燃气管网巡检终端数据更新与维护

通过分析巡检终端从网络中下载全部数据存在的问题,本文提出将增量更新应用到巡检终端管网数据更新中。本文的研究基于PDA,在Windows CE系统平台上,运用Visual Studio 2008 c#语言编程,在拓扑一致性基础上更新燃气管网巡检终端的数据。不仅节约了内存和成本,而且提高了更新的效率。     

燃气智能巡检系统设计研究

分析燃气管网巡检工作的特点,提出一种基于Android智能终端,结合GPS、Web Service和GIS技术的智能巡检系统。该巡检系统结合燃气行业业务需求和巡检特点,通过服务端与手机端交互访问,有针对性地进行人员考勤、巡检任务派发和接收、日常巡检、报表统计、管网分析等功能开发,实现燃气系统巡检工作智慧化。     

基于ArcSDE和ArcEngine的管道燃气数据增量更新

采用增量信息文件记录燃气管道的变化信息,将燃气管道及其附属设施数据分为当前数据和历史数据,存储于Oracle数据库中。采用ArcSDE空间数据库引擎和ArcEngine二次开发工具,设计了基于事务机制的更新处理策略,有效地保证了更新过程中数据的完整性和一致性。用C#程序设计语言开发了包括增量信息文件读取,燃气管网数据增量更新、历史数据归档、日志记录等功能的管道燃气数据增量更新自动化处理系统。该系统在海南民生管道燃气有限公司正式应用。本文为管道燃气数据增量更新与历史数据查询提供了一套及时、高效的应用模式。     

基于物联网和GIS的供水管网巡检系统的设计与实现

为了提高供水管网巡检效率,基于GIS和物联网技术设计实现了供水管网巡检系统。该系统能够有效地解决地理信息分析问题,也为管网改造、爆管抢修等业务提供支持,并为管网设备管理提供了科学化、制度化的保障。     

煤层气田智能巡检WebGlS系统的设计与实现

为了提高煤层气生产数据采集效率,达到人员调度的使捷,设计实现了煤层气田智能巡检WebGIS系统。系统融合了GPRS、GPS、GIS等技术,采用B／S和M／S相结合的体系架构,在移动终端结合ArcGISMobile,实现GPS数据解析和定位导航;利用Silverlight技术构建监控室WebGIS,将改进的蚁群算法应用于路径规划,通过GPRS技术实现巡检数据和巡检任务等信息的无线实时传输,基本实现巡检工作的智能化、实时化。     

成都自来水管网移动巡检系统的设计与实现

为了改善成都自来水管网巡检模式、提高巡检效率、加强巡检管理,基于ArcGIS平台和Android系统,利用GIS,3G,GPS等技术,构建了成都自来水管网智能终端巡检系统和监控端GIS系统,实现了自来水管网巡检可视化、智能化和巡检监控可视化、科学化,有效地提高了成都自来水管网巡检质量和效率。     

基于北斗RTK的安卓管网GIS系统开发

研究了移动GIS开发技术,并且接入北斗接收机实现移动GIS的手簿差分,在Android端实现厘米级RTK定位,在地图方面切片高精度栅格和矢量底图,实现GIS数据的符号化显示、放样、数据采集及属性查询,矢量GIS的分级数据加载,避免了GIS数据运行卡顿的情况,在巡查中定位精度可达2—5 cm,已应用在管网巡检项目中,且效果良好。     

基于ArcGIS的协同克里金法预测燃气管网空间分布

燃气低压管网的合理高效规范化管理是燃气普及、管线巡查、实时预警和应急响应的基本保障.我国燃气管网发展虽然迅速,但终端用户的低压管网仍存在很多规划和管理上的不足.互联网大数据时代的兴起为燃气行业终端用户的智能管理提供了潜在机会.本文基于GIS空间分析功能,把燃气管网系统扩展深入到街道级管理模式,分析区域管理中低压管网的空...     

城市三维管网地理信息系统的设计与开发

数据层是系统的服务器端,采用Geodatabase一体化集成管理管网数据等所有系统数据.表现层与业务逻辑层是系统的客户端,基于ArcEngine的组件接口与界面控件开发,介绍了主要功能的关键技术实现及功能界面,实现了基本GIS功能、管网可视化功能、管网分析功能与三维地形分析功能,为管网自动化管理提供了新方法和新思路.     

浅谈城市数字化煤气管线的测量方法

管线测量工作在城市建设中占有很重要的地位,本文以山西省临汾市煤气管线监测网建设为例,论述了城市数字化煤气管线测量的方法和流程,即现状调绘→探测→数据采集与成图→成果验收→数据建库.通过建立现代化的燃气管网动态管理系统,生成一整套完整、精确的各种数据,实现对临汾市燃气管网的科学管理和建设,使临汾市的燃气输配事业沿着可持续发展的道路前进.     

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.     

使用FME与VBA提取机场方格网高程数据

因受机场工程设计软件的测量数据容量限制,基于LiDAR采集、点云分类后得到的地面点云数据LAS不能完整应用于目前设计软件进行设计计算。本文通过对拟选技术方案的筛选,提出了利用FME Workbench数据处理功能,结合VBA编程获取外部方格网平面数据的方法。该方法在FME Workbench中实现了地面点云数据构建TIN、采用逐点内插方法从TIN中提取方格网高程数据、等高线生成及相应图形处理与成果输出。最终通过实际算例证明了该方法的有效性。     

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.     

自动车辆定位导航系统中传感器的误差分析

对国界定位导航系统中几种常见的辅助传感器所产生的误差进行了分析，导出了不同传感器的误差模型。这些误差模型是估计车辆位置的扩展卡尔曼滤波器的基础，同时也为选择适当的传感器提供了理论根据。