期刊
REMOTE SENSING OF ENVIRONMENT
卷 104, 期 1, 页码 62-73出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2006.04.022
关键词
canopy reflectance; geometric-optical; modeling; multi-angle remote sensing; semi-arid environments; dessert grasslands; woody shrub encroachment
This work examines the application of a geometric-optical canopy reflectance model to provide measures of woody shrub abundance in desert grasslands at the landscape scale. The approach is through inversion of the non-linear simple geometric model (SGM) against 631 nm multi-angle reflectance data from the Compact High Resolution Imaging Spectrometer (CHRIS) flown on the European Space Agency's Project for On-Board Autonomy (Proba) satellite. Separation of background and upper canopy contributions was effected by a linear scaling of the parameters of the Walthall bidirectional reflectance distribution function model with the weights of a kernel-driven model. The relationship was calibrated against a small number of sample locations with highly contrasting background/upper canopy configurations, before application over an area of about 25 km(2). The results show that with some assumptions, the multi-angle remote sensing signal from CHRIS/Proba can be explained in terms of a combined soil-understory background response and woody shrub cover and exploited to map this important structural attribute of desert grasslands. (c) 2006 Elsevier Inc. All rights reserved.
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