programmed language. It looks AutoCAD as a figure window; it can open, draw, edit, print and close it by programming. This system realizes the basic edit function and some functions in common use.