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Light Reflectance Characteristics and Remote Sensing of Big Bend Loco (Astragalus mollissimus var. earlei) and Wooton Loco (Astragalus wootonii)

Published online by Cambridge University Press:  12 June 2017

James H. Everitt ,
James V. Richerson ,
Mario A. Alaniz ,
David E. Escobar ,
Ricardo Villarreal  and
Michael R. Davis
James H. Everitt
Affiliation:
Remote Sensing Res. Unit, Agric. Res. Serv., U.S. Dep. Agric, 2413 E. Hwy 83, Weslaco, TX 78596
James V. Richerson
Affiliation:
Biol. Dep., Sul Ross State Univ., Alpine, TX 79831
Mario A. Alaniz
Affiliation:
Remote Sensing Res. Unit, Agric. Res. Serv., U.S. Dep. Agric, 2413 E. Hwy 83, Weslaco, TX 78596
David E. Escobar
Affiliation:
Remote Sensing Res. Unit, Agric. Res. Serv., U.S. Dep. Agric, 2413 E. Hwy 83, Weslaco, TX 78596
Ricardo Villarreal
Affiliation:
Remote Sensing Res. Unit, Agric. Res. Serv., U.S. Dep. Agric, 2413 E. Hwy 83, Weslaco, TX 78596
Michael R. Davis
Affiliation:
Remote Sensing Res. Unit, Agric. Res. Serv., U.S. Dep. Agric, 2413 E. Hwy 83, Weslaco, TX 78596
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Abstract

The high near-infrared reflectance (0.76 to 0.90 μm) of Big Bend loco and Wooton loco contributed significantly to their orange-red and red image tonal responses, respectively, on color-infrared aerial photographs making them distinguishable from associated vegetation and soil. Big Bend loco could also be distinguished on color-infrared and near-infrared black-and-white video imagery where it had distinct red and whitish tonal responses, respectively. Computer analyses of photographic and videographic images showed that Big Bend loco and Wooton loco populations could be quantified from other landscape features. A global positioning system was integrated with the video imagery that permitted latitude-longitude coordinates to appear on each image. The latitude-longitude data were integrated with a geographical information system to map Big Bend loco populations.

Keywords

Big Bend loco, Astragalus mollissimus var. earlei (Rydb.) Tidestr., # ASAEAWooton loco, Astragalus wootonii Sheld., # ASAWOColor-infrared photographycolor-infrared video imagerynear-infrared black-and-white video imageryglobal positioning systemgeographical information systemASAEAASAWO
Type
Special Topics
Information
Weed Science , Volume 42 , Issue 1 , March 1994 , pp. 115 - 122
Copyright
Copyright © 1994 by the Weed Science Society of America 

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