Mapping three invasive weeds using airborne hyperspectral imagery |
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| Authors: | Chenghai Yang James H. Everitt |
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| Affiliation: | 1. Zoology and Entomology Department, Rhodes University, Grahamstown, South Africa;2. Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, South Africa;1. Department of Mathematics and Statistics, Federal University of Pelotas, Campus Universitário, 354, 96010-900, Pelotas, RS, Brazil;2. Department of Botany, Federal University of Pelotas, Campus Universitário, 354, 96010-900, Pelotas, RS, Brazil;1. Institute of Plant Biochemistry, Photosynthesis and stress physiology of plants, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany;2. Henkelstrasse 247, D-40599 Düsseldorf, Germany;1. Department of Zoology and Entomology, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa;2. School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Private Bag X3, Wits 2050, Johannesburg, South Africa;1. Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Forest Research and Management Organization, 7 Hitsujigaoka, Sapporo, Hokkaido, 062-8516, Japan;2. Research Faculty of Agriculture, Hokkaido University, Kita ku Kita 9 Nishi 9, Sapporo, Hokkaido, 060-8589, Japan;3. Institue of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Science, Nanjing, 210014, China;4. Lab of Ecology and Environmental Science, Agricultural University of Athens, Iera Odos 75, Athens, 11855, Greece;5. Institute of Sustainable Plant Protection, National Council of Research, Via Madonna del Piano 10, Sesto Fiorentino, Florence, 50019, Italy;6. Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA, USA |
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| Abstract: | Invasive plant species present a serious problem to the natural environment and have adverse ecological and economic impacts on both terrestrial and aquatic ecosystems they invade. This article presents three case studies on the use of hyperspectral remote sensing for mapping invasive plant species in both terrestrial and aquatic environments. Methods and procedures for acquisition, processing and classification of airborne hyperspectral imagery as well as accuracy assessment are presented. Examples are excerpted and adapted from published work to illustrate how airborne hyperspectral imagery has been used to map two terrestrial weeds, Ashe juniper (Juniperus ashei Buchholz) and Broom snakeweed [Gutierrezia sarothrae (Pursh.) Britt. and Rusby], and one aquatic weed, waterhyacinth [Eichhornia crassipes (Mart.) Solms], in Texas. In addition to the standard classification methods used in the previous studies, a spectral unmixing technique, mixture tuned matched filtering (MTMF), was applied to the three study cases and the classification results are reported in this paper. A brief discussion is provided on the considerations of different types of remote sensing imagery for mapping invasive weeds. |
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