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Titre :
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Ku- and C-band SAR for discriminating agricultural crop and soil conditions
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Auteurs :
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M. Moran ;
A. Vidal ;
D. Troufleau ;
AL Et
|
|
Type de document :
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article/chapitre/communication
|
|
Année de publication :
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1998
|
|
Format :
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p. 265-272
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Langues:
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= Anglais
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Catégories :
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TELEDETECTION
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Mots-clés:
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VEGETATION
;
TELEDETECTION
;
HUMIDITE DU SOL
;
CARTOGRAPHIE
;
RUGOSITE
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Résumé :
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A method is proposed to estimate both green leaf area index (GLAI) and soil moisture (h(v)), based on radar measurements at the Ku-band (14.85 GHz) and C-band (5.35 GHz) frequencies. The Ku-band backscatter at large incidence angles was found to be independent of soil moisture conditions and could be used alone to estimate GLAI. Then, the Ku-band estimate of GLAI could be used with a measurement of C-band backscatter in a canopy radiative transfer model to isolate the value of h(v). This concept was demonstrated with a set of Ku- and C-band synthetic aperture radar (SAR) backscatter data acquired over agricultural fields in Arizona. The demonstration showed promise for operational application of the method, though several limitations were identified. Since both Ku- and C-band sigma(o) are sensitive to soil roughness, this approach must be applied only to fields of similar soil roughness or row direction.
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Source :
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IEEE transactions on geoscience and remote sensing, vol.36, n°1
|
