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Advances in Earth Science  2009, Vol. 24 Issue (7): 803-809    DOI: 10.11867/j.issn.1001-8166.2009.07.0803
Articles     
Leaf Area Index Estimation for Qinghai Spruce Forest Using Digital Hemispherical Photography
Ling Feilong1,2,Li Zengyuan1,Chen Erxue1,He Qisheng3
1.Institute of Forest Resources Information Research, Chinese Academy of Forestry, Beijing  100091, China;
2.Spatial Information Research Center, Fuzhou University, Fuzhou  350002, China;
3.Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing  100101, China
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Abstract  

After the fundamental basics of leaf area index measurement by optical instrument and digital hemispherical photography were introduced, the impact of the camera exposures was analyzed for high quality fish-eye photo acquisition. We proposed a new method for camera settings. The optimum exposure would be two stops less exposure than the referenced exposure, which is measured by automatic exposure with the stands. This setting could be achieved by fixing the aperture and tuning the shuttle speed. The three bands of the photo were also compared to select the best one for sky-foliage segmentation. A digital photo processing procedure was proposed including selecting the blue band and using the area covering the 0~60° zenith angles for LAI calculation. Consistence was achieved between our results and those from LAI-2000 thanks to the multi-equipment comparison experiments on LAI measurement of Qinghai spruce.

Key words:  Leaf area index      Hemispherical photography      Fish-eye lens      Exposure      Qinghai spruce     
Received:  28 April 2009      Published:  10 July 2009
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LING Fei-Long
LI Ceng-Yuan
CHEN Er-Hua
HE Qi-Qing

Cite this article: 

Ling Feilong,Li Zengyuan,Chen Erxue,He Qisheng. Leaf Area Index Estimation for Qinghai Spruce Forest Using Digital Hemispherical Photography. Advances in Earth Science, 2009, 24(7): 803-809.

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http://www.adearth.ac.cn/EN/10.11867/j.issn.1001-8166.2009.07.0803     OR     http://www.adearth.ac.cn/EN/Y2009/V24/I7/803

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