基于Python的地震时大数据拥堵实时传输系统设计          下载免费PDF全文

王坤  张娅莉 《地震工程学报》2020,42(2):546-551

针对当前地震时数据传输系统存在时延高、安全性较差及数据传输拥堵等问题,提出并设计基于Python的地震时大数据拥堵实时传输系统。系统硬件主要由视频转码模块、Python交互平台、数据流传输模块和系统维护模块几部分组成。利用解协议、解封装、解码、视频数据存储、编码、封装等实现视频转码;利用Python交互平台实现测点与地震数据监测中心之间的交互;结合CDMA传输方式与VPDN组网方式作为无线传输模块;由区域中心运维管理和通知下发等单元组成系统维护模块。系统软件分为收包与发包两种数据传输模式,以收包为主完成系统设计。实验结果表明,该系统响应速度快、延迟低,且安全性较为优越,解决了地震数据拥堵的问题。  相似文献   

一种基于ELK框架的地理信息动态时空数据获取与挖掘方法     

吴嘉琪 《测绘通报》2020,(1):45

尝试将ELK框架在大规模日志实时处理方面的能力抽离出来,将其优势能力与地理信息技术相结合,提供一种基于ELK框架的地理信息动态时空数据获取与挖掘方法。该方法通过建立机制动态采集海量级非结构化数据,并实时筛取与地理要素相关的时空信息,从而实现海量级分析样本下的地理信息时空数据的实时动态分析与挖掘。最后以上海市快速路交通流量作为研究对象验证该方法模型,试验结果能够反映一定的社会潜在规律并提供相关指导价值,证明方法可行,并对方法的优缺点进行了记录与分析。  相似文献   

Impact of vehicles on benthic macrofauna on a subtropical sand beach     

Fabio Cavalca Bom  Leonir André Colling 《Marine Ecology》2020,41(4):e12595

Our study aimed to identify possible relationships between the structure of the benthic macrofauna and the intense use of vehicles in Cassino Beach. Physical changes in the sediment were identified, with high compaction in the sector most affected by the vehicles, especially during the summer. The benthic macrofauna was significantly affected by vehicles, with lower densities observed in the most impacted sector, mainly in the summer, unlike the control sector, where higher densities were observed during the pre-summer and summer. We concluded that the vehicle traffic changes the physical environment of the beach and consequently affects the benthic community in the face of this disturbance. We conclude that the benthic macrofauna is highly impacted by vehicle traffic at Cassino Beach, mainly in the period with the highest traffic, and alternatives are needed for this impact, helping to recover this ecosystem.  相似文献   

基于国际公路运输链的“一带一路”区域公路通达性分析     

李晓丽  吴威  刘玮辰 《地理研究》2020,39(11):2552-2567

国际公路运输作为“一带一路”倡议之互联互通的重要部分,是沿线国家经贸往来的重要载体。本文基于国际公路运输链的角度,结合行车时间和通关耗时,从公路通行能力和通行便捷性两方面分析“一带一路”区域公路通达性。研究表明：① “一带一路”区域公路通行能力分布状况存在不平衡现象,中东欧、中国、印度形成“三极”,通行能力明显高于其他区域,中亚、西亚、东北亚等地区由于公路覆盖率低、缺少高等级公路成为通行能力薄弱区域。② 受累积空间距离、跨境通关时间、公路网的完善程度以及政治局势等因素影响,“一带一路”区域通行便捷性在空间分布上大致呈现“中东欧-中国”双峰结构;区域之间乃至区域内部国家间通行便捷性差异显著,从高通行便捷性到低通行便捷性,通达时间由公路行车时间主导过渡到通关累积时间主导,国家间的通关障碍在很大程度上降低了“一带一路”区域公路运输整体通达性水平。  相似文献   

基于多层次特征的江苏省陆路交通地理国情监测     

张浩  刘连喜  李真 《测绘与空间地理信息》2019,42(2):110-112

江苏省陆路交通发达但地区差异明显。本文围绕江苏省陆路交通地理国情监测实践,通过分析陆路交通的空间特征、功能特征、社会经济影响效应等特征,构建了基于多层次特征的江苏省陆路交通全景式监测指标体系。依托多源时空信息和互联网大数据,研究了支撑陆路交通各特征指标监测的系列关键技术,形成了江苏省陆路交通地理国情监测技术路线。  相似文献   

网络三维技术下的时空可视化分析     

李力  刘梦茜  谷宇航  郑景飚 《测绘与空间地理信息》2019,42(5):94-97

随着数据获取技术的快速发展,海量时空数据的来源越来越广。然而受限于数据的认知能力,人们无法高效地从海量时空数据中获取有用信息。利用人的视觉带宽,进行数据可视化分析,可以大大增强对数据的认知能力,提高数据分析效率,从而更快地对时空进行感知,制定决策。时空立方体作为一种三维的时空数据可视化方法,可以直观地展示时空数据的动态特质、周期性规律以及分布状况,对于辅助决策具有重要意义。本文利用WebGL技术,实现了Web端时空立方体的快速生成;并基于中国铁路运输开展实验,对全国铁路运输时空数据进行可视化分析,验证了网络时空可视化分析的实用性。  相似文献   

