2010/11 Aquatic Areas - Upper Mississippi River System - Alton Pool

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）上中西部环境科学中心（Upper Midwest Environmental Sciences Center, UMESC）已为密西西比河上游流域系统（Upper Mississippi River System, UMRS）构建了高分辨率土地覆盖/利用数据集。2010年8月，该中心使用测绘级Applanix DSS 439数字航空相机，分别以8英寸/像素和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号航段以及伊利诺伊州阿尔顿-马赛利斯航段的彩色红外（color infrared, CIR）航空影像。2011年8月，该中心使用同款相机，以16英寸/像素的分辨率，采集了密西西比河上游14号航段至南部开放河段以及伊利诺伊河德累斯顿-洛克波特航段的彩色红外航空影像。上述彩色红外航空影像通过31类LTRM植被分类法完成解译与自动化处理。该数据集已被用于生成多款衍生产品，其中一款专用于水生区域分类的数据集即源自此批数据。2010/2011年度水生区域数据集的构建流程为：先将现有土地覆盖/利用数据泛化为陆域/水域数据集，随后对被归类为水域的区域进行二次解译，以确定各类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：从伊利诺伊州开罗至明尼苏达州明尼阿波利斯的密西西比河洪泛平原，以及从伊利诺伊州格拉夫顿附近与密西西比河汇流处延伸至密歇根湖的伊利诺伊河洪泛平原。