NDLI: The spatial scaling effect of discrete canopy effective leaf area index retrieved by remote sensing

Content Provider	IEEE Xplore Digital Library
Author	Fan Wenjie Gai Yingying Xu Xiru Yan Binyan
Copyright Year	2012
Description	Author affiliation: Jackson School of Geosciences, the University of Texas at Austin, US., 78712 (Yan Binyan) \|\| Institute of RS and GIS, Peking University, Beijing, China, 100871 (Fan Wenjie; Gai Yingying; Xu Xiru)
Abstract	Leaf area index (LAI) is a critical biophysical variable that describes canopy geometric structures and growth conditions. The scaling effect of LAI has always been of concern. Considering the effects of the clumping indices on the BRDF models in discrete canopies, an effective LAI is defined. The effective LAI has the same function of describing the leaves thick degree with the traditional LAI. The spatial scaling effect of discrete canopies showed significant differences compared with continuous canopies. Based on the directional second derivative method of effective LAI retrieval, the mechanism for producing the spatial scaling effect for discrete canopy LAI has been discussed and a scaling transformation formula for effective LAI has been suggested in this paper. Theoretical analysis showed that the mean values of effective LAIs retrieved from high resolution pixels were always equal to or larger than the effective LAIs retrieved from the corresponding coarse resolution pixels. Both the conclusions and the scaling transformation formula were validated by the airborne hyperspectral remote sensing images obtained in Huailai County, Zhangjiakou City, Hebei Province, China. The scaling transformation formula agreed well with the effective LAI retrieved from hyperspectral remote sensing images.
Starting Page	1688
Ending Page	1691
File Size	167552
Page Count	4
File Format	PDF
ISBN	9781467311601
ISSN	21536996
e-ISBN	9781467311595
e-ISBN	9781467311588
DOI	10.1109/IGARSS.2012.6351201
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-22
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Remote sensing Indexes Vegetation mapping Spatial resolution Reflectivity Scattering directional second derivative (DSD) method spatial scaling effect discrete canopy the effective LAI
Content Type	Text
Resource Type	Article

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