| With the developing of our country's highway, the number of the various road is more and more. So the Survey and Design task of road is increasingly arduous. The traditional method is that outside surveying and inside designing are separated. Which resulted in reducing efficience and much more data of surveying and design could not accurately modify comparing to the site. So this increases the blindness of design and need modify again and again.PDA, as a new product, developing more than 10 years, has become increasingly maturer, smaller size, higher reliability, lighter weight, less power consumption, larger function, simpler operation, the better visualization of operating system, cheaper and more suitable for carrying. And it's in keep with the use of Windows and it has graphics and real-time display and their power can last a long time, which madea PDA better than portable computer. So the system of road survey and design based on PDA has much more market and will rearly realized one-shot job between survey and design.Therefore, on the base of investigation on surveying and design knowledge of many surveying units and analysis a lot of esisting softwate about surveying and designing. Airmed to control survey, choppy stride survey, road design and adjust, profile and cross section surveyin, 3D survey and investigate of road and so on. The paper studies that surveying and designing system in road engineering based on PDA. Which is good in input and output and management analysis capabilities and which has five modules, data management module, control survey module, design module, 3Dsurveying module and investigate module of road. The system can complete survey and modify program and profile and cross section surveying and various investigates of preliminary design, all the work of road surveying and designing. Almost all can be used to survey. Because of its constituted between blueprint design and spot design, designers can avoid chain breaking precisionly. So it is good to enhance efficiency of surveying and designing and satisy the need of surveying and designing units. What is more, it provides a stability foundation for automation, intelligent, integrated, real-timevisual. |
