统筹城乡村镇建设管理平台设计与研究   总被引：1，自引：0，他引：1  

徐占华  吕楠  刘寓 《测绘与空间地理信息》2013,(10):26-28

村镇建设是目前中国城市化中重要研究课题。本文阐述了系统建设背最和目标,并对平台总体设计和工作内容进行描述,在确定目标客户情况下进行数据组织和平台功能需求划分,最终指出系统创新点和为未来平台功能扩充预留接口。  相似文献   

The role of sub‐national government and the private sector in future spatial data infrastructures     

A. Rajabifard  A. Binns  I. Masser  I. Williamson 《International journal of geographical information science》2013,27(7):727-741

A Spatial Data Infrastructure (SDI) facilitates and coordinates the exchange and sharing of spatial data between stakeholders in the spatial data community. With this objective in mind, countries throughout the world are developing SDIs to manage and utilize their spatial data assets more effectively. These countries are developing SDIs to assist in various kinds of decision‐making at different levels of government jurisdictions that have an important impact within their national boundaries. However, current research shows that SDI is understood and described differently by stakeholders from different disciplines and different jurisdictional levels. Therefore, in many cases, SDI initiatives remain very much an innovation, even among practitioners. There are still uncertainties regarding the benefits and identities of SDIs, particularly in connection with how they evolve over time to meet user needs. This paper reviews and assesses the development of SDIs throughout the world over the past 15 years and the leadership role of national governments in SDI creation. This assessment is based on the SDI activities of various jurisdictions including Asia‐Pacific, Australia, North America, and Europe, and research into the worldwide effects of spatial information clearing houses. This assessment includes a discussion on emerging trends in SDI development, with particular reference to the increasingly important role played by sub‐national governments and the private sector within the framework of SDI development. The paper concludes with a discussion of the implications for future SDI development, including the delivery of a virtual world that has a particular focus on facilitating decision‐making at a community level within a national context.  相似文献   

Using adaptively coupled models and high-performance computing for enabling the computability of dust storm forecasting     

Qunying Huang  Karl Benedict  Abdelmounaam Rezgui  Jibo Xie  Jizhe Xia 《International journal of geographical information science》2013,27(4):765-784

Forecasting dust storms for large geographical areas with high resolution poses great challenges for scientific and computational research. Limitations of computing power and the scalability of parallel systems preclude an immediate solution to such challenges. This article reports our research on using adaptively coupled models to resolve the computational challenges and enable the computability of dust storm forecasting by dividing the large geographical domain into multiple subdomains based on spatiotemporal distributions of the dust storm. A dust storm model (Eta-8bin) performs a quick forecasting with low resolution (22 km) to identify potential hotspots with high dust concentration. A finer model, non-hydrostatic mesoscale model (NMM-dust) performs high-resolution (3 km) forecasting over the much smaller hotspots in parallel to reduce computational requirements and computing time. We also adopted spatiotemporal principles among computing resources and subdomains to optimize parallel systems and improve the performance of high-resolution NMM-dust model. This research enabled the computability of high-resolution, large-area dust storm forecasting using the adaptively coupled execution of the two models Eta-8bin and NMM-dust.  相似文献   

台站电源远程管理单元的实现          下载免费PDF全文

王小明  陈婧  张勇 《地震工程学报》2013,35(S1):158-161

由电源测控单元、短信平台及远程控管平台构成的上海市地震局台站电源远程管理单元,实现了对台站市电、UPS、电池组等设备状态的实时监控,对台站电池组的远程充放电功能,以及对台站电源故障的短信告警,为用户提供了可视化的台站电源状态报表,提高了用户对电源故障的处理效率和台站设备运行率。  相似文献   