广东省乡村聚落空间分布的影响机制及研究内容框架展望（英文）     

杨忍  徐茜  徐楦钫  陈燕纯 《地理学报(英文版)》2019,(2):213-230

Based on land use classification data of remote sensing images, using kernel density, the minimal cumulative resistance model of road traffic accessibility, and a logistic regression model, the characteristics of the spatial pattern and the main factors influencing it were quantitatively examined in Guangdong Province from 1990 to 2013. The framework of the research concerning rural settlement evolution and its effect mechanisms were also discussed and generalized for the future. The results are as follows:(1) The spatial distribution of rural settlements showed spatial directivity of low altitude, low slope, and adjacent to rivers, as well as to villages and towns; thus a special pattern was formed, which was dense on the plains, sparse in mountainous areas, and included two core high density regions of rural settlements in the Chaoshan plain in the east and the Zhanjiang plain tableland region in the west. The spatial distribution of rural settlements was located along the rivers, valleys, and roads with traffic in the mountainous regions surrounding the Pearl River Delta region.(2) In addition to the spatial orientation of the open road, it was important to show that the accessibility of road traffic to the township has had the greatest influence on the spatial distribution of the rural settlements. The connected transport network between towns and villages is significant for rural transformation as a comprehensive increase in township production and service capacity will be the key to optimizing the town-village system in rural areas.(3) Elevation and slope were two basic but influential factors that have affected the distribution, scale, and form of rural settlements. The attributes of the physical geography are the first elements in optimizing village layout and planning spatial reconstruction.(4) In the current Internet and social media era, the reconstruction of market network system orders connects with the global market network system in rural areas. The rural life service circle will be constructed with the township at its core to explore the theory and practice of spatial reconstruction, including its production, life and ecology, and socio-cultural heritage and protection. It will also allow for exploration of the rural settlements' evolution, rural spatial production, rural social networks, group behavior, social autonomy, and social and cultural fields, which will bethe core focus of China's rural spatial reconstruction research against a background of globalization.  相似文献   

1936年以来南京城市空间扩展特征研究     

郝丽莎  王晓歌  乔文怡  张莉 《地理研究》2019,38(4):911-925

城市交通网络的发展是城市空间扩展的重要表征和驱动力。以1936—2015年间6个代表性年份的城市交通地图为数据源,提取相应年份南京城市轴线图,利用基于空间句法的整合度、城市扩张强度（SS-EII）和智能度指数,分析1936年以来南京城市空间扩展趋势和特征,划分演化阶段,并分析城市加速扩张阶段的空间扩展质量。结果表明：① 南京城市空间扩展大体经历了滞缓（1936—1971年）、复兴（1971—1982年）和加速（1982—2015年）三个阶段,逐渐突破老城区,向西南、东北、南部和西北实现全方位空间扩展,形成多中心空间结构。② 加速阶段空间扩展质量总体较高,交通网络建设逐渐与用地扩张相协调,并开始引导城市空间多中心扩散,但各中心间有机联系不足,导致城市空间整体性和空间效率有所降低。③ 应进一步加强多中心间的交通联系,促进人口、经济有机疏散,并提高城市空间整体性。  相似文献   

城市交通热点区域识别及空间交互分析     

颜亮  柳林  李万武 《北京测绘》2020,(4):467-471

出租车载客数据可以用于研究居民的出行特征,提取城市的交通热点区域,但对城市交通热点区域的交互关系研究相对较少。本文以纽约市的出租车行程记录数据为数据源,利用交通小区划分结合出租车载客数据提取城市交通热点区域,基于复杂网络的方法对不同日期类型和天气情况的城市交通热点区域空间交互网络进行研究并进行社区发现。结果表明,热点区域受城市核心区的影响而聚集在核心区域周围,城市内社区的形成可以克服地形和行政区域等因素的影响。研究结论有望为城市规划、城市交通管理、出租车调度、以及人们的出行等提供信息参考。  相似文献   

从对地观测到对人观测——浅析社会地理计算     

李德仁  呙维  常晓猛  李熙 《地理学报(英文版)》2020,30(2):233-250

It is possible to obtain vast amounts of spatiotemporal data related to human activities to support the study of human behavior and social evolution.In this context,geography,with the human-nature relationship as its core,is undergoing a transition from strictly earth observations to the observation of human activities.Geocomputation for social science is one manifestation thereof.Geocomputation for social science is an interdisciplinary approach combining remote sensing techniques,social science,and big data computation.Driven by the availability of spatially and temporally expansive big data,geocomputation for social science uses spatiotemporal statistical analyses to detect and analyze the interactions between human behavior,the natural environment,and social activities;Remote sensing(RS)observations are used as primary data.Geocomputation for social science can be used to investigate major social issues and to assess the impact of major natural and societal events,and will surely be an area of focused development in geography in the near future.We briefly review the background of geocomputation in the social sciences,discuss its definition and disciplinary characteristics,and highlight the main research foci.Several key technologies and applications are also illustrated with relevant case studies of the Syrian Civil War,typhoon transits,and traffic patterns.  相似文献