排水管线点和道路曲率协同下的道路表面模型获取     

毛涛敏  范业稳  职爽  张煜辉 《测绘通报》2021,(7):144-149

由于数据保密管理及共享机制不完善,城市水务部门用于降雨径流模拟的道路地形数据精度低,模拟精准度不高,进而降低了对城市内涝空间分布准确性的预判和防御。而城市水务部门因业务需要获取的排水管线及管线点数据,不仅反映了排水管线与城市道路的关系,而且管线点数据中的高程信息也反映了道路的起伏态势。据此本文首先基于排水管线点的高程信息,以及协同管线点所在道路的边线曲率所反映的道路横断面特征,通过模型内插获取道路表面特征点;然后根据管线点和内插特征点获取道路表面模型;最后利用武汉市实际道路上的排水管线点和道路边线数据验证该方法的可行性。  相似文献   

一种基于路网等级启发式策略的路径搜索算法   总被引：1，自引：1，他引：0  

高松  陆锋 《地球信息科学学报》2009,11(2):151-156

本文提出了一种基于路网等级启发式策略的路径搜索算法。通过引入考虑路网等级因素的代价评估函数,有目的地引导搜索过程考虑路网道路等级特征,限制路径搜索规模,在精度可控的前提下,大幅度提高时间最短路径算法的效率,并使得搜索路径结果更符合心理认知过程。其与经典的层次空间推理算法相比,本文提出的算法实现过程简单,效率和精度相似。理论分析和实验过程验证了本文所提出算法的有效性。  相似文献   

3D information extraction from laser point clouds covering complex road junctions   总被引：2，自引：0，他引：2  

Sander J.  Oude Elberink  George  Vosselman 《The Photogrammetric Record》2009,24(125):23-36

An automated method for 3D modelling of complex highway interchanges is presented. Laser data and 2D topographic map data have been combined in an innovative 3D reconstruction procedure. Complex situations as shown in this paper demand knowledge to guide the automatic reconstruction. This knowledge has been used in the fusion procedure to constrain the topological and geometrical properties of the reconstructed 3D model. These additions are needed to take care of the lack of data in occluded areas. Laser data has been segmented and filtered before it is fused with map data. In the surface-growing algorithm combining map and laser points, the laser data is assigned to the corresponding road element. Although results are shown using two specific data sources, the algorithm is designed to be capable of dealing with any polygon-based topographic map and any aerial laser scanner data-set.  相似文献   

Internal catchment process simulation in a snow‐dominated basin: performance evaluation with spatiotemporally variable runoff generation and groundwater dynamics     

Piotr K. Kuraś  Younes Alila  Markus Weiler  Dave Spittlehouse  Rita Winkler 《水文研究》2011,25(20):3187-3203

Hydrologic models have increasingly been used in forest hydrology to overcome the limitations of paired watershed experiments, where vegetative recovery and natural variability obscure the inferences and conclusions that can be drawn from such studies. Models are also plagued by uncertainty, however, and parameter equifinality is a common concern. Physically‐based, spatially‐distributed hydrologic models must therefore be tested with high‐quality experimental data describing a multitude of concurrent internal catchment processes under a range of hydrologic regimes. This study takes a novel approach by not only examining the ability of a pre‐calibrated model to realistically simulate watershed outlet flows over a four year period, but a multitude of spatially‐extensive, internal catchment process observations not previously evaluated, including: continuous groundwater dynamics, instantaneous stream and road network flows, and accumulation and melt period spatial snow distributions. Many hydrologic model evaluations are only on the comparison of predicted and observed discharge at a catchment outlet and remain in the ‘infant stage’ in terms of model testing. This study, on the other hand, tests the internal spatial predictions of a distributed model with a range of field observations over a wide range of hydroclimatic conditions. Nash‐Sutcliffe model efficiency was improved over prior evaluations due to continuing efforts in improving the quality of meteorological data collection. Road and stream network flows were generally well simulated for a range of hydrologic conditions, and snowpack spatial distributions were well simulated for one of two years examined. The spatial variability of groundwater dynamics was effectively simulated, except at locations where strong stream–groundwater interactions exist. Model simulations overall were quite successful in realistically simulating the spatiotemporal variability of internal catchment processes in the watershed, but the premature onset of simulated snowmelt for one of the simulation years has prompted further work in model development. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

