Open-File Report 2010-1327
Invasive plant species disrupt native ecosystems and cause economic harm to public lands. In this report, an example of applying the Detection of Early Season Invasives software to mapping cheatgrass infestations is given. A discussion of each step of the DESI process is given, including selection of Landsat images. Tutorial data, covering a semi-arid area in southern Utah, are distributed with this report. Tips on deriving the inputs required to run DESI are provided. An approach for evaluating and adjusting detection parameters by examining interim products of DESI is discussed.
First posted February 04, 2011
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Kokaly, R.F., 2011, Detecting cheatgrass on the Colorado Plateau using Landsat data: A tutorial for the DESI software: U.S. Geological Survey Open-File Report 2010–1327, 88 p.
Recommended Image Dates for Cheatgrass Detection
Acquisition of Landsat Images
Processing Landsat Data to Map Cheatgrass
Converting Data from Raw Digital Number to Radiance
Converting Data from Radiance to Reflectance
Generating a Mask for Clouds/Snow, Water, Shadows, and Burned Areas
Checking Geographic Agreement Between Early-Season and Midsummer Images
Creating and Evaluating the Cheatgrass Maps