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《工程勘察》2021,49(11):62-66
机载LiDAR系统可以快速获取数字表面模型,是建立城市三维数字模型的主要途径,准确提取建筑物顶面的点云数据成为问题的关键。本文基于机载LiDAR原始点云数据,提出一种基于区域增长与多次回波分析的建筑物点云提取方法,通过建立网格空间索引,逐行逐列准确地选取地面种子点,基于小坡度区域增长分离出地面点,再对地物点进行基于坡度的区域分割,依据面积阈值滤除小面积的树木区域与其他小面积地物,实现建筑的粗提取,通过统计每个分割区域内的多次回波数量,最终提取出较为准确的建筑物点云数据。实验数据表明,该方法能较好地从LiDAR点云中提取高精度的建筑物信息。 相似文献
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机载LiDAR作为一种高效的空间数据采集方法得到了有效的推广和应用,利用机载LiDAR可以提取多种数据,特别是在提取DEM具有很多优势,其成果数据在城市测绘工作中可以多方面应用,如建筑物高度提取,城市整体的DEM,等高线提取等.本文以常州为例,介绍了机载LiDAR的后处理、DEM提取以及在城市测绘中的应用范例. 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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以沥青混合料图像为评价图像,分别用Roberts算子、Sobel算子、Prewitt算子、Kirsch算子、Laplacian算子、LOG算子和数学形态学边缘检测方法进行边缘检测,对边缘检测结果进行了深入分析,对上述边缘检测算法的边缘定位精度、抗噪声能力和计算时间进行了比较,得出选择数学形态学边缘检测方法作为沥青混合料图像的边缘检测方法是合适的。 相似文献
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从高分辨率遥感影像上进行车辆信息提取可以作为地面车辆分布信息监测的一种全新的方式。文章采用Adaboost算法和多尺度影像分割,结合城市地区地籍资料等现有的资料,分别对大飞机DMC航摄影像和Quickbird-2卫星影像进行了车辆信息提取试验,总结出可以有效地从高分辨率遥感影像上提取车辆对象的方法流程,并对提取正确率等试验结果进行了分析。 相似文献
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为了实现对熔痕金相的有效晶格自动划分与相应的内部特征信息描述,针对金相图像边界模糊、内部晶粒块混乱、晶粒形态分布不规则、切削表面图像噪声大的特点,研究了适合于金相图像分割的图像分割算法和特征提取算法。根据鉴定工作中的实际情况,对熔痕金相进行了基本的直方图处理。在直方图规定化的基础上,对金相进行边缘检测算子的比较和图像形态学重建,设计并改进分水岭算法进行图像分割。为了获得金相图像的方向性梯度特征,采取HOG 算法进行计算。实验结果表明:经过直方图处理,并采取改进后的分水岭算法和HOG 算法,能有效进行晶格区域划分和内部特征信息提取。 相似文献
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Abstract: With the improvements in sensor technologies over the past decade, there has been a significant decrease in the cost of acquisition and increase in the density and accuracy of Light Detection and Ranging (LiDAR) data. Due to its advantages over traditional surveying techniques, LiDAR data are widely preferred for floodplain delineation. But, processing dense LiDAR data is time‐consuming and memory intense. Therefore, it is divided into manageable areas/tiles or simplified to raster DEM (Digital Elevation Model) format for feature extraction process such as floodplain delineation. This results in increase in processing time and decrease in accuracy due to loss of true elevation. Furthermore, as floodplain boundaries are unknown prior to delineation, processing time also increases as LiDAR data over larger extent is processed. Hence, there is a need of improved, automated method that will process only the LiDAR data that contribute to the floodplain. This article, describes a time‐efficient floodplain delineation method that divides the LiDAR data into regular tiles and processes only the tiles that contribute to floodplain. This method is experimented using LiDAR data saved in ArcGIS “Terrain” format at 0.0, 0.1, and 0.3 m pyramid levels. These data are then preprocessed to obtain elevation information which is used to filter and process only LiDAR data tiles that truly contribute to the floodplain boundary; thus, reducing processing time. Results from two pilot hydraulic models showed that this method saved 12–34% of processing time compared to the conventional method. 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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在分析对比经典的边缘提取算法的基础上,利用眼角膜图像的特征改进Canny边缘检测算法进行边缘提取,并对获得的边缘点进行分类识别和拟合,从而实现角膜数据的自动提取。 相似文献