1989 Aquatic Areas - Upper Mississippi River System - Pool 13

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. Area coverage for this data set is the Upper Mississippi River between Minneapolis, MN and Cairo, IL, and the Illinois River from its confluence with the Mississippi to Joliet, IL.美国地质调查局（U.S. Geological Survey）下属的上中西部环境科学中心（Upper Midwest Environmental Sciences Center, UMESC）依托1:15000比例尺的彩红外航空照片（color infrared aerial photos），构建了针对上密西西比河系统（Upper Mississippi River System, UMRS）的高分辨率土地覆盖/利用（land cover/use）数据集。该数据集已被用于衍生多款产品，其中一款为用于水域（aquatic areas）分类的专用数据集。1989年与1991年的水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/水二分数据集，随后对被标记为水域的区域重新解译航空影像，以明确水域的具体类型。本数据集的覆盖范围为明尼苏达州明尼阿波利斯至伊利诺伊州开罗的上密西西比河河段，以及从与密西西比河汇流处至伊利诺伊州乔利埃特的伊利诺伊河河段。