由于经济的飞速发展,许多耕地被占用变为非农业用地。土地管理部门需要及时准确地掌握城镇和农村用地的变化格局,为耕地保护政策的制定提供依据。但传统的土地变更测量方法存在难于准确获取变化边界坐标,成图困难且周期长、人为操作随意性大等不足。在分析各种GPS差分技术的基础上提出了运用移动差分GPS技术获取土地利用变化信息的新方法。作为国家“九·五”攻关项目的研究内容,该方法在包头市郊区县进行了实验,结果证明与传统测量方法相比,具有快速、准确,操作简便,GPS数据输入GIS,可以快速成图等优点。

Due to the rapid development of economy, a great deal of cultivated land was transformed into residence, roads and industry area. In order to support policy-making for cultivated land protection, it is necessary for land administration to understand the quality and quantity of land change. However, the traditional way to update the land data is outdated and difficult to accurately acquire the spatial location of the changed boundary and map the change. Surveyors' carelessness often affects the accuracy. Based on the analysis of various GPS differential methods, this paper proposes a new method to use mobile differential GPS technology to update the land use data. The method is implemented in Baotou City to update the land use data of 1992. The result shows that it has the advantages of high accuracy, efficiency and easiness to manipulate. The GPS data can be easily transferred to GIS system to establish cadastral management information system and output paper maps.