城市轨道交通保护区综合安全管理研究与应用     

杨晓飞  吴真真  唐超 《测绘通报》2020,(9):7-11

随着城市轨道交通建设规模不断扩大，运营里程逐年累积，轨道交通沿线的工程建设项目存在数量多、工艺复杂、对在建/运营线路安全影响大等问题。本文分析了保护区内影响轨道交通安全的主要因素，针对轨道交通保护区安全管理现状提出综合解决方案，并设计研发出一套针对轨道交通运营安全管理的综合平台，在规范保护区内施工项目管理的基础上，运用物联网、三维激光扫描等先进手段，实现数据的快速采集、处理、分析及预警，保障城市轨道交通的安全运营。  相似文献   

基于跨平台技术的领导用图系统设计     

王垠入  冯德俊  刘立 《测绘与空间地理信息》2020,(1):50-53

传统纸质地图已无法满足政府日常办公和应对突发事件的需求。本文以各级领导指挥决策地图服务需求为导向,采用JavaScript语言,以Cordova为开发平台,以Windows、IOS、Android等多种操作系统的互联网终端设备为载体,将地理信息、多媒体、移动网络等技术充分融合,开发出集成多种功能模块的综合跨平台领导用图系统,使地图服务手段突破时间、空间和载体的束缚,可有效地提高政府日常办公效率,并为其提供可靠的辅助决策依据。  相似文献   

两型半潜式平台波浪作用下载荷敏感性研究     

童波  邹丽  李永刚  张九鸣  赵建  孙铁志 《海洋工程》2020,38(3):31-41

为探究半潜式平台在波浪作用下的载荷敏感特性,根据频域计算得到的水动力衍射/辐射结果,将动水压力作为输入项,利用ANSYS软件进行两型半潜式平台对波浪载荷的敏感性分析。以此对比两型平台响应特性,确定危险工况,并为平台整体结构设计提供参考。其中A型平台为柱稳式半潜平台,B型平台以A型平台为母型进行了水动力性能优化,以适用于北海海域作业环境。研究发现:两型平台的应变均在弹性形变范围内;两型平台会在相似位置处出现较大的等效弹性应力和应变分布,但相比于母型平台A,B型平台在立柱与浮体连接处也存在明显的高应力区;各波浪入射角度下,两型平台的入射波浪最危险周期不同,且存在B型平台响应大于A型平台响应的工况,因此基于水动力性能改进的B型平台,结构上可能存在不足。  相似文献   

Google Earth Engine支持下的江苏省夏收作物遥感提取   总被引：1，自引：0，他引：1  

何昭欣  张淼  吴炳方  邢强 《地球信息科学学报》2019,21(5):752-766

江苏省是农作物种植大省,国家统计局统计数据显示,江苏省近10年冬小麦、冬油菜的总播种面积分列全国第五、第七,快速准确地获取冬小麦和冬油菜的空间分布对于该省的农业发展具有重意义。基于单机的传统遥感分类能够准确获取农作物的空间分布信息,但是耗时较长。随着地理大数据与云平台、云计算的发展,Google Earth Engine（GEE）作为一个基于云平台的全球尺度地理空间分析平台,为快速遥感分类带来了新的机遇。本文基于GEE,使用Sentinel-2数据快速提取了江苏省2017年冬小麦与冬油菜的空间分布。首先,利用GEE获得覆盖江苏省119景无云质优的Sentinel-2影像;其次,在此基础上分别计算了遥感指数、纹理特征、地形特征,并完成原始特征的构建与优化;最后,分别试验了朴素贝叶斯、支持向量机、分类回归树和随机森林4种分类器,比较了各分类器的分类精度,并提取了冬小麦与冬油菜的空间分布信息。得出以下结论：①GEE能够快速完成覆盖江苏省影像数据的去云、镶嵌、裁剪及特征构建等预处理,较本地处理具有明显优势;②J-M距离值位于前两位且大于1将特征数量从28个压缩到11个,有效压缩了原始特征空间;③光谱+纹理+地形特征组合训练,朴素贝叶斯、支持向量机、分类回归树、随机森林的平均验证精度分别为61%、87%、89%、92%。  相似文献   

