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Using high spatial resolution satellite imagery to map leafy spurge (euphorbia esula) and Canada thistle (cirsium arvense) in the North unit of Theodore Roosevelt National Park.

The aggressive invasions of both leafy spurge and Canada thistle into Theodore Roosevelt National Park (THRO) have gained much attention because of their ability to severely degrade large areas of land and displace native flora. The North Unit of THRO allows for minimal access, due to rugged terrain, for park managers to map infestations on the ground. Therefore, the use of geospatial technologies such as remote sensing and Geographical Information Systems (GIS) to help locate and map the extent of these plants has been sought after by park managers. IKONOS 4 x 4 m spatial resolution imagery was collected along with Global Positioning System (GPS) points of known infestations. ERDAS image processing software was used to find spectral signatures and results were put into a model, which was used to classify the image for both plant species. Of the North Unit's 9,754 ha land area, 12.8 ha was classified as Canada thistle and 12.7 ha was classified as leafy spurge.

Brent E. Pringle * and Bradley C. Rundquist

Department of Geography, University of North Dakota, Grand Forks, ND 58202
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Title Annotation:Collegiate Communications--Graduate
Author:Pringle, Brent E.; Rundquist, Bradley C.
Publication:Proceedings of the North Dakota Academy of Science
Article Type:Brief article
Geographic Code:1U4ND
Date:Apr 1, 2005
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