共查询到19条相似文献,搜索用时 171 毫秒
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机载激光雷达数据中电力线的快速提取 总被引:1,自引:0,他引:1
针对当前机载LiDAR技术在电力巡线应用中对电力线数字模型高精度和快速重建的需求,该文提出一种高效的电力线点云分类方法。首先基于局部范围点的高程统计直方图,实现电力线点的快速粗提取;然后运用随机抽样一致性算法剔除残留的电塔点,结合点云高程统计进一步剔除绝缘子点,实现电力线点的精提取;最后利用同一垂直面内电力线点的高程分布特性,实现单根电力线点的快速提取。基于实际输电线路机载LiDAR数据的实验结果表明,该方法可实现电力线点的快速、高精度提取:粗分类后的电力线点中仅含约10%的非电力线点;精分类后约有2%的电力线点被误分为绝缘子点,最终各条电力线点的提取比率平均为98%以上。 相似文献
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基于LIDAR点云数据的电力线提取和拟合方法研究 总被引:3,自引:0,他引:3
从LIDAR电力线扫描数据的高程分布特点出发,提出了基于点云高程数据平面投影的电力线提取和拟合算法。首先通过高程自动阈值分割初步剔除地面点;其次,通过高程投影和重采样将高程分布转换为高程值影像,在影像空间通过直线检测实现电力线提取和拟合;最后,提出了基于数学形态学的电塔分割和潜在危险地物检测。通过对LIDAR点云数据电力线提取和拟合试验表明,本文算法能较好地实现电力线拟合、电塔提取及危险地物检测,可用于基于LIDAR的电力巡线。 相似文献
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为探究不同测量方法获取浅沟数据的精度,本文以元谋干热河谷区浅沟为例,采用RTK、三维激光扫描、近景摄影测量等多种测量方法获取浅沟数据,建立DEM并提取浅沟形态参数,对比近景摄影测量以不同方式获取标记坐标后建立DEM的差异,同时以测针板实测浅沟横剖面为参照,对比分析不同测量方法获取浅沟横剖面的精度。结果表明:RTK获取密度较低的点数据,建立的DEM较粗糙,仅体现沟缘大致走向;近景摄影测量+RTK方法测得的DEM高程整体低于近景摄影测量+全站仪所得DEM高程;利用三维激光扫描仪和近景摄影测量+全站仪两种方法获取数据所提取的浅沟形态参数精度较高;对比浅沟横剖面,横剖面近景摄影测量+全站仪测量所得与实测横剖面重合度较高。因此,利用近景摄影测量+全站仪进行浅沟测量,在精度、效率等方面优势较大。 相似文献
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车载LiDAR数据电力线与塔杆提取方法 总被引:1,自引:0,他引:1
为了实现车载LiDAR数据中电力线和塔杆的正确提取,在分析电力线分布特点的基础之上,提出了电力线和塔杆提取的新方法。该方法首先采用高程分布直方图统计方法去除大量的地面点;然后利用kmeans聚类方法,分离得到电力线和塔杆点云,并借助塔杆点云密度特性进行塔杆定位;最后,依据电力线走向及同一电力线上点间高差较小的特点进行单根电力线的提取,并采用多项式模型对分离得到的电力线进行建模。实验结果表明,该方法能够较好地实现复杂地区的电力要素提取。 相似文献
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从摄影测量原理出发,结合电力线测距的特点,分析了电力线的摄影几何,提出了相应的电力线位置确定策略及满足电力线实时测距要求的基于物方匹配的计算方法,并对实时测量的技术难点进行了分析。模拟实验和实际实验验证了此方法的可行性。 相似文献
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为实现电力线走廊更加有效地巡检,本文设计了一套LiDAR点云数据中电力线自动提取与重建的方法。首先,利用改进的渐进形态学滤波剔除地面点,通过高差阈值与高程离散度分割,实现电力线点粗提取;然后,借助RANSAC直线检测,得到电力线直线模型,依靠密度检测,实现单根电力线点云精确聚类;此外,利用k-means算法完成分裂导线束间归类;最后,进行二次多项式限制的最小二乘拟合,生成电力线曲线模型。试验结果表明,使用该方法电力线点云提取的正确率达98%以上,非电力线点云误判率低至1%左右,电力线直线模型拟合误差在5 cm以下,曲线模型拟合误差在3 cm以下,完全满足实际工程需求。 相似文献
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LIDAR点云数据的建筑物特征线提取 总被引:1,自引:1,他引:0
传统的房屋建模主要采用航空航天立体影像来获取房屋的3维数据,通过在数字摄影测量系统上进行立体量测来实现。这种方式费时、费力、周期比较长,影响了成果的现势性。机载激光雷达可直接、快速获取大面积地表点的三维坐标信息,为建筑物特征线提取和建模带来了便利。以往基于LIDAR点云数据进行建筑物特征线提取,大多只是针对简单的平顶房屋和人字型房屋。本文提出了一种能够精确提取建筑物特征线的方法,通过建筑物区域确定、建筑物顶面分类,能够实现诸如平面、斜面和多层次建筑物特征线提取的方法。 相似文献
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首先阐述了城市3维仿真模型的重要意义,然后分析了3维仿真模型的数据生产方法和建模流程。本文着重对如何运用数字摄影测量工作站采集建筑的特征线,结合Max Script语言快速制作出3维建筑模型的方法进行了初步探索。 相似文献
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Automatic Extraction of Power Lines From Aerial Images 总被引:1,自引:0,他引:1
Guangjian Yan Chaoyang Li Guoqing Zhou Wuming Zhang Xiaowen Li 《Geoscience and Remote Sensing Letters, IEEE》2007,4(3):387-391
There has been little investigation for the automatic extraction of power lines from aerial images due to the low resolution of aerial images in the past decades. With increasing aerial photogrammetric technology and sensor technology, it is possible for photogrammetrists to monitor the status of power lines. This letter analyzes the property of imaged power lines and presents an algorithm to automatically extract the power line from aerial images acquired by an aerial digital camera onboard a helicopter. This algorithm first uses a Radon transform to extract line segments of the power line, then uses the grouping method to link each segment, and finally applies the Kalman filter technology to connect the segments into an entire line. We compared our algorithm with the line mask detector method and the ratio line detector, and evaluated their performances. The experimental results demonstrated that our algorithm can successfully extract the power lines from aerial images regardless of background complexity. This presented method has successfully been applied in China National 863 project for power line surveillance, 3-D reconstruction, and modeling. 相似文献
