1989 Aquatic Areas - Upper Mississippi River System - Pool 05a

The U.S. Geological Survey's Upper Midwest Environmental Sciences Center (UMESC) has created high-resolution land cover/use data sets for the Upper Mississippi River System (UMRS) from 1:15,000-scale color infrared aerial photos. These data have been used to create a variety of products, one of which is a data set used to classify aquatic areas. The 1989 and 1991 aquatic areas data sets were created by first generalizing the available land cover/use data into a land/water data set, then reinterpreting the aerial photography within the areas classified as water to determine the type of aquatic area. The geographic extent of the UMRS is the Mississippi River floodplain from Cairo, IL to Minneapolis, MN and the Illinois River floodplain from its confluence with the Mississippi near Grafton, IL to Lake Michigan.

美国地质调查局（U.S. Geological Survey）下属中北部环境科学中心（Upper Midwest Environmental Sciences Center，UMESC）依托1:15000比例尺的彩红外航空影像，构建了密西西比河上游流域系统（Upper Mississippi River System，UMRS）的高分辨率土地覆盖/利用数据集。该数据集已被用于开发多款衍生产品，其中一款专用于水生区域分类的数据集即为此类产物。1989年与1991年的水生区域数据集构建流程如下：首先将现有土地覆盖/利用数据概括为陆地/水域数据集，随后对被归类为水域的区域内的航空影像进行重新解译，以此明确水生区域的具体类型。密西西比河上游流域系统的地理覆盖范围为：从伊利诺伊州开罗市至明尼苏达州明尼阿波利斯市的密西西比河河漫滩，以及从其与伊利诺伊州格拉夫顿附近密西西比河的汇流处延伸至密歇根湖的伊利诺伊河河漫滩。