基于特征基元的高分辨率遥感影像道路网自动提取技术   总被引：1，自引：0，他引：1  

周小成  沈占锋  汪小钦  吴波 《测绘科学》2009,34(3)

高分辨率遥感道路网络的自动提取在城市信息更新等方面具有非常重要的意义。在综述国内外道路信息提取进展的基础上,本文提出一套基于特征基元的道路网提取方法体系。即采取自下而上的研究路线("影像像元—特征基元—道路单元—道路网络"):首先通过影像大尺度的区域划分获取道路区域,在此基础上进行小尺度分割,提取出特征基元;然后根据基元的形态、走向、亮度、纹理等特征对基元进行模式分类,识别出道路单元;最后根据道路网语义规则将道路单元进行形态学处理及拓扑连接,形成道路网络。  相似文献   

光山凉亭金矿地球化学特征及找矿标志     

张传庭 《河南国土资源》1994,(2)

凉亭金矿产于信阳群龟山组上部以绢云石英片岩、碳质绢云石英片岩为主的第四岩性段内，严格受东西向构造破碎带控制。破碎带蚀变强烈、种类繁多，与矿化关系密切的有硅化、绢云母化、褐铁矿化，深部有黄铁矿化等。矿化带原生晕表现为高背景值、强异常的特征。Ａｇ、Ａｓ、Ｐｂ、Ｍｏ、Ｂｉ标型元素与Ａｕ密切相关。本文着重讨论最佳指示元素在不同地层中分布规律、蚀变与矿化富集、原生异常与矿化（体）的关系等，同时建立指示元素的垂直和水平侧向分带序列。  相似文献   

结合规划矢量的高分辨率遥感道路施工进度监测     

贾永红  周伟伟  周明婷 《测绘地理信息》2020,(2):106-110

为了有效监测道路修建项目的工程进度,提出了一种结合规划矢量的高分辨率遥感道路施工进度监测方案。首先,将矢量与高分遥感影像配准,建立道路规划缓冲区;然后,使用双边滤波增强道路信息,基于图割理论从缓冲区中提取出道路区域;最后,使用k-mean++算法得到道路分类图,并和规划矢量叠置分析,获得道路施工进度图。实验结果表明,所提方案充分结合了矢量数据和遥感影像,有效地监测道路项目的施工进度。  相似文献   

山地林道网对林地环境的影响   总被引：6，自引：1，他引：6  

邱荣祖 《山地学报》2001,19(1):38-43

山地林道网对林地环境影响的定量研究是一个重要的却一直未被重视的领域。采用定点观测与面上调查相结合的方法。定量研究山地林道网对林地土壤性质、土壤侵蚀量和植被的影响，分析其成因．揭示山地林道网对林地环境影响的机理。其研究结果可为定量评价森林作业系统对林地环境所产生的负面影响提供依据。  相似文献   

电法勘探在水泥路面勘查中的应用效果   总被引：5，自引：0，他引：5  

汤洪志  刘庆成  易峰 《物探与化探》2001,25(1):75-77

实验测定,混凝土路面实际上是导电的。当需要在水泥路面上进行直流电法勘探时,只要自制特殊电极接地,可像通常一样开展电法勘探工作。  相似文献   

透地雷达检测路面脱空与灌浆加固的应用效果   总被引：4，自引：0，他引：4  

林尤聪  黄伟义  葛如冰  孟凡强 《物探与化探》2001,25(3):231-235

应用透地雷达高精度检测公路混凝土路面脱空发育程度等病害，并采用水泥化学灌浆补强加固，取得了良好的效果。  相似文献