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Remote Sensing of Broom Snakeweed (Gutierrezia sarothrae) and Spiny Aster (Aster spinosus)

Published online by Cambridge University Press:  12 June 2017

James H. Everitt
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 267, Weslaco, TX 78596
Russ D. Pettit
Affiliation:
Texas Tech. Univ., Dep. Range and Wildlife Manage., Lubbock, TX 79409
Mario A. Alaniz
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 267, Weslaco, TX 78596

Abstract

Field spectroradiometric plant canopy measurements showed that broom snakeweed [Gutierrezia sarothrae (Pursh.) Britt. and Rusby # GUESA] and spiny aster (Aster spinosus Benth. # ASTSN) had lower near-infrared (0.85-μm) reflectance than did other associated rangeland shrubs and herbaceous vegetation. The low near-infrared reflectances of both species were attributed to their erectophile (erect leaf/stem) canopy structures. These low near-infrared reflectance values caused broom snakeweed to have a dark-brown to black image on color-infrared aerial photos (0.50- to 0.90-μm), whereas spiny aster had a dark reddish-brown to black image. Other rangeland plant species had light-brown, red, or magenta images. Computer-based image analyses of color-infrared film positive transparencies showed that broom snakeweed and spiny aster infestations could be quantitatively differentiated from associated rangeland species. Computer analyses can permit “percent land area infested” estimates of broom snakeweed and spiny aster infestations on rangelands.

Type
Special Topics
Copyright
Copyright © 1987 by the Weed Science Society of America 

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