Study For Measure Of Data Collecting And Data Processing In Road Surveying By Car-borne GPS

The emergence of GPS brings a huge change to the surveying and mapping, it is one of the important markings that the modern surveying and mapping technique develops. After more than ten years of development , the GPS mobile surveying technology is coming into utility step by step . Based on this, the paper researched some critical questions by making use of car-borne GPS surveying the road. The text mainly cosists of the following:①studying the positioning way of dynamic GPS surveying, analyzing respective characteristics, according to present civil condition of technical material, putting forward a positioning method when carrying road surveying. Designing a task pattern of collecting data which carries out the correspondence between the GPS and the computer during the course of data collecting and making the electronic map navigate coming true. Put forward making use of a car to carry the GPS carries on the highway diagraph of the technique route and data handle a method.②Analysing the similarities and differences between the road factor in the common geography information system and as subject element in some certain industry , and designing the data model of road factor , carrying out the method of organizing the road data.③compartmentalizing the whole homework process combining the characteristics that too many information and complexity of preparations, designating the labor in each phase. Putting forward some method to collecting various data , and the confirm method of various road informations.④Aiming to the facts that the low quality data because GPS receiver subjected to the environment condition when collecting data , putting forward the method to repair the navigation data . Analysing the relationshiop between collecting of GPS data and road factor, carrying out a data processing method to get the data of road factor from the GPS data.⑤analysing the organization method of the road census data and data characteristics , putting forward the usage principle of the road census data. studying the source and characteristics of transportation data of the national framework net, putting forward the operation method of the data. Aiming at the data quality problem in the framework net, lodging concrete processing methods.