gSSURGO-based Floodplain Maps of Illinois

This dataset provides a shapefile showing the natural floodplain for Illinois. These floodplain polygons for the entire state are extracted from the gSSURGO soil data from the Natural Resources Conservation Service (NRCS).本数据集提供了一份展示伊利诺伊州自然洪泛平原的shapefile文件。该州全境的洪泛平原多边形系从自然资源保护服务局（NRCS）的gSSURGO土壤数据中提取而来。