fAPAR estimates over the Iberian Peninsula by the inversion of the 4SAIL 2 radiative transfer model

  1. Martínez, B. 1
  2. Albargues, E. 2
  3. Camacho, F. 2
  4. Moreno, A. 1
  5. Gilabert, M A. 1
  1. 1 Dpt. Física de la Terra i Termodinàmica, Universitat de València
  2. 2 EOLAB
Revista:
Revista de teledetección: Revista de la Asociación Española de Teledetección

ISSN: 1133-0953

Año de publicación: 2014

Número: 42

Páginas: 61-78

Tipo: Artículo

DOI: 10.4995/RAET.2014.3177 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Revista de teledetección: Revista de la Asociación Española de Teledetección

Resumen

El objetivo de este trabajo consiste en la estimación de la fAPAR en la Península Ibérica a partir de datos MODIS. En primer lugar, se ha simulado un conjunto de datos de reflectividades y de fAPAR a partir de los modelos de transferencia radiativa de hoja (PROSPECT) y de cubiertas heterogéneas (4SAIL2). En segundo lugar, se ha entrenado un conjunto de redes neuronales artificiales (RNAs) para obtener mediante inversión la relación entre la fAPAR y las reflectividades simuladas y así calcular, por último, la fAPAR de la Península Ibérica a partir de imágenes de reflectividad de MODIS. Además, se ha analizado la influencia de la configuración de observación e iluminación, nadir y oblicua. La fAPAR estimada se ha comparado con otros productos ya validados. Los resultados ponen de manifiesto que la fAPAR estimada a partir de la combinación (PROSPECT+4SAIL2+Nadir) proporciona, en general, diferencias alrededor del umbral requerido por los usuarios (0.1). Esta combinación se plantea como una alternativa para estimar la fAPAR en la Península Ibérica por su capacidad para caracterizar distintos tipos de cubiertas, así como por la alta variabilidad intra-anual observada en algunos casos.

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