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The Calculation of Actual LAI Based on Terrestrial LaserScanning Data and Fish Eye Camera(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2014年04期
Page:
137-
Research Field:
计算机科学
Publishing date:

Info

Title:
The Calculation of Actual LAI Based on Terrestrial LaserScanning Data and Fish Eye Camera
Author(s):
Gao Jiqing; Yun Ting; Xue Lianfeng
College of Information Science and Technology,Nanjing Forestry University,Nanjing 210037,China
Keywords:
actual Leaf Area Index; Fish Eye Camera; Stereographic projection; Lambert azimuthally equal-area projection
PACS:
TP301.6
DOI:
-
Abstract:
In order to obtain accurate actual Leaf Area Index(LAIa),this paper presents a calculation method based on Fish Eye Camera and Terrestrial Laser Scanning Data to obtain images of the hemisphere,with the geography latitude line concept to characterize zenith angle of leaves of different heights,and to get leaf angle through statistical methods.Calculating effective Leaf Area Index according to Beer-Lambert Law and actual Leaf Area Index is got through effectively slicing which solves the problem of overlapping leaves.The point cloud data of the tree acquired by Laser Scanning is zoomed on the surface of a sphere by certain scaling.Then,through Stereographic Projection and Lambert Azimuthally Equal-Area Projection,the spherical image is projected onto the plane to get similar hemisphere images.

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Last Update: 2014-12-31