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In this paper, Landsat TM data were used to detect the changes of Phragmites distribution.

Phragmites is an invasive species of particular concern in the wetlands of the North American Great Lakes [1,2].

It is a cosmopolitan species of wetland grass native to every continent except Antarctica [3].

In the combination with training samples of other land cover types, supervised classifications were employed to detect the changes of Phragmites area.

In the experiment, we analyzed the variation of Phragmites area from 2001 to 2010, and the result showed that its distribution areas increased from 5156 acres to 6817 acres during this period, which illustrated that the invasion of Phragmites remains a serious problem for the protection of biodiversity.

The transect planned for some units could not be staked due to the lack of an existing formal agreement between DRIWR and the Nature Conservancy, who own the land.

Thus, 22 transects were staked and data collected for 13 DRIWR units.

Combined with Landsat TM images, DOQQ (Digital Orthophoto Quarter Quads), images of the USGS (United States Geological Survey), and NAIP (National Agriculture Imagery Program) images of the USDA (United States Department of Agriculture), this paper presents an automatic sample recognition algorithm (iterative intersection analysis algorithm; IIAA), to study the invasion and changing dynamics of Phragmites in the Detroit River International Wildlife Refuge (DRIWR).

The study area of the DRIWR is situated within the area bounded by 41°43′–42°16′ N, 83°06′–83°30′ W (Figure 1).

Many of these wetland areas have been invaded by Phragmites over a number of years.

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