基于GIS的突发事件网络舆情传播可视化探究

我国处于社会转型期，对突发事件引起的网络舆情分析需求迫切。微博由于其大数据特点为公众舆论和自然环境知识发现提供大量数据，将其与位置信息联系能给地理分析提供新的发现。通过用户发布的微博消息进行分析挖掘，为公众舆论监督提供帮助，为政府决策提供信息。本文在微博数据帮助下进行了数据挖掘，在空间维度上分析了舆论传播模式，使用可视化与统计方法相结合的方式探究了舆情传播规律。     

交通流量时空特征可视化分析——以海口市2017年5月至10月滴滴出行数据为例

滴滴出行数据中包含了丰富的用户位置信息、出行时空属性、用户行为规律与特征,通过对这些信息的深入分析与挖掘,并结合可视化技术,以图形图像的方式展示,有助于分析用户出行的规律.为了直观展示海口市交通流量动态变化,分析车辆出行的时空规律和交通出行路况,设计一个可视化分析系统.以日历图、径向柱状图等可视化方法为依据,结合可视化工具,从出行数据的不同维度着手分析海口市交通流量情况.该系统能够客观地反映海口市交通变化情况,可以为交通管理规划提供合理的依据.     

基于改进Markov算法的人类活动信息挖掘

近年来,基于位置的社交媒体飞速发展,为人类移动规律的挖掘与研究带来新的数据源。基于扩展Markov模型,加入时间维度,提出一种利用社交媒体时空数据挖掘人类活动规律的方法,探索用户的活动位置和活动位置的变化规律。应用该方法对北京市新浪微博用户的个体和群体活动规律进行探索,可有效挖掘人类在以小时为单位细粒度时段的移动规律并由此反映区位人口的动态变化。     

基于时空地理格网的空间数据融合方法

针对时空数据海量、多源、异构造成难以融合、难以深度挖掘数据知识等问题,文中提出时空地理网格概念,将空间数据的时间维和空间维度有效地结合起来,构建时空地理网格单元,通过时空地理网格单元为时空数据赋予时空属性,用以解决时空多源数据融合的问题。以基于北京市多源信息的人口分析为例,验证多源时空信息网格的可靠性,并进一步研究北京市人口发展规律,为智慧城市发展提供决策分析。     

北京市数字化地质资料服务模式研究

为了更好地挖掘北京市数字化地质资料信息的潜在价值,分析了地质资料情况、地质资料的作用,从地质资料为找矿突破战略行动提供服务支撑角度出发,建立了地质资料信息产品体系框架,提出了采用主动式或定单式的专题数据加工形式满足专业要求高的离线用户,基于服务等软件技术手段实现跨单位的地质资料集成与应用系统满足不同领域在线用户的信息需求,为大型城市开展有效的分布式地质资料信息服务提供参考。     

基于文本挖掘的个性化地图服务模型研究

随着个性化地图服务的深入研究,如何获取更加实时可靠的用户个性化信息和需求,成为当前研究的难点。本文从人们最重要的交流工具——文本数据出发,在当前文本挖掘技术的支持下,提出了一种能够识别挖掘用户所言,分析提取用户所需,并最终实现地图可视化的个性化地图服务模型。通过实例验证,该模型能够有效地提取地图知识和用户信息,为个性化地图服务的发展提供技术和数据支撑。     

基于元数据的语义识别搜索方法的研究与实现

搜索技术是当前网络领域中最为热门的研究领域,搜索引擎的好坏在很大程度上决定了用户使用网络资源的效率高低。搜索引擎的效率主要是取决于系统对用户输入检索词的解析与识别。因此一个好的搜索引擎需要能够对用户输入的信息进行语义解析,准确有效地对用户意图进行识别、解析与理解,并为用户返回最为合适的搜索结果。本文设计开发了一种基于元数据的网络搜索语义识别算法,并成功应用于中国可持续发展信息共享系统中,建立基于可持续发展元数据的搜索引擎,对用户的不同需求提供不同的元数据搜索方式,最终根据可持续发展共享数据与元数据的映射关系,实现由基于数据分类存储模式的数据共享服务转变为以元数据搜索为驱动的数据共享服务模式,为用户提供了高效的可持续发展元数据搜索引擎,极大提高了中国可持续发展信息共享系统的数据共享服务能力。     

基于Google Map的虚拟旅游信息系统研究

基于WebGIS网络信息开发技术,在.net平台下利用Gmap3框架简化了对Google map API的调用.针对当前旅游信息系统缺乏个性化的信息展示和信息互动现状,本文调用Google Earth API对KML文件进行操作,实现了三维景点信息展示和自助路线的定制.为了共享、融合多源地理数据,利用Google fusion table来帮助后台数据管理和更新.系统可以为游客提供地图浏览、线路查询、旅游资源分布、三维景点旅游以及网友互动功能.     

北京市基础地理信息框架数据初探

结合北京市基础地理信息产品应用现状,提出北京市基础地理信息框架数据概念,开展基于框架数据的制图与可视化表达技术及数据更新机制研究,生产满足不同用户需求的地理信息产品,促进基础地理信息在各行业更加深入应用,为提高北京市地理信息公共服务水平奠定数据基础。     

结合轨迹数据的居民出行模式及功能识别研究

城市人群的出行特征通过车辆轨迹数据隐含的行为信息可以体现,但传统的单维度模型将不再适用于轨迹数据隐含的多维信息的挖掘.本文将海口市中心城区根据路网划分区域,使用能够挖掘多维信息的非负稀疏约束下张量分解基于"滴滴出行"轨迹数据,从时空维度挖掘居民出行规律并进行区域功能特征识别.结果表明:居民出行时间符合工作日,休息日的早...     

阿克苏河-塔里木河水系水质污染遥感监测与评价

 采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的 污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体 污染变化曲线,得出污染物浓度随着远离上游而增加。     

Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data

The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw.     

Landslide risk analysis between Giri and Tons Rivers in Himachal Himalaya (India)

The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies.     

Gravity Changes Before Large Earthquakes in China: 1998-2005

Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200...     

GNSS系统及其技术的发展研究

阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议.     

“4D”技术及其应用

介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。     

Virtual Australia: its key elements – know,think, communicate

Abstract

Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised.     

Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services

Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders.     

地理数据库的关系模型及其实现

本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。     

GIS空间数据的采集误差及其分析

本文详细阐述了GIS数据采集过程中的误差来源，重点分析了通过地图、遥感和摄影测量等方式采集数据所产生的误差及其特性，分析了其对GIS数据的影响与消减方法。