基于GIS的小流域坡耕地调查方法探讨

Sloping Farmland Investigation Method in Small Watershed Based on GIS

坡耕地研究是水土流失治理及水土保持规划的核心内容 ,GIS的发展及其在多领域的成功应用为坡耕地研究提供了新的技术手段。用矢量基础图件叠加来获取单元图斑的方法是GIS的基本功能 ,但叠加多边形的不确定性成为影响GIS数据质量的灾难性因素。以MapGIS作为基础平台 ,以DOM作为控制底图更新信息 ,采取矢栅叠加的方法获得单元图斑 ,用操作属性表获取专题属性 ,进行小流域坡耕地快速调查的研究 ,展示了矢栅叠加方法在信息复合过程中的显著优势。

The research of sloping farmland is the key part of soil and water loss harness as well as soil and water conservation planning, the development and the application of GIS offered a new technical means for the research of sloping farmland. It is the basic function for GIS to get unit polygon by overlaying the vector map, but the uncertainty of polygon is the disastrous factor affecting GIS's data quality. Based on MapGIS, updated information by DOM. The method of Overlaying Vector and Grid and operating attribute table is used to prosecute the sloping farmland investigation quickly in small watershed. It is the prominent of Overlaying Vector and Grid in the process of information combination.