NDLI: A general angle conversion strategy of the measurement on the sloping ground

Content Provider	IEEE Xplore Digital Library
Author	Biao Cao Qinhuo Liu Yongming Du Hua Li Li Li
Copyright Year	2013
Description	Author affiliation: State Key Lab. of Remote Sensing Sci., Beijing Normal Univ., Beijing, China (Biao Cao; Qinhuo Liu; Yongming Du; Hua Li; Li Li)
Abstract	Leaf area index is usually estimated by gap fraction measurement. The mean projection of the unit leaf area on a plane normal to view direction is dependent with the view zenith angle except the view zenith angle is equal to 57.5°. Researchers tried to use this particular angle to overcome the influence of the leaf inclination distribution function. However, the ring of 57.5° is relative to the normal of slope on the slope ground while the measure platform is usually designed based on the flat coordinate. A general angle conversion strategy between slope coordinate and flat coordinate is required by the measurement on the slope. The conversion method was derived in this paper and the 57.5° rings of different slope angles were drawn and compared.
Sponsorship	IEEE Geosci. Remote Sens. Soc.
Starting Page	3801
Ending Page	3804
File Size	442727
Page Count	4
File Format	PDF
ISBN	9781479911141
ISSN	21536996
DOI	10.1109/IGARSS.2013.6723659
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Indexes Azimuth Photography Cameras Estimation Equations Area measurement leaf area index slope angle conversion strategy directional gap fraction
Content Type	Text
Resource Type	Article

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