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Combining hyperspectral vegetation indices for a better estimation of crop chlorophyll content for application to precision agriculture

AuthorsHaboudane, D.; Miller, John R.; Tremblay, Nicolas; Zarco-Tejada, Pablo J.
KeywordsCrop chlorophyll content
Hyperspectral vegetation indices
Issue Date2001
AbstractRecent studies have demonstrated the usefulness of optical indices from hyperspectral remote sensing in the assessment of vegetation biophysical variables both in forestry and agriculture. Those indices are, however, responsive to variations of several vegetation and environmental properties such as: Leaf Area Index (LAI), leaf chlorophyll content and background soil reflectance. The chlorophyll content is an indicator of photosynthesis activity, and is linked to the nitrogen concentration in green vegetation. For this reason, remote sensing techniques promise a potentially efficient tool to assess the spatial variability of nitrogen in the agricultural landscapes, and the response to nitrogen application. To this purpose, an accurate and quick estimation of the vegetation chlorophyll content will help in advising farmers about supplying adequate nitrogen quantities and preventing excessive nitrogen losses to the environment. This paper presents a combined modelling and indices-based approach to determine the crop chlorophyll content while minimizing LAI (vegetation parameter) influence and underlying soil (background) effects. This combined method has been developed first using simulated data, and followed by evaluation in terms of quantitative predictive capability using real hyperspectral data. Simulations consist in leaf and canopy reflectance modeling with PROSPECT and SAIL models, which are followed by application to hyperspectral CASI imagery that were collected over corn crops in three experimental farms from Ontario and Quebec, Canada. Results presented are from the L’Acadie, Quebec, Agr. & Agri-food Canada research site.
DescriptionPresented at the International Symposium of Spectral Sensing Research (ISSSR), Quebec City (Canada), June 10th-15th, 2001.
Appears in Collections:(IAS) Comunicaciones congresos
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