共查询到20条相似文献，搜索用时 984 毫秒
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基于空间信息服务的电子政务应用系统数据交换研究 总被引：1，自引：1，他引：0
随着电子政务应用系统的推广,数据交换的重要作用越来越引起关注和探讨。本文针对GIS和其他非空间数据的数据共享与自动数据交换应用,提出了由数据传输服务、数据交换适配器和任务处理器三部分组成的数据交换系统模型;引入了XML作为空间数据的逻辑表达及中间数据标准格式,使其具有异构GIS跨平台共享数据资源与服务的能力;数据引擎模型作为GIS和其他非空间数据的事务处理中心,采用工作流管理技术定义复杂分析模型及业务流程;以及不同数据类型驱动的算法设计与实现。 相似文献
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以浙江省地理空间数据交换和共享平台为例,在分析地理信息在线服务平台特点和GIS服务质量需求的基础上,对服务器高可用性、负载均衡技术与构建方式进行讨论,给出省级GIS数据中心高可用性服务器集群和负载均衡服务器集群的设计模型,并描述相关的系统架构、设备部署、负载均衡策略、应用状态检测等方面的内容;最后分析GIS服务性能的模拟测试数据。 相似文献
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从网络环境下地理空间数据分发、使用的安全性角度出发,结合数据加密思想,顾及网络环境中地理空间数据特性,构建了一种面向网络环境的地理空间数据数字水印模型。在此模型基础上,考虑到网络环境中地理数据来源的多样性,建立了水印算法库,对地理数据本身进行数字水印的嵌入。同时,提出一种基于数据包的数字水印算法,算法将水印信息通过映射函数以量化方式嵌入网络传输中的数据包中。试验表明,作为一种面向网络环境的数字水印模型,较好地解决了网络环境下地理空间数据的使用权限控制、版权保护、跟踪管理等问题。 相似文献
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采用B/S技术框架,集成GIS技术、Web Service、SOA等技术实现框架数据后台管理、平台运营维护、服务在线提供等。为了确保共享交换平台的可持续发展,系统软件架构采用面向服务的SOA,基于Web Service技术向政府部门发布地理空间数据服务,通过服务接口实现专业应用系统的定制。还实现了多源数据之间的转换与互操作、跨平台图元编辑器与不同格式的GIS图元数据的互操作。 相似文献
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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。 相似文献
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Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
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. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
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. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
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... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
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. 相似文献
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自动车辆定位导航系统中传感器的误差分析 总被引：1，自引：0，他引：1
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。 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
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。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
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. 相似文献