Based On Gis And Vba Highway Cad Technology Application Research

Researches of highway CAD technique aim at designing highway with guidance of scientific development views, sticking to human centered, and along the development way of economizing resource. This is the only way to realize all-around harmonious sustainable development of highway traffic. In the information era, the efficiency, quality and scientificity of highway design and layout are required to improve by idea of new generation highway. The traditional technique structure of highway design and layout is rebuilt to realize the automatization of highway survey and design.According to needs of highway design technique development, researches on the application of new technique such as planar GIS, VGE and second development of AutoCAD (VBA) in highway aided design are completed.Here is the main work of the dissertation:1. Decision support for highway net planning and route-choosing is provided through retrievaling and analysising distribution of villages, towns, rivers, highway net and relevant information of highways built and being planed. Vectorization of highway map is completed by virtue of MapInfo professional, and attribute database built. Highway GIS is developed on the basis of MapX component technique. Two key problems in system development, integration of spatial object and its attribute data and incorporation of vector data and raster data, are resolved.2. In order to assess design effect of highway, a scheme suitable for engineering application is introduced. Vectorization of terrain map is finished in AutoCAD, and then three dimensions visual DEM is built in ArcGIS, main body model of road is made from road design data with developing in ArcObjects and manual editing. Such three dimension entities as houses, structures, affiliated establish are modeled in 3DMAX and AutoCAD, highway scene made, finally roam and simulation of car travelling are realized in ArcScene.3. With the insufficient function of the development tool (VBA) embedded in AutoCAD, the function of VBA is expanded by virtue of AutoLISP language and Delphi development tool. Several key problems in development of highway ichnography aided drawing system are solved, such as the coordinate...