网络RTK技术在管线测量中的应用

随着GPS技术的不断发展,GPS-RTK技术已广泛的应用于现代城市工程测量中。文章阐述了网络RTK的工作原理、优越性及它在工程测量中的应用,并以某管线测量项目为背景,详细介绍了其作业流程以及网络RTK技术在其中的具体应用方法。     

Climatic Variations In The Moisture and Instability Patterns Of The Atmospheric Boundary Layer On The East Mediterranean Coastal Plain Of Israel

A long-term record (1964–1995) of radiosonde data observed atthe Bet-Dagan aerological station of the Israel Meteorological Service was analyzed to detect possible temporal trends in moisture content and instability of the atmospheric boundary layer. Bet-Dagan issituated in the central part of the south-east Mediterranean coastal plain. During this period surface characteristics in this region have changed drastically due to changes in land use, i.e., urbanization, development of irrigated agriculture and afforestation. The analysis of the radiosonde data reveals a clearly defined, statistically significant, increasing trend in the moisture content, mainly during summer. The stability of the surface layer, characterized by the bulk Richardson Number, shows adecreasing trend since the early 1960s. Relationships between these trends, land-use modifications and possible influence of large-scale influence are discussed.     

基于OpenGL的3维虚拟林相研究

本文介绍了研发虚拟林相三维可视化系统的技术流程与实现方法,该系统研发基于目前较流行的以Visual StudioC＋＋开发组件调用OpenGL三维图形库的方法,自主研发出虚拟林相三维可视化系统。该系统按三角带组织DEM数据并读入VC,采用LOD、四叉树技术自主研发了标准真实DEM数据构建三维地形的导入引擎,实现了地形可视化以及一些基本功能。为还原真实的地形地貌．应用OpenGL中的纹理映射、光照、场景分割、反走样、八叉树、雾化等三维可视化特性,增强了三维可视化效果。     

Geolokit: An interactive tool for visualising and exploring geoscientific data in Google Earth

Virtual globes have been developed to showcase different types of data combining a digital elevation model and basemaps of high resolution satellite imagery. Hence, they became a standard to share spatial data and information, although they suffer from a lack of toolboxes dedicated to the formatting of large geoscientific dataset. From this perspective, we developed Geolokit: a free and lightweight software that allows geoscientists – and every scientist working with spatial data – to import their data (e.g., sample collections, structural geology, cross-sections, field pictures, georeferenced maps), to handle and to transcribe them to Keyhole Markup Language (KML) files. KML files are then automatically opened in the Google Earth virtual globe and the spatial data accessed and shared. Geolokit comes with a large number of dedicated tools that can process and display: (i) multi-points data, (ii) scattered data interpolations, (iii) structural geology features in 2D and 3D, (iv) rose diagrams, stereonets and dip-plunge polar histograms, (v) cross-sections and oriented rasters, (vi) georeferenced field pictures, (vii) georeferenced maps and projected gridding.Therefore, together with Geolokit, Google Earth becomes not only a powerful georeferenced data viewer but also a stand-alone work platform. The toolbox (available online at http://www.geolokit.org) is written in Python, a high-level, cross-platform programming language and is accessible through a graphical user interface, designed to run in parallel with Google Earth, through a workflow that requires no additional third party software. Geolokit features are demonstrated in this paper using typical datasets gathered from two case studies illustrating its applicability at multiple scales of investigation: a petro-structural investigation of the Ile d’Yeu orthogneissic unit (Western France) and data collection of the Mariana oceanic subduction zone (Western Pacific).     

基于Web Services的星历计算服务平台设计及其实现

为克服复杂耗时的星历计算,基于兼备计算精度高、时间跨度长、内容丰富等优点的Swiss Ephemeris星历计算程序包,利用JNI和Web Service等新兴的技术,我们设计出了一套面向星历研究人员和天文程序开发人员的星历计算服务平台——China-VO Ephemeris WS,并且以日食带的中心食带绘制为例,具体介绍了China-VO Ephemeris WS的功能和使用。     

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??????????????????GPS/VRS????????,??????IGS?????????????GPS?????????????????????????GPS/VRS????ο???????VRS?????????????????????????GPS???????вο?????磨SGRSN????????????GPS??????磨SCIGN????????????????????????г?????????????????????????·??????и??????????????????????????????????0.004??10 ^-6??????????100 km?????RTK??λ??????????????????GPS/VRS????????????RTK??λ???????????????     

Virtual Field Geologic Trip System

1IntroductionThe objective of developing Virtual Field Geo-logic Trip System (VFGTS)is for geologic educa-tion and research, 3D geologic information system. The key technique of VFGTS is scientific visualiza-tion. In a virtual geologic world users can have a geologic exploration, observation and research. The technique of visualization appeared in 1987. It is a technique of transforming the data gained by experiment or numerical calculation into the image which can be accepted…     

中国虚拟天文台软件集成

虚拟天文台是一个通过先进的信息技术把全球范围内的天文研究资源无缝透明地联结起来组成的数据密集型在线天文研究环境。文章首先论述了在虚拟天文台系统中进行现有软件集成的必要性和可行性;并分析了软件集成的粒度问题;其次详细介绍了将现有软件封装为服务的常规方法;最后,介绍了ImageMagick图像处理软件的具体封装和实现流程,并作了详细讨论。     

中国虚拟天文台研发策略与重点

由于不同的天文和技术背景，不同的虚拟天文台项目采取了不同的研究策略。本文首先介绍了国际上几个典型虚拟天文台项目的研发目标和工作重点；然后讨论了包括中国虚拟天文台在内的小型虚拟天文台项目在研发方面的优势和劣势。中国虚拟天文台项目根据自身所处的具体情况确定自己将走应用路线，争取在某些领域取得突破，研发重点包括五个方面：China-VO系统平台建设、国内外天文数据的统一访问、现有天文工具的虚拟天文台集成、天文设备的虚拟天文台集成、虚拟天文台基础上的公众教育。     

中国虚拟天文台体系结构

虚拟天文台是天文技术和信息技术结合的产物，其体系结构体现着与最新信息技术的结合。本文首先介绍虚拟天文台的工作流程和原理，进而介绍了虚拟天文台体系结构研究的最新进展。以网格技术为基础，给出了中国虚拟天文台的层次式体系结构和服务式体系结构。