嵌入式GIS跨平台技术的研究与实现

在分析常用软件跨平台技术的基础上,提出了基于嵌入式GIS图形中间件和数据中间件实现嵌入式GIS跨平台的方法.通过构建嵌入式图形接口描述表、图像缓存驱动、图形缓存驱动和GDI适配器的图形中间件以及基于地理空间数据访问引擎、数据管理引擎和数据定制技术的数据中间件,满是了嵌入式GIS快速跨平台开发的需求.     

嵌入式环境下跨平台地图显示技术

现有的移动GIS产品大部分是基于WindowsCE平台用EVC开发的,移植性较差。在多操作系统共存的现实情况下,仅仅开发单一平台的产品无法满足应用的需要,可跨平台GIS提供了这一问题的解决方案。Super-Waba是一个可跨平台的类Java虚拟机,本文提出了基于SuperWaba实现跨平台GIS的流程,并据此开发了嵌入式环境下地图显示系统,具有良好的可移植性。该系统利用PDB(Pilot Database)管理分块地图数据,应用分块数据增量加载策略,很大程度上提高了地图显示速度。实验表明,基于SuperWaba的移动GIS能够灵活地跨平台移植,具有很好的应用前景。     

跨平台嵌入式地图可视化机制研究

针对适应多样性嵌入式操作系统的地图可视化,在分析了嵌入式环境下跨平台技术的基础上,基于中间件技术构建了跨平台的嵌入式地图可视化引擎EMD_EN体系结构,提出了引擎中涉及的面向对象的消息传递机制、基于双缓冲机制的图形显示与控制、嵌入式地图符号库等关键技术解决方案,并给出了基于EMD_EN的跨平台应用软件的开发方法。本文设计的跨平台地图可视化引擎在工程实践中得到检验,应用表明该引擎能比较好的解决跨平台的数字地图显示问题。     

嵌入式GIS图形中间件的设计与实现

导航仪、手机地图等嵌入式GIS已经深入人们日常生活,然而时下开发嵌入式GIS软件时需要针对不同的嵌入式软、硬件平台编写不同的代码.设计并实现了嵌入式GIS图形中间件,基于CG-GDI开发的嵌入式GIS可以在不同的嵌入式软、硬件平台上使用,达到"一套代码,随处运行"的目的.     

插件式GIS应用框架的设计与实现

应用框架已经成为软件开发中一种非常实用的编程规范和设计架构.采用了C#插件式应用开发,并利用ArcGISEngine提供的一套完备的嵌入式GIS组件库和工具库,完成了插件式GIS应用框架的核心即框架宿主程序及各功能插件的设计与实现,以及插件式GIS应用框架平台的设计与实现;采用了动态插件加载配置的开发技术优势,通过可视...     

基于SuperWaba平台的SVG地图显示技术

在移动GIS的客户端解决方案中,目前有很多系统采用JavaME＋SVG技术来解决地图显示,取得较好的效果。但由于在WindowsCE上还没有通用的Java虚拟机,上述移动客户端解决方案存在一定的局限性。介绍一个可以运行于WindowsCE、PalmOS、SymbianOS等嵌入式环境下的一个类Java虚拟机SuperWaba,对基于该平台的SVG地图显示技术作初步探讨,解决移动GIS客户端的跨平台问题。     

基于中间件技术的警务指挥调度系统的设计与实现

阐述基于中间件技术建立警务指挥调度系统的必要性及优势,并结合中间件技术在该系统中的应用方式及作用,描述该系统的软硬件总体架构和主要功能,为搭建基于中间件技术的警务指挥调度平台提供有益参考.     

若尔盖县不动产登记信息管理平台建设应用

以若尔盖县不动产平台建设应用为模式,详细论述了该平台建设的思路、技术方法、数据整合建库及不动产系统管理工作。通过构建服务器、操作系统、数据库系统、应用中间件、GIS平台、网络环境等基础设施,部署Oracle系统、不动产权籍系统、不动产登记系统,并对全县不动产数据进行整合建库,从而建立了若尔盖县不动产登记信息管理平台。     

基于ArcGIS Engine9.3的专题地图制图系统的研究

地图制图是地理信息系统的基本功能,借助ArcGIS Engine9.3这一嵌入式GIS组件技术,在Visual Studio2008软件开发平台下,用C#程序设计语言开发实现了专题地图制图系统,该系统主要借助ArcGIS Engine9.3提供的不同着色方案,通过对不同图层的空间数据赋予不同的颜色和符号来表达某一专题。     

ArcGIS Engine控件综述

ArcGIS Engine是ESRI公司发布的嵌入式地理信息系统软件开发包。基于ArcGIS Engine开发的应用程序一般有3类:独立非可视化应用程序、独立可视化应用程序和嵌入式应用程序,由于ArcGIS Engine提供了一套可复用、跨平台、设计良好的ArcGIS控件,因此利用控件开发可视化的GIS应用程序是一种常用的开发方式。重点探讨了ArcGIS Engine自带控件的功能、使用方法以及与伙伴控件之间的联系机制。     

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.     

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。     

“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.