2000 UMRS Land Cover Land Use--Locckport Pool

The U.S. Geological Survey's Upper Midwest Environmental Sciences Center (UMESC) is in the process of creating high-resolution land cover/use data sets for the Upper Mississippi River System (UMRS) from 1:24,000-scale color infrared aerial photos collected in 2000. The photos are being interpreted using a 1-hectare 10% minimum vegetation cover to delineate land cover/land use, percent vegetation cover, tree height, and hydrology regime. The geographic extent of the UMRS is the Mississippi River from Cairo, IL to Minneapolis, MN and the Illinois River from its confluence with the Mississippi near Grafton, IL to Lake Michigan.

美国地质调查局（U.S. Geological Survey）的中西部上游环境科学中心（Upper Midwest Environmental Sciences Center, UMESC）目前正基于2000年采集的1:24000比例尺彩红外航空影像，为密西西比河上游水系（Upper Mississippi River System, UMRS）构建高分辨率土地覆盖/利用数据集。本次影像解译采用1公顷单元、最低10%植被覆盖度作为划定阈值，用以确定土地覆盖/土地利用类型、植被覆盖百分比、树木高度以及水文情势。密西西比河上游水系的地理范围为：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段，以及从其在伊利诺伊州格拉夫顿附近与密西西比河汇流处至密歇根湖的伊利诺伊河河段。