Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 121, Issue 3, Pages 855-863Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JG003322
Keywords
understory; MODIS BRDF; NDVI; multiangle remote sensing
Funding
- Estonian Science Foundation
- UZH Research Priority Program on Global Change and Biodiversity (URPP GCB)
- Transnational Access to Research Infrastructures activity in the 7th Framework Programme of the EC under the ExpeER project
- Academy of Finland
- Grants-in-Aid for Scientific Research [24510014] Funding Source: KAKEN
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Spatial and temporal patterns of forest background (understory) reflectance are crucial for retrieving biophysical parameters of forest canopies (overstory) and subsequently for ecosystem modeling. In this communication, we retrieved seasonal courses of understory normalized difference vegetation index (NDVI) from multiangular Moderate Resolution Imaging Spectroradiometer bidirectional reflectance distribution function (MODIS BRDF)/albedo data. We compared satellite-based seasonal courses of understory NDVI to understory NDVI values measured in different types of forests distributed along a wide latitudinal gradient (65.12 degrees N-31.35 degrees N). Our results indicated that the retrieval method performs well particularly over open forests of different types. We also demonstrated the limitations of the method for closed canopies, where the understory signal retrieval is much attenuated.
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