共查询到20条相似文献,搜索用时 31 毫秒
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LiDAR点云在景观空间定量研究中具有重要作用,而目前对其运用多局限于景观空间的信息采集,为探讨如何基于LiDAR点云数据展开景观空间的相关形态量化分析,选取了过往研究中多局限于二维图像分析的“绿视率”指标进行具体分析讨论,将其量化分析方法归为空间数据采集、处理、建模、分析4个主要环节。以南京河西某住区绿地为研究案例,选取其中4处具有典型差异的空间节点对基于LiDAR点云数据的“绿视率”分析方法加以运用,发现该方法具有“分析高效性”“数据全面性”“结果准确性”3个方面的突出优势及运用价值,对后续风景园林领域研究与实践的高质量、精细化发展具有积极作用。 相似文献
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基于研究快速获取高精度的新型建模技术的目的,采用最新的机载激光雷达技术,通过对LiDAR点云数据的处理与分类,快速获取了地面建筑物精确的三维坐标;使用Terrosolid软件根据地面点云数据自动建立建筑物模型,并结合3ds Max软件进行个体模型的编辑与优化,后期利用建筑物实地照片进行贴图,最终得到了高精度的三维模型,证明了利用LiDAR技术快速建立高精度城市三维模的可行性. 相似文献
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LiDAR技术已经被广泛地应用于城市三维模型的重建.本文在现有方法的基础上,探讨了一种基于数字图像分析技术提取建筑物边界的方法,该方法首先将LiDAR点云数据量化生成灰度影像,然后利用图像分割、边缘检测等图像分析技术将建筑物信息与地面特征分离开,最终提取建筑物的轮廓线.实验结果表明,这种方法能够比较准确地反映建筑物的边界,效果理想. 相似文献
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竣工测量是城市规划行政主管部门进行规划审批后管理的一项重要程序,为城市的规划和城市管理提供完整、准确的、现实性强的基础资料,为数字城市的建设提供必备数据。本文在传统的竣工测量基础上,提出了基于地面LiDAR的建筑物三维竣工测量新模式,阐述了地面LiDAR的规划建筑物竣工验收测量的作业流程,详细介绍了数据采集和处理中的关键技术,开展了一系列建筑物验收测量工程,取得了很好的效果。 相似文献
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随着空间数据应用领域的不断扩展,空间数据的获取和处理成为研究学者的热点问题。20世纪70年代机载雷达测量技术以一种主动式、快速、精确的新型遥感测量方法应运而生,本文主要研究激光扫描数据后处理技术中的滤波分类方法,并通过Terrasolid软件进行点云数据处理,结合具体实例进行粗差剔除,滤波分类等操作。在此过程中,通过设定不同的滤波分类参数进行精度比较,以实现最好的滤波分类效果。 相似文献
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目前,在向钢筋数控加工设备录入钢筋尺寸时,仍然依赖于钢筋加工工人手工录入信息,这种方式既容易造成信息录入错误,也严重降低了钢筋加工效率。本文提出了一种从IFC文件提取钢筋加工数据,并将其以数字化方式传递给钢筋数控加工设备的方法。该方法从IFC文件中解析并提取钢筋实体信息,将其按BVBS格式进行编码后,再将编码转换为PDF417条码格式提交给钢筋加工工人;在钢筋加工厂,钢筋加工工人采用扫描二维码的方式将钢筋加工信息输入到MEP钢筋数控加工设备。该方法已在德州至上饶国家高速公路合肥至枞阳段项目得到成功应用。应用实践表明,该技术可将IFC格式的钢筋模型转换为数控加工文件,减少了工人读图、录入等中间环节,可以提高钢筋的加工效率和精度。 相似文献
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1969考拉首次提出卫星测高的构想,随后便被广泛的应用于高精度地测定南极冰盖高程变化、质量均衡和全球海平面变化的研究之中。本文采用2003年2月-2008年10月共14期数据专门对极地冰盖高程的周年变化进行研究,基于激光光斑交叉重叠方法数据量少的不足,设计提出沿轨切向长510m,沿轨法向长390m的矩形片段,并将可能影响高程变化的主要因素归结为地表坡度、季节性影响、高程变化,并组成时间序列,进行最小二乘间接平差,与交叉重叠方法估计冰盖高程变化相比,显著地增加了研究区的有效数据量,提高解算成果的精度和增强模型的可靠性。实验证明,该方法对分析南极冰盖高程周年变化是有效的。 相似文献
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Terrestrial laser scanning, also known as Light Detection and Ranging (LiDAR) is an emerging technology that has many proven uses in the geotechnical engineering community including rockmass characterization, discontinuity measurement and landslide monitoring. One of the newer applications of LiDAR scanning is deformation monitoring and change detection. In tunnels, deformation is traditionally measured using a series of five or more control points installed around the diameter of the tunnel with measurements recorded at regular time intervals. LiDAR provides the ability to obtain a more complete characterization of the tunnel surface, allowing for determination of the mechanism and magnitude of tunnel deformation, as the entire surface of the tunnel is being modeled rather than a fixed set of points. This paper discusses terrestrial LiDAR scanning for deformation mapping of a surface and for cross-sectional closure measurements within an active tunnel using an elliptical fit to data for profile analysis. The methods were found to be accurate to within a few millimeters when measuring 58 mm of diametric difference over an 18.3 m diameter circular profile, even when some sections of the data were removed from the analysis. 相似文献
