利用全站仪测量地形要素顶部特征点的方法   总被引：1，自引：0，他引：1  

范玖国  王全全  周志斌  张广兴  姜元军 《测绘科学》2011,36(2):221-223

本文主要研究了全站仪在三维数字地形图测绘中的应用,获得三维地形图要素的底部特征点相当简单,关键是地形要素顶部特征点利用全站仪是怎样获取的,本文通过几种方法和对应的实测数据对这方面问题进行了研究和分析,最后得出全站仪测量三维数字地形图可行性.  相似文献   

GIS科普资源发布系统实现的关键技术     

袁家勇  公茂玉  高诗亮 《测绘科学》2011,36(3):239-240,218

科普资源发布系统利用GIS强大的空间查询与分析功能,方便市民浏览、查询与统计科普资源情况,掌握更多科普知识.本文主要论述了系统设计与实现过程中应用的关键技术,详细给出了栅格影像自动选择的方法,矢量栅格匹配的原理,以及统计图的绘制技术.最后介绍了系统的开发模式与软件环境,给出了统计效果图.  相似文献   

互联网电子地图网站的设计与应用     

李大超 《现代测绘》2011,34(4):60-61,64

概述了基于电子地图网站的设计思路,并就网站的应用提出了相应的建议,互联网电子地图网站是公共地理信息服务的一个有效应用。  相似文献   

《河南省市县两级行政区域界线详图集》的设计与编制     

杨晓超 《地理空间信息》2011,9(2):147-149

<河南省市县两级行政区域界线详图集>是根据法定行政区域界线协议书附图、协议书和界桩坐标等界线资料、成果编墓而成的带状地图集.首先对详图集的基本形式和主要内容、特点进行了介绍;然后对图集的技术流程及要求进行了说明,并对编制过程中出现的主要技术问题进行了探讨;最后总结了编制发布该图集的重要意义.  相似文献   

地理信息系统在江苏省公益林分布图制作中的应用     

杨志红  李向阳  李超 《现代测绘》2011,34(3):50-51

运用地理信息系统(GIS)研制了江苏省公益林分布图,总结了公益林分布图制作的原理、方法、技术路线和特点。为江苏省公益林进行信息化管理奠定了基础,为发展高效林业提供了科学的决策和管理平台。  相似文献   

Transmission and visualization of large geographical maps   总被引：1，自引：0，他引：1  

Liqiang Zhang  Liang ZhangYingchao Ren  Zhifeng Guo 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(1):73-80

Transmission and visualization of large geographical maps have become a challenging research issue in GIS applications. This paper presents an efficient and robust way to simplify large geographical maps using frame buffers and Voronoi diagrams. The topological relationships are kept during the simplification by removing the Voronoi diagram’s self-overlapped regions. With the simplified vector maps, we establish different levels of detail (LOD) models of these maps. Then we introduce a client/server architecture which integrates our out-of-core algorithm, progressive transmission and rendering scheme based on computer graphics hardware. The architecture allows the viewers to view different regions interactively at different LODs on the network. Experimental results show that our proposed scheme provides an effective way for powerful transmission and manipulation of large maps.  相似文献   

Assessment of Erythemal UV Level in Nepal Based on Solar UV Estimates from Total Ozone Mapping Spectrometer     

Binod Kumar BHATTARAI  Berit KJELDSTAD  Trond Morten THORSETH 《大气科学进展》2011,28(4):789-796

Nepal lies on the southern slope of Himalaya in Asia. In a width ranging between 150 and 250 km, the altitude varies greatly from about 100 m at its southern border to a maximum of 8848 min the northern part. Like the variation in altitude, climatic condition varies quite a lot. Long-term monthly mean erythemal UV daily dose values for Nepal are evaluated using Total Ozone Mapping Spectrometer (TOMS) estimation from the time of its overpass between 1996 and 2003. The results are presented as summer and winter maps of mean UV levels in each satellite grid. The mean winter erythemal UV daily dose ranges between 2.1 and 3.6 kJ m-2 whereas summer values are found to lie between 4.6 and 9.7 kJ m-2. The altitude variation increases the UV levels by about 0.2 kJ km-1 in winter months, and 0.9 kJ km-1 in summer. A multiyear monthly average erythemal daily dose in most of the areas shows that the summer value is about three times higher than that in winter. Although year-to-year variation is not pronounced in high- and mid-elevation regions, UV levels seemed to decrease from 1997 to 2002 in the southern part of the country in the low elevation region by about 5.35%. Due to the combined effects of the altitude, low ozone concentration in the troposphere, and thin air, surface UV radiation at higher altitudes is found to be higher than in the surrounding regions.  相似文献   

网络地图集成于 GIS桌面系统的方法及试验     

李木梓  徐柱  黄泽纯  卢彩霞  穆永磊 《地球信息科学学报》2011,13(1):95-101

网络地图可以快捷地提供海量空间数据,用户可通过其提供的API方便地将其嵌入到定制的网络应用中,同样,将其集成到功能丰富的GIS桌面系统中是必要的、有益的.但目前主流的网络地图如Google地图、Bing地图等,与主流GIS桌面系统所支持的OGC的WFS、WMS、WCS等空间数据服务发布规范不兼容,因而不能被GIS桌面系...  相似文献   

导航电子地图增量式更新服务模式     

郭鹏  崔铁军 《地理信息世界》2011,(4):57-61

为了解决导航电子地图数据生产成本高昂、更新周期长等问题,提出了由导航变化数据发现、分析、采集、制作、发布构成的导航电子地图增量式更新闭环服务模式,将公众和导航数据用户等非专业数据生产人员纳入到导航电子地图数据维护和更新框架,可以提高数据的现势性,而且大大地降低生产和应用成本,为导航电子地图服务提供了一种可操作性强的参考...  相似文献   

Paleoenvironment reconstructions and climate simulations of the Early Triassic: Impact of the water and sediment supply on the preservation of fluvial systems     

《Geodinamica Acta》2013,26(6):431-446

Paleoenvironmental reconstructions and climatic modelling allow us to investigate the influence of water and sediment supply on the preservation of fluvial systems within a given geodynamic context. To simulate climate, we need global-scale paleoenvironmental and paleotopographic reconstructions. However, the present study only covers the West-Tethys domain, where sedimentological and stratigraphic data allow us to check climate simulation results against geological data. We focus our modelling on the Olenekian, with the aim of characterizing the impact of climate on fluvial sedimentation in the West-Tethys domain. The climatic simulations show that paleoclimates differ between Western Europe and North Africa. A more humid climate is simulated over North Africa, whereas a rather arid climate prevails over Western Europe. In Western Europe, the sediments are preserved for the most part in endoreic basins and the presence of rivers in an arid environment suggests that these rivers are mainly fed by precipitation falling on the North Africa Variscan Mountains. In North Africa, sedimentation is exclusively preserved in exoreic basins (coastal plain sediments). Consequently, the lack of preserved fluvial systems in endoreic basins in North Africa either could be due to a shortage of accommodation space in this area, or is linked to the climatic conditions that controlled the water and sediment supply.  相似文献