共查询到20条相似文献，搜索用时 203 毫秒
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基于开源软件的WebGIS服务器构建 总被引：2，自引：0，他引：2
随着Internet的发展,WebGIS已经成为GIS发展的必然趋势.开源软件具有成本低、稳定性和安全性高的优点,成为许多中小型WebGIS项目的首选.本文先是介绍了WebGIS的基本原理,然后选择了需要的开源软件:开源操作系统Linux、开源应用软件Apache、MapServer、PostgreSQL/PostGIS,之后使用这些软件构建了WebGIS服务器并论述了服务器工作流程,最后介绍了开源WebGIS的一个具体应用. 相似文献
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简单介绍了GeoServer、PostGIS、OpenLayers等几种开源GIS软件以及GML的一些基础知识,并利用这些开源软件构建WebGIS实现的系统框架,提出了利用4层B/S架构来构建WebGIS框架,为WebGIS的构建提供新的思路。 相似文献
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针对生活中常见的二维电子服务地图,本文探讨了运用于已知的路径数据接口在2.5D电子地图上来实现3种路径规划的WebGIS设计方案。该项目将基于开源的Openlayers JavaScript类库包,实现公交路线、自驾路线、步行路线的查询、显示、路线详细展示以及模拟实现导航功能。就实际研发过程中遇到的问题探讨解决方案,实现了基于OpenLayers的2.5D电子地图路径规划。 相似文献
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本文在日志管理与分析应用中引入先进的地理信息系统技术,选择Apache Server、MapServer、PostGIS等开源软件,建立WebGIS日志管理与分析系统。系统不但具备日志属性数据的管理、检索等基本功能,并利用日志地理数据实现空间统计信息的动态对比分析与空间查询功能,还能够自动警告管理员异常事件的发生。现场运行结果表明,该系统能够以工具的形式,方便有效地被不同管理员所使用,满足用户的具体要求。 相似文献
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介绍了当前WebGIS的发展趋势和WebGIS开发技术和框架,分析了优势和不足.通过选择合适的开源技术库构建了一个轻量级的WebGIS开发框架,并详细介绍了该框架的组成.利用该技术框架开发了我国水产生物资源分布查询系统.结果表明,使用该框架开发能够快速构建跨平台的GIS应用. 相似文献
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基于网络发布地理信息数据主要是以网络地图服务的形式被广泛应用。开源WebGIS软件应用架构包括数据存储、分析处理应用和发布,对应的应用架构分为数据库技术、客户端软件和服务器端软件。本文通过建立开放式框架结构,结合客户端浏览器、Ajax技术、PostgreSQL数据库以及PostGIS空间插件,尝试将客户端技术运用到GIS空间数据服务中,实现了基于Ajax技术的地图服务的应用。 相似文献
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曾德培 《测绘与空间地理信息》2021,44(9):80-82
结合湖南省电力设计院有限公司电力工程测绘项目管理需要,采用PostGIS数据库、GeoServer服务器和OpenLayers框架等开源GIS技术研发了电力工程测绘项目管理信息系统.该系统实现了测绘人员、仪器设备、工程进度和成果数据的集中有效管理,提升了电力工程测绘项目管理水平,有效提高了工作效率. 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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“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
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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