Estimation of seasonal dynamics of understory NDVI in northern forests using MODIS BRDF data: Semi-empirical versus physically-based approach

REMOTE SENSING OF ENVIRONMENT

卷:163

Article

Pisek, Jan¹  Rautiainen, Miina²  Nikopensius, Mans¹  Raabe, Kairi¹ 

[1] Tartu Observ, EE-61602 Toravere, Tartumaa, Estonia

[2] Univ Helsinki, Dept Forest Sci, FIN-00014 Helsinki, Finland

关键词: Boreal;    Forest floor;    NDVI;    MODIS BRDF;    Multi-angle remote sensing;    Radiative transfer model;   

DOI  :  10.1016/j.rse.2015.03.003

来源: Elsevier

【 摘 要 】

The spatial and temporal patterns of the forest background reflectance are critically important for retrieving the biophysical parameters of the forest canopy (overstory) and for ecosystem modeling. In this short communication paper, we retrieved the seasonal courses of understoty Normalized Difference Vegetation Index (NDVI) from MODIS BRDF data using the semi-empirical and physically-based approach. We compared the satellite-based understory NDVI series to seasonal courses of understory NDVI measured in the forests for three full growing seasons in boreal and hemiboreal sites in Northern Europe. Our results indicated both semi-empirical and physically-based approaches using MODIS BRDF data do have a potential to track seasonal changes in understory NDVI. Differences in the performance between of the two retrieval methods can be expected within the boreal zone depending on the level of forest fragmentation. (C) 2015 The Authors. Published by Elsevier Inc.

【 授权许可】

Free