共查询到18条相似文献，搜索用时 140 毫秒
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由于无人机电力影像存在绝缘子器件尺度变化大,输电线路背景复杂,绝缘子缺陷目标小的特点,导致传统目标检测算法识别精度不高。该文提出以YOLOv5l为基础的CA、Transformer编码块和多尺度相融合的改进网络模型,较好的提高了大尺度变化影像上绝缘子缺陷检测的准确性,提升了复杂背景下多类型绝缘子缺陷识别的能力,并解决了微小绝缘子缺陷漏检的问题。基于在某电网公司的数据集上完成训练和验证实验,表明优化模型相比原YOLOv5l模型,准确率提升8.9%,召回率提升4.4%,平均精度均值提升3.5%,说明改进模型对绝缘子缺陷检测有效。 相似文献
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提出一种基于二值化赋范梯度特征和卷积神经网络的航空影像绝缘子自动定位方法。首先利用二值化赋范梯度分类器提取绝缘子候选窗口,而后利用卷积神经网络算法进行精细识别,获得包含绝缘子目标的窗口集,最后对高重叠度窗口集进行加权迭代合并得到最终绝缘子定位结果。采用广东电网大型无人机实际线路巡检获取的可见光影像对自动定位算法进行验证,实验结果表明,在复杂背景下绝缘子整体回调率为90.5%,定位精度为92%,证明该方法能够对复杂背景下可见光影像中的绝缘子进行有效识别定位,且算法通用性较强,可适应不同背景的可见光影像。 相似文献
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Sentinel-1数据自全球免费开放以来已被广泛应用于合成孔径雷达干涉测量及相关应用领域，但是其短波长的特性使其容易在部分低相干区域，特别是在植被覆盖区产生失相干现象，因而目前主流的干涉后失相干评估策略可能会造成Sentinel-1数据的浪费和研究成本的提升。针对此情况，本文在顾及极化方式的前提下，分别建立了光学遥感植被指数NDVI和VV/VH极化下Sentinel-1相干系数的定量模型，并在邻近的验证区对模型精度进行了验证，证明了模型的可靠性。基于建立的模型，可以在Sentinel-1数据干涉前对失相干进行定量评估，以克服上述干涉后评估策略的缺点，提高干涉测量的效率并降低研究成本。 相似文献
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遥感影像数据是国土资源管理的重要基础数据,具有多源、异构、海量、多时相的特点,在数据组织、存储、管理与服务方面具有特定的技术需求。本文针对国土资源遥感影像数据集中管理的情况下,结合数据中心在线、近线和离线的多级存储体系架构,提出了开展多源、异构影像数据分级存储与数据迁移规则的研究,依据影像数据的产品链与生命周期,提出了分级存储的原则、价值评估要素、分级存储的策略与方法,同时提出了基于不同级存储上影像数据之间的迁移规则,对于数据中心开展多源、异构、海量影像数据的高效组织、存储,降低影像数据的运维成本,提升影像数据的应用效率具有指导意义。 相似文献
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随着社会经济的快速发展,城市交通拥堵现象日益严重。为能有效提高城市交通通行效率、降低交通通行成本以及优化交通体系,利用物联网、GIS、大数据以及云计算等先进技术,搭建了城市交通监控管理平台。本文介绍了平台建设背景、软硬件配置环境、框架设计、数据库设计、功能实现以及关键技术。实践证明,利用该平台能够有效地对车速、车流、拥堵情况等进行监控和预警,切实为城市交通的高效运行提供了信息化的手段。 相似文献
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在相对定位基线解算过程中,控制网约束点坐标位置的选取对数据解算精度有一定的影响.讨论了顾及最小几何精度因子(GDOP)值控制网构型选站方法,对全球MGEX(Multi-GNSS Experiment)测站进行6个约束点基准站的选择,利用北斗二号/北斗三号(BDS2/BDS-3)的实测数据,对全球18个连续监测评估系统(iGMAS)观测站的站坐标进行解算,并与全球格网化随机选站法选站结果的解算精度进行对比.实验结果表明:相较于格网化随机选站法,采用顾及GDOP值选站法进行相对定位基线解算时,6000 km以上的基线长度标准差值能够提高约7 mm;长基线在东(E)、北(N)、天顶(U)三方向的标准差值精度提升约5 mm;待定点的点位精度能够提升约40%.可以看出采用GDOP法选站可以提高BDS-2/BDS-3相对定位解算精度. 相似文献
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D.G. Hadjimitsis C.R.I. Clayton A. Retalis 《International Journal of Applied Earth Observation and Geoinformation》2009
Because atmospheric effects can have a significant impact on the data obtained from multi-spectral satellite remote sensing, it is frequently necessary to make corrections before any other image processing can be started. This paper describes a robust and relatively simple atmospheric correction method that uses pseudo-invariant targets (PITs) in conjunction with the empirical line method. The method is based on the selection of a number of suitable generic PITs, on the basis that they are large, distinctive in shape, and occur in many geographical areas. Whereas the multi-temporal normalization method corrects all images to a selected reference image, in this method images are simultaneously corrected using targets with a range of estimated surface reflectance values. The paper describes some applications of the method for a range of environmental studies involving water quality and air pollution monitoring, and mapping land-cover changes. 相似文献
