Evaluation of LiDAR Point Clouds Density in the Interpolation of Digital Terrain Models for Power Line Planning in Northeast Brazil

Q4 Social Sciences
J. Centeno, Claudionor Ribeiro da Silva
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引用次数: 1

Abstract

Mapping activities for the implementation of basic and executive projects for electric power transmission lines systematically involves topographic surveys. This study presents the results of a comparative study on the influence of the density of aerial survey points, LiDAR (Light Detection and Ranging), for the calculation of digital terrain models (DTMs) in typical areas of the northeastern region of Brazil, in the context of modeling ground for planning electricity transmission lines. The study area is the region covered by the 230 kV Ibicoara/Brumado transmission line, located in the state of Bahia/Brazil.. In part of this region, elevations of the mountains of the Western Edge of Chapada Diamantina predominate. Therefore, points with varying densities were used to interpolate DTMs in different environments. Point cloud classification (Airborne LiDAR) was performed using the TerraScan program using semi-automatic classification methods, followed by manual refinements. To evaluate the terrain models obtained with different point densities, four areas were selected under transmission line: Area 1 (24.4/m2), Area 2 (46.0/m2), Area 3 (33.7/m2) e Area 4 (29.7/m2). The Airborne LiDAR survey was performed with an Optech ALTM Pegasus HD500 sensor, calibrated to obtain a density of 15 points/m2. The results showed that, depending on the nature of the vegetation cover, less dense laser surveys do not offer enough quality to generate DTMs. However, in some cases, when the vegetation is denser and the terrain is not flat, the quality of the DTM decreases as the density of the points decreases. The study shows that the survey density must be suitable for the region to be analyzed. An important guideline would be to repeat this study in other areas with different coverage and relief variations, in order to create specifications to serve as a basis for planning LiDAR surveys on other transmission lines.
巴西东北部输电线路规划数字地形模型插值中激光雷达点云密度的评估
为执行输电线路基本项目和执行项目而进行的测绘活动系统地涉及地形测量。本研究介绍了在规划输电线路的地面建模背景下,航空测量点密度LiDAR(光探测和测距)对巴西东北部典型地区数字地形模型(DTM)计算的影响的比较研究结果。研究区域为230 kV Ibicoara/Brumado输电线路覆盖的区域,位于巴西巴伊亚州。。在该地区的一部分,查帕达-迪亚曼蒂纳西部边缘的山脉海拔占主导地位。因此,使用不同密度的点来插值不同环境中的DTM。点云分类(机载激光雷达)使用TerraScan程序进行,使用半自动分类方法,然后进行手动细化。为了评估不同点密度下获得的地形模型,在传输线下选择了四个区域:区域1(24.4/m2)、区域2(46.0/m2)、面积3(33.7/m2)和区域4(29.7/m2)。机载激光雷达测量使用Optech ALTM飞马座HD500传感器进行,校准后获得15点/m2的密度。结果表明,根据植被覆盖的性质,密度较小的激光测量无法提供足够的质量来生成DTM。然而,在某些情况下,当植被密度较大且地形不平坦时,DTM的质量会随着点密度的降低而降低。研究表明,调查密度必须适合待分析的区域。一个重要的指导方针是在覆盖范围和起伏变化不同的其他地区重复这项研究,以制定规范,作为规划其他输电线路激光雷达勘测的基础。
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来源期刊
Anuario do Instituto de Geociencias
Anuario do Instituto de Geociencias Social Sciences-Geography, Planning and Development
CiteScore
0.70
自引率
0.00%
发文量
45
审稿时长
28 weeks
期刊介绍: The Anuário do Instituto de Geociências (Anuário IGEO) is an official publication of the Universidade Federal do Rio de Janeiro (UFRJ – CCMN) with the objective to publish original scientific papers of broad interest in the field of Geology, Paleontology, Geography and Meteorology.
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