Establishment Of The Single CORS System And The Application In Rural Land Survey

With the rapid development of the national economy and the urban and rural integration, the problems with rational development and utilization of territorial resources seem especially serious. For further strengthening informatization management of territorial resources, and for comprehensive checking up on national condition of land use, the State Council decided to work on the second land survey project nationwide from July, 2007. This project mainly divides into two parts, urban survey and rural survey. The vast majority of the survey is concentrated on the rural areas, which characterize complex landform and various types of land use, therefore, how to work on the rural land survey correctly and swiftly is extremely essential.The development of GIS, RS and GPS has greatly improved the efficiency and reliability of land survey. At present, rural land survey is to interpret the status quo of the land by means of processing remote sensing image and information extraction, based on the aerospace remote sensing. However, it is quality and resolution of remote sensing image and the professional quality of office operation staff that are the direct cause of leading to incompletely correct interpretation data. Therefore, field work is a key link to guarantee the quality of the survey result. The traditional field survey method is ocular estimate on the map of remote sensing image and interpretation result printed, and to put data into digital form after scanning the survey result, but the accuracy and efficiency of this type of operating model could not satisfy the requirement of the second land survey project. This thesis advances the method of using GPS to receive the DGPS data to achieve real-time high accuracy positioning on the base of the single CORS system. This new field survey model was experimented in Pingshan country, Yibin city, Sichuan province, selected country in this project. The experiment obtains following achievements. (1) The reference station subsystem, data processing center subsystem and data communication subsystem were built according to the overall design requirements of the single CORS system. After system performance test, it shows that the system could entirely achieve the design standard.(2) The remote sensing interpretation images were accomplished by means of information extraction from the 1:10000 scale DOM data, according to the classification criterion of the second land survey. The compressed image and interpretation vector data were imported to GPS to supply the basic data for field survey.(3) The field survey areas around Pingshan country of 4 square kilometers were accomplished by means of using GPS to receive the DGPS data from the single CORS system, according to the rural land survey standard. It proved that this new operating field survey model would change the traditional field survey model, and improve the accuracy and efficiency of field survey.