Remote sensing of giant salvinia in Texas waterways

Everitt, J.H. and Yang, C. and Helton, R.J. and Hartmann, R.H. and Davis, M.R. (2002) Remote sensing of giant salvinia in Texas waterways. Journal of Aquatic Plant Management, 40, pp. 11-16.

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Official URL: http://www.apms.org/japm/vol40/v40p11.pdf

Abstract

Giant salvinia (Salvinia molesta Mitchell) is an invasive aquatic fern that has been discovered at several locations in southeast Texas. Field reflectance measurements were made on two classes of giant salvinia [green giant salvinia (green foliage) and senesced giant salvinia (mixture of green and brown foliage)] and several associated species. Reflectance measurements showed that green giant salvinia could be best distinguished at the visible green wavelength, whereas senesced giant salvinia could generally be best separated at the near-infrared (NIR) wavelength. Green giant salvinia and senesced giant salvinia could be detected on color-infrared (CIR) aerial photographs where them had pink and grayish-pink or olive-green image responses, respectively. Both classes of giant salvinia could be distinguished in reflectance measurements made on multiple dates and at several locations in southeast Texas. Likewise, they could he detected in CIR photographs obtained on several dates and at widely separated locations. Computer analysis of a CIR photographic transparency showed that green giant salvinia and senesced giant salvinia populations could he quantified. An accuracy assessment performed on the classified image showed an overall accuracy of 87.0%.

Item Type: Article
Title: Remote sensing of giant salvinia in Texas waterways
Personal Creator/Author:
CreatorsEmail
Everitt, J.H.jeveritt@weslaco.ars.usda.gov
Yang, C.
Helton, R.J.tpwdhabitat@inu.net
Hartmann, R.H.
Davis, M.R.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 40
Page Range: pp. 11-16
Date: 2002
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: Light reflectance, color-infrared photography, accuracy assessment, Salvinia molesta
Subjects: Ecology
Management
Biology
Environment
Item ID: 1747
Depositing User: Sciences Librarian Peter Fritzler
Date Deposited: 21 Nov 2008 23:21
Last Modified: 29 Sep 2011 20:10
URI: http://aquaticcommons.org/id/eprint/1747

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