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Journal of Aquatic Plant Management The Aquatic Plant Management Society
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Volume |
41, 2003 |
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Issue |
2 |
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Page |
93 |
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Title |
Using Spatial Information Technologies to Detect and Map Waterhyacinth and Hydrilla Infestations in the Lower Rio Grande |
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Author(s) |
J. H. Everitt, M. A. Alaniz, and M. R. Davis |
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Keywords |
aerial videography, aerial photography, Eichhornia crassipes, Hydrilla verticillata, global positioning system, geographic information system |
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Abstract |
This paper describes a study conducted in 2002 on the application of aerial photography and videography, global positioning system, and geographic information system technologies for detecting and mapping waterhyacinth [Eichhornia crassipes (Mart.) Solms] and hydrilla [Hydrilla verticillata (L. F.) Royle] infestations in the Rio Grande in extreme southern Texas. Waterhyacinth and hydrilla could be readily distinguished in color-infrared photography, color-infrared videography, and normal color videography. The integration of the global positioning system with the video imagery permitted latitude-longitude coordinates of waterhyacinth and hydrilla infestations to be recorded on each image. The global positioning system coordinates were entered into a geographic information system to map waterhyacinth and hydrilla infestations in the Rio Grande. This survey showed an increase in distribution of these weeds of approximately 115 river-km within two counties, as compared to a 1998 survey. |