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Participatory modeling is an important approach for solving complex geo-problems from a comprehensive and holistic viewpoint, and it brings together stakeholders from multiple disciplines to provide diverse resources, including modeling, data fields and computational assets. Data configuration work (e.g., preparing appropriate input data for model execution, connecting a model’s output to the input data of another model) is important for constructing and executing a participatory modeling task. Most current data configuration methods depend on the model integration logic, which presents a challenge when adding new modeling resources into a model to dynamically create and execute new modeling tasks. To support the construction of participatory modeling tasks in a web environment, this article proposes a loosely integrated data configuration strategy for decoupling data configuration work from the execution process of a participatory modeling task. A model service controller is designed for model input/output (I/O) configuration, and a data service controller is designed for data access configuration. These two controllers can help modelers link the data I/O demands of a model-service with the appropriate data-services; thus, different modeling instances can be dynamically joined to a participatory modeling task and executed without reconstructing the original data configuration settings. A prototype participatory modeling system is proposed to demonstrate the flexibility and feasibility of the proposed method using an experimental modeling case. The results show that the proposed data configuration strategy supports the integration of different model-services based on the data dependency relationships and that the complexity and difficulty in configuring data for a participatory modeling tasks in the web environment are minimized. 相似文献
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Edzer J Pebesma 《Transactions in GIS》2006,10(4):615-632
Although many geostatistical studies only study a measured attribute in relation to its spatial coordinates, this paper argues that other layers in the GIS database can be of additional use for spatial prediction purposes. They may enter the prediction equations as predictors in a regression model, or as correlated measurements. In an example we will show how this is done for predicting PCB138, a sediment pollution variable, over the North Sea floor. Issues of exploratory data analysis, required sample size, sample configuration, local versus global neighbourhoods, non‐stationarity, non‐linear transformations, change of support and conditional simulation will be discussed in the light of this example. 相似文献
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天基InSAR系统具有全天候、全天时、数据处理自动化程度高等优点,可以快速获取数字表面模型和雷达正射影像,发展前景广阔。本文首先介绍了InSAR测量及影响产品精度误差传递模型,阐述了基于卫星编队InSAR系统;然后,从系统获取干涉数据和确保产品精度两方面出发,提出在不考虑SAR技术的情况下,卫星编队InSAR系统设计主要关键技术有:系统相干性、基线选择、卫星编队设计、双星协同工作、产品精度控制等;最后,在归纳总结天绘二号关键技术攻关的基础上,对这些关键技术所涉及的性能及核心指标进行了分析,提出了设计所关注的要素。 相似文献
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SUI Haigang HUA Li ZHAO Haitao ZHANG Yongli 《地球空间信息科学学报》2005,8(4):262-268
An effective strategy and framework that adequately integrate the automated and manual processes for fast cartographic sounding selection is presented. The important submarine topographic features are extracted for important soundings selection, and an improved “ influence circle” algorithm is introduced for sounding selection. For automatic configuration of soundings distribution pattern, a special algorithm considering multi-factors is employed. A semi-automatic method for solving the ambiguous conflicts is described. On the basis of the algorithms and strategies a system named HGIS for fast cartographic sounding selection is developed and applied in Chinese Marine Safety Administration Bureau （CMSAB）. The application experiments show that the system is effective and reliable. At last some conclusions and the future work are given. 相似文献