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This article provides an analysis of spectral contribution of understory to forest reflectance in a boreal site using Earth Observing 1 (EO-1) Hyperion data. The authors use a radiative transfer model as a tool to estimate the seasonal contribution of understory vegetation to forest reflectance from a time series of three EO-1 Hyperion images acquired in May, June and July. The 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).

The article is generally reliable and trustworthy as it provides detailed information on its methodology, data sources, field measurements, and results. It also includes references for further reading on related topics. However, there are some potential biases that should be noted. For example, the study only focuses on one particular region – Hyytiälä Forestry Field Station in Finland – which may not be representative for other boreal sites or regions with different climates or species composition. Additionally, while the authors provide detailed information on their methodology and data sources, they do not discuss any potential limitations or errors associated with these methods or sources which could affect their results. Furthermore, while they mention possible differences between needle turnover rates across latitudes, they do not explore this topic further or discuss how this could affect their findings. Finally, while they provide some discussion on potential applications for their findings such as developing high spatial resolution global phenology products for northern forests, they do not explore any other potential applications or implications for their research which could have been beneficial for readers interested in learning more about this topic.