2010/11 Aquatic Areas - Upper Mississippi River System - Open River 1

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). Aerial images of Pools 1-13 Upper Mississippi River System and Pools, Alton-Marseilles, Illinois River were collected in color infrared (CIR) in August of 2010 at 8”/pixel and 16”/pixel respectively using a mapping-grade Applanix DSS 439 digital aerial camera. In August 2011, CIR aerial images of Pools 14-Open River South, Upper Mississippi River and Pools Dresden-Lockport, Illinois River were collected at 16”/pixel with the same camera. The CIR aerial images were interpreted and automated using a 31-class LTRM vegetation classification. These data have been used to create a variety of products, one of which is a data set used to classify aquatic areas. The 2010/11 aquatic areas data sets were created by first generalizing the available land cover/use data into a land/water data set, then reinterpreting 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）下属的中西部上游环境科学中心（Upper Midwest Environmental Sciences Center, UMESC）构建了针对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。2010年8月，该中心使用测绘级Applanix DSS 439数码航空相机，分别以8英寸/像素、16英寸/像素的分辨率，采集了密西西比河上游流域系统1-13号河段以及伊利诺伊河Alton-Marseilles河段的彩色红外（color infrared, CIR）航拍影像。2011年8月，使用同款相机以16英寸/像素的分辨率，采集了密西西比河上游流域14号河段至南部开放河段以及伊利诺伊河Dresden-Lockport河段的彩色红外航拍影像。上述彩色红外航拍影像通过31类LTRM植被分类体系完成解译与自动化处理。基于这些数据已生成多款衍生产品，其中一款为用于水域分类的数据集。2010/2011年度水域数据集的生成流程为：首先将现有土地覆盖/利用数据概化为陆/水二元数据集，随后对被归类为水域的区域进行二次解译，以明确具体水域类型。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交汇处延伸至密歇根湖的伊利诺伊河河漫滩。