基于Google Earth的GIS数据管理系统的设计与实现

Google Earth作为公共地图服务平台,为测绘、勘探等工作提供了数据支持。本文探讨了开发应用软件,将GIS数据批量转换为Google Earth数据的关键技术,实现了数据管理、数据转换等功能。     

Virtual Earth API在Web地图服务中的应用

自2005年地图搜索服务兴起以及Google公司在线地图Google Map的发布,web地图服务成为新一轮竞争热点,微软、雅虎及亚马逊等公司纷纷参与竞争。本文介绍了微软Virtual Earth API最为重要的几个功能及其实现方法,演示了使用Virtual Earth技术建立Web地图服务的方法,为学习微软Virtual Earth制图技术和使用Virtual Earth地图控件提供借鉴。     

一种快速开发3维WebGIS的方法

讨论了一种快速开发3维WebGIS的方法,该方法使用Google公司推出的SketchUp和Google Earth JavaS-cript API实现,随后通过一个3维校园实例予以说明。实例证明,基于Google Earth JavaScript API,用户可以快速开发出易于部署、成本低廉、通用性好的个性化3维We...     

基于Google Map API的校园电子地图开发

Google Map API为用户提供向Google地图添加各种个性化内容的功能,用户在此基础上进行二次开发,可实现各类网络地图服务。利用Google Map API开发校园电子地图,实现电子地图的各项基本功能,并探讨功能实现中的关键部分设计。     

基于Google Earth API的二次开发研究

Google Earth是一款浏览地球三维影像的桌面软件,提供了大量多分辨率的全球影像数据,作为一个开放的地理信息服务系统,越来越多的用户以工具软件或开发平台的形式将它成功地应用在许多行业。Google Earth提供了开放的API,允许人们进行二次开发。较详细地介绍基于Google Earth API二次开发的基本知识、开发方式和开发技巧等。     

基于MFC和GIS平台的三维地图导览系统

目前,很多单位和高校都在进行区域三维地图的建设,数字化的三维地图不仅可应用于建设和施工规划,也可应用于生活实践、地理信息分析等方面。本文以某大学新建校区为例,基于Google Earth的GIS平台搭建由全站仪施测、以AutoCAD和SketchUp制作的三维校园BIM模型,再利用MFC和COM API技术进行程序封装和基于C/S的软件开发,制作出一个可移植的区域三维地图导览系统。该系统不仅可以实现基本地物的三维展示和自由漫游,也可以实现查询、路径导航等一系列GIS分析功能。     

基于Google Maps API的网络地图服务系统的研究与应用

以Google Maps为代表的地图服务的推出开创了全球化地理信息服务新的开端,GoogleMaps提供的API具有开放式、低成本和易用性的特点,使其应用更加广泛。通过介绍Google Maps的功能、特点和Google Maps API的使用方法,探讨了Google Maps API在网络地图服务中的应用。     

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.     

基于Google Map API的天气实况显示系统

谷歌地图应用程序开发包提供了各种向地图添加内容的服务,用户能够在网站上创建功能全面的地图应用程序。利用Google Maps API和Ajax技术,建立了气温、湿度等天气实况信息在Google Map中快速显示的WebGIS系统。实践证明,该方法提高了系统的开发速度,缩短了开发周期,优化了人机交互。     

基于ArcEngine与OGR库的Shapefiles文件到KML格式转换方法研究

Google Earth的问世,给GIS行业注入了新的活力,但对GIS的核心和重要功能--空间分析的支持几乎为零.本文首先使用ArcGIS Engine实现了Shapefiles文件的缓冲区分析功能,然后通过ArcGIS Engine和OGR库把缓冲区分析结果的Shapefiles文件转换为KML格式,从而将缓冲区分析的结果在Google Earth中显示出来,间接地增强了Google Earth缓冲区分析的功能.     

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。