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Proceedings Paper

Characteristics of AVIRIS bands measurements in agricultural crops at Blythe area, California: III. Studies on Teff grass
Author(s): Safwat H. Shakir Hanna; Michael D. Rethwisch
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Paper Abstract

AVIRIS data from Blythe were acquired in June 1997 to study the agricultural spectra from different crops and for identification of crops in other areas with similar environmental factors and similar spectral properties. In this respect; the main objectives of this study are: 1) to compare the spectral and radiometric characteristics of AVIRIS data from agriculture crops with the spectra measured by FieldSpec ASD radiometer; 2) to explore the use of AVIRIS images in identifying agricultural crops; 3) to study the impact of environmental factors on selected crops and; 4) to build a spectral library for the crops that were studied. A long-term goal is to extend the spectral library for different vegetation or crops in different stages of growth. In order to support our study, on July 18-19, 2000 we collected spectra using the FieldSpec spectrometer from selected fields planted with different crops at Blythe area, California (at the Longitude 114° 33.28 W and Latitude 33° 25.42 N to Longitude of 114° 44.53 W and 33° 39.77 N Latitude. The teff grass spectra were studied. Teff grass fields were treated with different types of irrigation (i.e. wet to dry conditions). Additional parameters were studied such as the soil water content (WC), pH, organic matter (OM) and nitrogen (N%). The results of this study showed that there is a significant correlation between the data that were collected by AVIRIS image scene in 1997 and spectral data collected by the FieldSpec spectrometer. This correlation allowed us to build a spectral library to be used in ENVI-IDL software. This leads to identification of different crops and in particular the visible part of the spectra. AVIRIS data are in agreement with FieldSpec data. Using IDL algorithms of Spectral Angle Mapper classification (SAM), Spectral Feature Fitting (SFF) and Spectral Binary Encoding (SPE) showed that there is an excellent agreement between the predicted and the actual crop type (i.e. the correlation is between 85 - 90% match). Further use of the AVIRIS images can be of a value to crops identification or crops yield for commercial use. The yield data of Teff grass were correlated significantly with the spectral data from the AVIRIS and from the hand-held radiometer and it showed the impact of irrigation on the yield of the crop.

Paper Details

Date Published: 17 March 2003
PDF: 17 pages
Proc. SPIE 4879, Remote Sensing for Agriculture, Ecosystems, and Hydrology IV, (17 March 2003); doi: 10.1117/12.462487
Show Author Affiliations
Safwat H. Shakir Hanna, Prairie View A&M Univ. (United States)
Michael D. Rethwisch, Univ. of California/Riverside (United States)

Published in SPIE Proceedings Vol. 4879:
Remote Sensing for Agriculture, Ecosystems, and Hydrology IV
Manfred Owe; Guido D'Urso; Leonidas Toulios, Editor(s)

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