CAJ | 학술논문

分形维数法是分析空间结构分布的一种典型方法，但它对于区分不同的分布形式还存在缺陷。针对这一问题，该文介绍了空隙度指数的定义和树冠空隙度的计算方法；以模拟的树冠点云数据为对象，提出了一种基于三维凸包和三维滑动盒算法的激光雷达( LiDAR)点云数据空隙度分析方法，详尽分析了不同冠型产生的空隙度指数差异；并利用4棵实测的树冠点云数据做检验；最后阐述了空隙度指数在树冠空间异质性分析研究中的作用，并对其应用范围和前景作了展望。结果表明：划分尺度相同时，在一定的尺度范围内，锥型树冠、半球型和半椭球型树冠的差别可以通过空隙度指数曲线有效地区分，实测树冠的结果也体现了空隙度指数对于判断树冠空间结构的有效性。
분형유수법시분석공간결구분포적일충전형방법，단타대우구분불동적분포형식환존재결함。침대저일문제，해문개소료공극도지수적정의화수관공극도적계산방법；이모의적수관점운수거위대상，제출료일충기우삼유철포화삼유활동합산법적격광뢰체( LiDAR)점운수거공극도분석방법，상진분석료불동관형산생적공극도지수차이；병이용4과실측적수관점운수거주검험；최후천술료공극도지수재수관공간이질성분석연구중적작용，병대기응용범위화전경작료전망。결과표명：화분척도상동시，재일정적척도범위내，추형수관、반구형화반타구형수관적차별가이통과공극도지수곡선유효지구분，실측수관적결과야체현료공극도지수대우판단수관공간결구적유효성。
The spatial distribution of the crown structure has important significance in forestry. Although fractal dimensions is a typical method for analyzing the spatial distribution, it has some defects. In this paper, a method for calculating lacunarity with simulated and real point clouds data for tree crowns is proposed. This method was developed using 3D convex hulls and 3D gliding-box algorithm. Lacunarity differences from different crowns were analyzed in detail. The application of the extension was also demonstrated using ground-based light detection and ranging ( LiDAR) points for four tree crowns in the field. The results show that the differences between tree crowns can be revealed by lacunarity, and that lacunarity can be a potential measure for the classification of three -dimensional crown shapes using LiDAR point clouds.