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G. C. Brock 《The Photogrammetric Record》1973,7(42):687-699
The paper reviews the status of the optical transfer function (OTF) as a potential standard method for measuring the definition of photogrammetric camera lenses. The nature of the OTF and its relation to resolving power are explained. The limited success in obtaining agreement in international comparisons of OTF measurement and the programme of the Scientific Instrument Research Association group research project on the O TFare summarised. Some of the difficulties envisaged in applying the OTF as an ISP standard are discussed. 相似文献
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通过分析倾斜航摄仪的特点,提出一种面向倾斜影像的三维影像分辨率,介绍了3个方向分辨率概念以及推导了斜视影像分辨率的计算公式。结合当前市场上主流的倾斜航摄仪配置,分析了其影像分辨率变化的特点。本文得出的结论对航空摄影设计有重要指导意义,为影像量测精度分析打下了基础。 相似文献
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孙建勇 《测绘与空间地理信息》2012,35(9):191-192
航测影像分辨率高、现势性强,采用航测影像进行送电线路平断面图的绘制是减少外业工作量,提高生产效率的主要手段。本文分析了航测平断面图高程误差产生的原因,提出了利用GPS RTK外业采集高程数据,提高航测平断面图高程拟合精度的方法。 相似文献
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Photogrammetric and laser altimetric reconstruction of water levels for extreme flood event analysis 总被引:1,自引:0,他引:1
Stuart N. Lane Timothy D. James Hamish Pritchard Mark Saunders 《The Photogrammetric Record》2003,18(104):293-307
This paper assesses the feasibility of estimating water levels using digital photogrammetry. A common problem during an extreme flood event is that automated water level recorders do not record the highest water levels, as a result of instrument malfunctioning. This paper explores two possible solutions to this problem based upon data acquired using synoptic remote sensing methods. The first method requires: (a) high-resolution elevation data (for example, in the form of a digital elevation model for the floodplain); and (b) information on the planimetric position of the maximum flood extent, such as from debris lines (known as wrack lines) visible on aerial imagery flown after the event. The planimetric data can then be used to segment the topographic data in order to identify water level elevations. The second method uses a digitial photogrammetric approach and is suitable where no topographic data are available, but aerial imagery is available, flown after the event. Provided this imagery is of the right scale, digital photogrammetric analysis may be used to identify the elevations of wrack lines visible on the imagery. In this paper, the second of these options is compared with the first. The research shows that desktop photogrammetric methods, using 1:4500 scale imagery, can yield water level estimates that are precise to ±0·147 m, on the basis of check data obtained from lidar data. This is a worst possible estimate of the acquired precision given uncertainties in the lidar data. When compared with the first option, based upon segmenting lidar data using flood outlines, the photogrammetric approach was found to be preferable given both the quality of the lidar and uncertainties over how to segment it. 相似文献