1.广西壮族自治区地质环境监测站,广西 南宁,530000
2.成都理工大学地质灾害防治与地质环境保护全国重点实验室,四川 成都,610059
吴福,正高级工程师,主要从事地质灾害监测预警、地质灾害防治工作。404630357@qq.com
廖泽源,硕士。liaozeyuana@163.com
收稿:2024-10-10,
纸质出版:2026-04-05
移动端阅览
吴福,廖泽源,何娜,等.面向茂密植被山区地质灾害调查的LiDAR点云密度优化[J].武汉大学学报(信息科学版),2026,51(4):751-761.
WU Fu,LIAO Zeyuan,HE Na,et al.LiDAR Point-Cloud Density Optimization for Geohazard Surveys in Densely Vegetated Mountainous Areas[J].Geomatics and Information Science of Wuhan University,2026,51(4):751-761.
吴福,廖泽源,何娜,等.面向茂密植被山区地质灾害调查的LiDAR点云密度优化[J].武汉大学学报(信息科学版),2026,51(4):751-761. DOI:10.13203/j.whugis20230386
WU Fu,LIAO Zeyuan,HE Na,et al.LiDAR Point-Cloud Density Optimization for Geohazard Surveys in Densely Vegetated Mountainous Areas[J].Geomatics and Information Science of Wuhan University,2026,51(4):751-761. DOI:10.13203/j.whugis20230386
无人机机载激光雷达(laser detecting and ranging,LiDAR)技术因受环境影响较小、调查视场角独特、能“穿透”植被等优点,已成为植被茂密山区地质灾害调查的新型有效技术手段。但现有规范中针对地质灾害识别的点云密度采集标准尚未完善,现行作业多参照测绘规范确定点云密度,难以满足地质灾害早期识别对陡坎、冲沟等微地貌的精细化表征需求。针对中国广西地区地质灾害规模较小、植被覆盖茂密的特点,选取 4 种较大比例尺,探究不同点云密度对数字高程模型(digital elevation model
DEM)质量的影响规律,引入局部地形复杂度作为定量评价指标,推导最佳地面点云密度,并结合不同植被郁闭度下的激光穿透率,反算得到适配的采集点云密度推荐值。结果表明,局部地形复杂度可有效表征 DEM 的微地貌保留完整度,通过多组点云密度对比实验确定了最优地面与采集点云密度,建立了适用于广西茂密植被山区机载 LiDAR 地质灾害调查的点云密度参考标准。
Objectives
2
Unmanned aerial vehicle
(
UAV)-borne laser detecting and ranging (LiDAR)
which is relatively insensitive to environmental conditions and offers a distinctive viewing geometry with the capability to penetrate vegetation
has become an effective tool for geohazard investigations in densely vegetated mountainous regions. However
point-density requirements tailors to geohazard identification remain underdeveloped. Current practice largely follows general surveying specifications
which often fail to support the fine-scale depiction of micro-topographic features (e.g.
scarps and gullies) needed for early-stage detection.
Methods
2
Focusing on Guangxi
China
where geohazards are typically small in scale and vegetation cover is dense
we examined the effects of varying point-cloud densities on DEM (digital elevation model) quality using four relatively large map scales. Local terrain complexity was introduced as a quantitative indicator to derive the optimal ground-point density. LiDAR penetration rates under different canopy-closure conditions were further incorporated to back-calculate recommended acquisition point densities.
Results
2
Local terrain complexity effectively reflected the completeness of micro-topographic preservation in DEM. Multi-group comparisons across point-cloud densities determined the optimal ground-point density and the corresponding acquisition point density
and produced canopy-closure–adaptive recommended acquisition densities.
Conclusions
2
We establishe a point-density reference standard for unmanned aerial vehicle-borne LiDAR–based geohazard surveys in densely vegetated mountainous areas of Guangxi
enabling more reliable DEM representation of micro-topography to support early geohazard identification.
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