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非接触测量技术是结构测量领域的最新进展之一,这类测量方法无需在被测对象上安装传感器,因而在结构试验以及土木工程现场实测中具有一定的优势。三维激光扫描作为一种非接触测量新技术,可以直接获取目标物表面点密集的三维坐标和灰度值,受测试环境干扰小,因而在土木工程领域的应用日益受到关注。在激光扫描技术的基础上,提出一种同名点的匹配方法,以提高变形场计算的精度。这种方法利用激光扫描的灰度信息,对扫描得到的点云坐标和灰度数据进行像素化处理,然后用相关系数法确定同名点并计算位移场。通过一钢梁试验对该方法进行验证,将结果与导杆位移计以及有限元分析的结果作了比对,结果显示该方法可以提高同名点识别的精度,进而提高结构变形计算的准确性,且可以同时获得构件包括平面内和平面外的变形。 相似文献
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Automated Analysis of Mobile LiDAR Data for Component‐Level Damage Assessment of Building Structures during Large Coastal Storm Events 下载免费PDF全文
Rapid assessment of building damages due to natural disasters is a critical element in disaster management. Although airborne‐based remote sensing techniques have been successfully applied in many postdisaster scenarios, automated building component‐level damage assessment with terrestrial/mobile LiDAR data is still challenging to achieve due to lack of reliable segmentation methods for damaged buildings. In this research, a novel building segmentation and damage detection approach is proposed to realize automated component‐level damage assessment for major building envelop elements including wall, roof, balcony, column, and handrail. The proposed approach first conducts semantic segmentation of building point cloud data using a rule‐based approach. The detected building components are then evaluated to determine if the components are damaged. The authors applied this method on a mobile LiDAR data set collected after Hurricane Sandy. The results demonstrate that the approach is capable of achieving 96% and 86% parsing accuracy for wall façades and roof facets, and obtain 82% and 78% of detection accuracy for damaged walls and roof facets. 相似文献
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《岩石力学与岩土工程学报(英文版)》2020,12(5):1001-1013
Displacement monitoring in open-pit mines is one of the important tasks for safe management of mining processes. Differential interferometric synthetic aperture radar (DInSAR), mounted on an artificial satellite, has the potential to be a cost-effective method for monitoring surface displacements over extensive areas, such as open-pit mines. DInSAR requires the ground surface elevation data in the process of its analysis as a digital elevation model (DEM). However, since the topography of the ground surface in open-pit mines changes largely due to excavations, measurement errors can occur due to insufficient information on the elevation of mining areas. In this paper, effect of different elevation models on the accuracy of the displacement monitoring results by DInSAR is investigated at a limestone quarry. In addition, validity of the DInSAR results using an appropriate DEM is examined by comparing them with the results obtained by global positioning system (GPS) monitoring conducted for three years at the same limestone quarry. It is found that the uncertainty of DEMs induces large errors in the displacement monitoring results if the baseline length of the satellites between the master and the slave data is longer than a few hundred meters. Comparing the monitoring results of DInSAR and GPS, the root mean square error (RMSE) of the discrepancy between the two sets of results is less than 10 mm if an appropriate DEM, considering the excavation processes, is used. It is proven that DInSAR can be applied for monitoring the displacements of mine slopes with centimeter-level accuracy. 相似文献
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全站仪编码法立面测量,是利用全站仪免棱镜测距技术按一定的编码法则,采集建筑立面特征点三维坐标,再由数据处理程序,将采集的三维坐标转换为距离和高程组成的二维坐标,自动直观地显示正射投影的立面展点图,最后经要素绘编、尺寸说明标注和图廓整饰等流程,完成立面测量的全过程。这种立面测量方法具有可不接触、快速、操作简单和展点直观等优点。 相似文献
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