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231223s2007 xx ||||| 00| ||eng c |
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|a eng
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1 |
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|a Hosoi, Fumiki
|e verfasserin
|4 aut
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|a Factors contributing to accuracy in the estimation of the woody canopy leaf area density profile using 3D portable lidar imaging
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 05.02.2008
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|a Date Revised 05.11.2007
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|a published: Print
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|a Citation Status MEDLINE
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|a Factors that contribute to the accuracy of estimating woody canopy's leaf area density (LAD) using 3D portable lidar imaging were investigated. The 3D point cloud data for a Japanese zelkova canopy [Zelkova serrata (Thunberg) Makino] were collected using a portable scanning lidar from several points established on the ground and at 10 m above the ground. The LAD profiles were computed using voxel-based canopy profiling (VCP). The best LAD results [a root-mean-square error (RMSE) of 0.21 m(2) m(-3)] for the measurement plot (corresponding to an absolute LAI error of 9.5%) were obtained by compositing the ground-level and 10 m measurements. The factors that most strongly affected estimation accuracy included the presence of non-photosynthetic tissues, distribution of leaf inclination angles, number (N) of incident laser beams in each region within the canopy, and G(theta(m)) (the mean projection of a unit leaf area on a plane perpendicular to the direction of the laser beam at the measurement zenith angle of theta(m)). The influences of non-photosynthetic tissues and leaf inclination angle on the estimates amounted to 4.2-32.7% and 7.2-94.2%, respectively. The RMSE of the LAD estimations was expressed using a function of N and G(theta(m))
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|a Journal Article
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|a Omasa, Kenji
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 58(2007), 12 vom: 04., Seite 3463-73
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
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|g volume:58
|g year:2007
|g number:12
|g day:04
|g pages:3463-73
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|d 58
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|e 12
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|h 3463-73
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