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Agrociencia
versão On-line ISSN 2521-9766versão impressa ISSN 1405-3195
Agrociencia vol.40 no.1 Texcoco Jan./Fev. 2006
Crop Science
Determination of growth stage in crops using the Hough transform of canopy reflectance
1Hidrociencias. Campus Montecillo. Colegio de Postgraduados. 56230. Montecillo, Estado de México. México. (pellat@colpos.mx) (mejiasae@colpos.mx)
Canopy reflectance patterns in a soil crop vegetation system are studied using different transformations of red and near infrared spectral bands, first to a parametric space, which is transformed into a meta-parametric space. The latter space completely characterizes the LAI (iso-LAI) curves and defines the crop growth stage. This can be used algorithmically to estimate the LAI for a growing crop. The proposed methodology is validated by simulations generated with the SAIL model for radiation transfer in the canopy.
Key words: Red and near infrared bands; LAI estimation; spectral patterns; Hough transform
Se analizan los patrones de reflectividad del follaje de un sistema suelo-vegetación, utilizando diferentes transformaciones de las bandas espectrales del rojo e infrarrojo espectral, primero a uno paramétrico, el cual después es transformado a uno meta-paramétrico. Este último espacio caracteriza en forma total las curvas iso-IAF del follaje de un cultivo en crecimiento. La metodología propuesta se valida usando simulaciones generadas con el modelo SAIL de transferencia de radiación en el follaje.
Palabras clave: Bandas del rojo e infrarrojo cercano; estimación del IAF; patrones espectrales; transformada de Hough
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Received: May 2004; Accepted: August 2005