A temperature-controlled spectrometer system for continuous and unattended measurements of canopy spectral radiance and reflectance
| Autor: | Christopher MacLellan, Timo Vesala, Eero Nikinmaa, Janne Levula, Caroline Nichol, T. J. Wade, Guillaume Drolet, Albert Porcar-Castell |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | International Journal of Remote Sensing. 35:1769-1785 |
| ISSN: | 1366-5901 0143-1161 |
| DOI: | 10.1080/01431161.2014.882035 |
| Popis: | 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 Hyytiala 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 implementati... |
| Databáze: | OpenAIRE |
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