基于矢量数据结构的土壤侵蚀强度判别方法研究

Methods Differentiating Soil Erosion Intensity Based on Vector of GIS

讨论了基于 RS和 GIS技术编制区域土壤侵蚀图时 ,进行侵蚀图斑确定、侵蚀因子值提取及利用矢量基本单元综合评价法和矢量因子层面叠加法判别侵蚀强度的方法 ,并举例分析这两种判别方法在侵蚀强度判别上的差异和原因。认为这两种方法均可应用于土壤侵蚀强度判别 ,但因子层面叠加法能更精细地反映土壤侵蚀在微域上的差异。如果有良好的数字化图形时 ,从技术实现和人材物节省上讲 ,采用因子层面叠加法是比较好的选择。

According to the standard of soil erosion classification and grade,th e author discusses the methods of carving up polygons, capturing the values of f actors of impressing soil erosion, and differentiating erosion intensity on the GIS(Geographic Information System). The result and reasons based on the comprehe nsive evaluation on the basic polygon and on the multi-coverage overlay are ana lyzed. The author thinks that two methods can be used for differentiating the er osion intensity, and the latter can reflect the differences of soil erosion amon g small parts. From the technique and save of the manpower,money and material r esources, the multi-coverage overlay is better method when the digital maps of factors exist.