基于GIS的江苏省水土保持区划方法

江苏省水土保持区划是为了弥补全国水土保持3级区划在江苏省水土保持上的不足,从而更有效地开展水土保持管理。结合江苏省的特点构建江苏省区划的指标体系,并通过主成分分析方法对指标体系的要素指标进行降维,结合GIS软件绘制江苏省指标体系中自然、社会经济、土地利用和水土流失4个要素分布图,并运用层次分析法得到各个要素的权重,在GIS软件中使用有条件栅格图像叠置法完成4个要素层的叠置,对叠置成果层的栅格图像进行数据的重分类,初步完成了江苏省水土保持的定量区划。该方法可提高水土保持区划的效率和准确性,在一定程度上弥补水土保持区划主观定性的不足。

Regionalization Method of Soil and Water Conservation in Jiangsu Province Based on GIS

The regionalization of soil and water conservation in Jiangsu Province is to make up for the deficiencies of the third level of national regionalization in Jiangsu Province and thus to manage soil and water conservation in the province more efficiently. This paper builds the index system of regionalization in accordance with the characteristics of Jiangsu Province, simplifies the factors' indexes by principal component analysis method, and draws, with the aid of GIS software, the distribution maps of the four major factors, namely nature, economy and society, land use, and soil and water loss. In the maps, the analytic hierarchy process(AHP) is employed to get the weight of each factor, and the conditional raster image overlay method is used to complete the superposition of the four factors with GIS software. The resulted raster images are reclassified and thus the quantitative division of soil and water conservation in Jiangsu Province is finished. This method can improve the efficiency and accuracy of the regionalization of soil and water conservation in Jiangsu Province and make up for the deficiency of subjectivity in the current regionalization.