Spectral contribution of understory to forest reflectance in a boreal site: an analysis of EO-1 Hyperion data

0451938 - ÚVGZ 2016 RIV US eng J - Článek v odborném periodiku
Rautianien, M. - Lukeš, Petr
Spectral contribution of understory to forest reflectance in a boreal site: an analysis of EO-1 Hyperion data.
Remote Sensing of Environment. Roč. 171, dec (2015), s. 98-104. ISSN 0034-4257. E-ISSN 1879-0704
Grant CEP: GA MŠMT(CZ) LO1415
Institucionální podpora: RVO:67179843
Klíčová slova: forest reflectance model * hyperspectral * boreal * leaf area index * understory
Kód oboru RIV: EH - Ekologie - společenstva
Impakt faktor: 5.881, rok: 2015

Boreal forests exhibit strong seasonal dynamics in their reflectance spectra during the short, snow-free growing period. This short communication paper reports an analysis of the seasonality of boreal forest spectra from the end of snowmelt until the time of maximal leaf area. We apply a forest reflectance model (FRT) to estimate the seasonal contribution of understory vegetation to forest reflectance from a time series of three Earth Observing 1 (EO-1) Hyperion images acquired in May, June and July. The reflectance simulations are based on detailed seasonal series of leaf area index and understory spectra measurements carried out in ten stands at the Hyytiälä Forestry Field Station in Finland. Our results show that the contribution of understory to boreal forest reflectance is high in the visible domain, but it drops at the red edge and stays relatively low and constant in near infrared (NIR). Throughout the growing season, the contribution of the understory remains approximately the same in the NIR domain, whereas larger changes can be observed in the visible domain.
Trvalý link: http://hdl.handle.net/11104/0253062