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地基激光雷達提取單木冠層結(jié)構(gòu)因子研究
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中央高?;究蒲袠I(yè)務(wù)費專項資金項目(2015ZCQ-LX-01)和國家自然科學(xué)基金項目(41401650)


Extracting Crown Structure Parameters of Individual Tree by Using Ground-based Laser Scanner
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    摘要:

    在傳統(tǒng)森林計測中,,由于樹木冠層的形態(tài)各異,、結(jié)構(gòu)復(fù)雜,,往往難以精確獲取結(jié)構(gòu)因子,。本文以地基激光雷達為工具,通過對單木掃描獲取點云數(shù)據(jù),,基于球極平面投影和Lambert方位角等面積投影法計算冠層孔隙度,,運用不規(guī)則面投影法和體元法提取樹冠的體積和表面積,并對結(jié)果進行了對比分析,。選取北京林業(yè)大學(xué)校園內(nèi)6株立木為研究對象,,結(jié)果表明,對于冠層孔隙度,,球極平面投影的結(jié)果均小于Lambert方位角等面積投影,,平均誤差為0.03;對于體積和表面積,,運用不規(guī)則面投影法和體元法得到樹冠體積相對誤差為5.32%~12.43%,,平均相對誤差為9.29%,提取的樹冠表面積的相對誤差為1.40%~5.21%,,平均相對誤差為3.33%,。2種方法得到的結(jié)果差別不是很顯著。因此利用地基激光雷達獲取點云數(shù)據(jù),,通過對單木一次掃描提取冠層孔隙度,、樹冠體積和表面積,為計算樹木的三維綠量,、生物量,、光合作用能力等提供了更可靠的數(shù)據(jù)支持。

    Abstract:

    In traditional forest resources survey, it was hard to get tree structure parameters due to its different shapes and complex structures. Totally six stand trees were selected as a sample data in the campus of Beijing Forestry University. By using ground-based laser scanner as a tool to acquire single tree scanning point cloud data, the canopy gap fraction was calculated based on Lambert azimuthal equal area projection and stereographic projection;tree crown volume and surface area were extracted by two methods: irregular surface projection and voxel method by using cloud point data. The results showed that the average relative error of two methods for gap fraction was 0.03, and the extraction result using stereographic projection was smaller than that using Lambert azimuthal equal area projection;the relative error of crown volume of two kinds of extraction methods was 5.32%~12.43%, the average relative error was 9.29%, the relative error of the extracted crown surface area was 1.40%~5.21%, the average relative error was 3.33%. The difference between the results of the two methods were not very significant, therefore, the extraction of gap fraction, crown volume and surface area based on the use of the point cloud data can provide a more reliable data support for 3D green quantity, calculation of trees biomass, photosynthetic ability etc.

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王佳,張芳菲,高赫,呂春東.地基激光雷達提取單木冠層結(jié)構(gòu)因子研究[J].農(nóng)業(yè)機械學(xué)報,2018,49(2):199-206. WANG Jia, ZHANG Fangfei, GAO He, Lü Chundong. Extracting Crown Structure Parameters of Individual Tree by Using Ground-based Laser Scanner[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(2):199-206.

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  • 收稿日期:2017-08-25
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  • 在線發(fā)布日期: 2018-02-10
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