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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
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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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
HE Qi-Qing

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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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[1] Chen J M, Black T A, Adams R S. Evaluation of hemispherical photography for determining plant area index and geometry of a forest stand[J].Agricultural and Forest Meteorology,1991,56:129-143.
[2] Leblanc S G, Chen J M, Fernandes R, et al. Methodology comparison for canopy structure parameters extraction from digital hemispherical photography in boreal forests[J].Agricultural and Forest Meteorology,2005, 129: 187-207.
[3] Jonckheere I, Fleck S, Nackaerts K, et al.Review of methods for in situ leaf area index determination: Part I. Theories, sensors and hemispherical photography[J].Agricultural and Forest Meteorology, 2004, 121(1/2): 19-35.[4] Ma Zeqing, Liu Qijing, Zeng Huiqing,et al. Estimation of leaf area index of planted forests in subtropical China by photogrammetry[J].Acta Ecologica Sinica,2008,28(5): 1 971-1 980.[马泽清,刘琪璟,曾慧卿,等.南方人工林叶面积指数的摄影测量[J].生态学报,2008,28(5): 1 971-1 980.]
[5] Chen J M, Rich P M, Gower T S,et al. Leaf area index of boreal forests: Theory, techniques and measurements[J].Journal of Geophysical Research,1997,102:29 429-29 444.
[6] Li Xin, Ma Mingguo, Wang Jian,et al. Simultaneous remote sensing and ground-based experiment in the Heihe river basin: Scientific objectives and experiment design[J].Advances in Earth Science, 2008, 23(9):897-914.[李新,马明国,王建,等. 黑河流域遥感—地面观测同步试验:科学目标与试验方案[J]. 地球科学进展, 2008,23(9):897-914.]
[7] Englund S R, O′Brien J J, Clark D B. Evaluation of digital and film hemispherical photography and spherical densitometry for measuring forest light environments[J].Canadian Journal of Forest Research,2000,30(12):1 999-2 005.
[8] Macfarlane C, Coote M, White D A, et al. Photographic exposure affects indirect estimation of leaf area in plantations of Eucalyptus globulus Labill[J].Agricultural and Forest Meteorology,2000,100:155-168.
[9] Zhang Y, Chen J M, Miller John. Determining exposure of digital hemispherical photographs for leaf area index estimation[J].Agricultural and Forest Meteorology,2005,133: 166-181.
[10] Frazer G W, Canham C D, Lertzman K P. Gap Light Analyzer (GLA): Imaging Software to Extract Canopy Structure and Gap Light Transmission Indices from True-colour Fisheye Photographs, Users Manual and Program Documentation[M]. Simon Fraser University, Burnaby, British Columbia, and the Institute of Ecosystem Studies, Millbrook, New York,1999.

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