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Proceedings Paper

Remotely sensed estimates of crop water demand
Author(s): Susan L. Ustin; David Darling; Shawn Kefauver; Jonathan Greenberg; Yen-Ben Cheng; Michael L. Whiting
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Paper Abstract

In water limited environments, the density and water content of plant canopies are highly correlated to available soil moisture. Specific absorption bands for liquid water are identifiable and the variation in their depths can be related to canopy water content using high spectral resolution (hyperspectral) imagery. The spectral absorption feature centered at approximately 980 nm has been widely utilized for estimating equivalent water thickness, a measure of the volume of canopy water if it is equally distributed over the area of the pixel. Although it is affected by canopy structure, it is highly correlated with plant water content, and is independent of reflectance changes due to photosynthetic pigments. This study relates the depth of the 980 nm water band absorption, measured by the continuum removal (CR) technique, to crop water stress, and compares these results to other vegetation and plant stress indicators, NDVI and NDWI.

Paper Details

Date Published: 9 November 2004
PDF: 11 pages
Proc. SPIE 5544, Remote Sensing and Modeling of Ecosystems for Sustainability, (9 November 2004); doi: 10.1117/12.560309
Show Author Affiliations
Susan L. Ustin, Univ. of California/Davis (United States)
David Darling, Univ. of California/Davis (United States)
Shawn Kefauver, Univ. of California/Davis (United States)
Jonathan Greenberg, Univ. of California/Davis (United States)
Yen-Ben Cheng, Univ. of California/Davis (United States)
Michael L. Whiting, Univ. of California/Davis (United States)

Published in SPIE Proceedings Vol. 5544:
Remote Sensing and Modeling of Ecosystems for Sustainability
Wei Gao; David R. Shaw, Editor(s)

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