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A temperature-controlled spectrometer system for continuous and unattended measurements of canopy spectral radiance and reflectance

Summary

Published in International Journal of Remote Sensing 35(5): 1769-1785

This paper describes the development of a fully automated system for collecting high-resolution spectral data over a forested footprint. The system comprises a pair of off-the-shelf spectrometers in a custom-built thermal enclosure with a fixed off-nadir downward (target)-pointing fibre and upward-pointing fibre for irradiance measurement. Both instruments sample simultaneously via custom-written and user-controlled software during all weathers and sky conditions. The system is mounted on a 25 m eddy covariance scaffolding tower, approximately 7 m from a Scots pine forest canopy. The system was installed at the University of Helsinki’s SMEAR-II Field Station in Hyytiälä in March 2010 and has been operating continuously through a joint programme between the Universities of Edinburgh and Helsinki. The system was designed to capture diurnal and seasonal variation in vegetation light-use efficiency and fluorescence through the capture and analysis of well-defined narrow spectral features, but its implementation would permit the extraction of further optical signals linked to vegetation biophysical variables, and provide a continuous data stream with which to validate satellite data products including vegetation indices such as the photochemical reflectance index (PRI) as well as spectral indicators of solar induced fluorescence.

Sector(s): 

Forests

Categorie(s): 

Scientific Article

Theme(s): 

Forest Growth and Yield Modelling, Forestry Research, Forests

Departmental author(s): 

Drolet, Guillaume

Author(s)

DROLET, Guillaume, Tom WADE, Caroline J. NICHOL, Chris MACLELLAN, Janne LEVULA, Albert PORCAR-CASTELL, Eero NIKINMAA and Timo VESALA

Year of publication :

2014

Format :

Paper

Keywords :

spectromètre, mesure spectrale, réflectance, canopées forestières, fluorescence induite par le soleil, photosynthèse, modélisation de la croissance et du rendement des forêts, article scientifique de recherche forestière, radiance, forest growth and yield modelling, spectrometer, spectral measurements, reflectance, forest canopies, sun-induced fluorescence, photosynthesis

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