Seismic Collapse Performance of Jacket Offshore Platforms with Time-Variant Zonal Corrosion Model     

《Applied Ocean Research》2019

Corrosion of offshore platforms is inevitable. In an ocean corrosion environment, the strength of a platform is weakened greatly. When simultaneously subjected to earthquakes or other extreme loads, the ultimate bearing capacity of the corroded platform is dramatically reduced, resulting in compounded damage from both corrosion and earthquake. Thus, the influence of corrosion cannot be neglected in the seismic performance investigation of platforms. The commonly used corrosion model in platform design is uniform corrosion, and the corrosion rate rule for any parts or zones in a platform is the same. In real cases, however, there are significant differences between the corrosion characteristics in different parts of a platform. Based on theoretical aspects and measured data, a zonal time-variant corrosion model of a platform is developed for a seismic collapse performance investigation. The pushover and incremental dynamic analysis (IDA) methods are adopted here to calculate the collapse margin ratio (CMR), there serve strength ratio (RSR) and ductility coefficient (μ) that are frequently used for the safety reserve evaluation of a platform. The failure reason and collapse probability of platforms considering different service periods are compared. The most prominent feature of the proposed time-variant zonal corrosion model is to capture potential switch of weak location and resulting failure path of corroded jacket offshore platforms although the proposed model needs further calibration by more reliable in-field measured data. As expected, corrosion can definitely cause a reduction in earthquake resistance of a jacket offshore platform, as well as ultimate deformability. The coupled effect between the time-variant vibration properties of the platform and the spectral characteristics of selected motions, the collapse-level spectral acceleration (SA) does not always decrease with increasing corrosion degree. The curves corresponding to normalized CMR and RSR agree very well with each other in the early corrosion development stage and service period beyond 30 years. Some distinct differences can be found during the two stages, with the greatest difference up to 10% for the example platform.  相似文献   

Modelling the effects of permafrost loss on discharge from a wetland‐dominated,discontinuous permafrost basin     

Lindsay E. Stone  Xing Fang  Kristine M. Haynes  Manuel Helbig  John W. Pomeroy  Oliver Sonnentag  William L. Quinton 《水文研究》2019,33(20):2607-2626

Permafrost degradation in the peat‐rich southern fringe of the discontinuous permafrost zone is catalysing substantial changes to land cover with expansion of permafrost‐free wetlands (bogs and fens) and shrinkage of forest‐dominated permafrost peat plateaux. Predicting discharge from headwater basins in this region depends upon understanding and numerically representing the interactions between storage and discharge within and between the major land cover types and how these interactions are changing. To better understand the implications of advanced permafrost thaw‐induced land cover change on wetland discharge, with all landscape features capable of contributing to drainage networks, the hydrological behaviour of a channel fen sub‐basin in the headwaters of Scotty Creek, Northwest Territories, Canada, dominated by peat plateau–bog complexes, was modelled using the Cold Regions Hydrological Modelling platform for the period of 2009 to 2015. The model construction was based on field water balance observations, and performance was deemed adequate when evaluated against measured water balance components. A sensitivity analysis was conducted to assess the impact of progressive permafrost loss on discharge from the sub‐basin, in which all units of the sub‐basin have the potential to contribute to the drainage network, by incrementally reducing the ratio of wetland to plateau in the modelled sub‐basin. Simulated reductions in permafrost extent decreased total annual discharge from the channel fen by 2.5% for every 10% decrease in permafrost area due to increased surface storage capacity, reduced run‐off efficiency, and increased landscape evapotranspiration. Runoff ratios for the fen hydrological response unit dropped from 0.54 to 0.48 after the simulated 50% permafrost area loss with a substantial reduction of 0.47 to 0.31 during the snowmelt season. The reduction in peat plateau area resulted in decreased seasonal variability in discharge due to changes in the flow path routing, with amplified low flows associated with small increases in subsurface discharge, and decreased peak discharge with large reductions in surface run‐off.  相似文献