NDLI: The effect of small topographic variations on reflectance

Content Provider	IEEE Xplore Digital Library
Author	Combal, B. Isaka, H.
Copyright Year	1980
Abstract	The influence of topography on the bidirectional reflectance factors (BRFs) of vegetation canopies is commonly neglected when retrieving canopy parameters by inversion of reflectance models. However, the nonlinear dependence of vegetation BRFs on slope magnitude and orientation means that topography cannot necessarily be assumed to have an insignificant effect, even when slopes are small. The study presented here shows that, at a Sun zenith angle of 60/spl deg/, the reflectance of a set of terrain elements may differ from that of horizontal terrain by more than 10% at forward scattering directions for slopes of 10/spl deg/ or less. The errors may also be strongly correlated to observation conditions, which raises questions about using least squares minimization schemes to find the best fit between measured and modeled reflectance data.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	663
Ending Page	670
Page Count	8
File Size	416599
File Format	PDF
ISSN	01962892
Volume Number	40
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflectivity Vegetation mapping Surfaces Bidirectional control Scattering Information retrieval Predictive models Sun Least squares methods Artificial satellites
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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