共查询到20条相似文献，搜索用时 109 毫秒
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本文首先对天球参考标架和地球参考标架作了一般叙述。其次较详细地说明地球参考标架究竟是什么,它是如何形成的,直到现在它的发展情况。最后说明了地球参考标架在有关学科中的应用。 相似文献
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现代大地测量参考系统 总被引：16，自引：0，他引：16
概述现代大地测量参考系统的定义及不同参考系统之间的关系。主要讨论我国当代大地测量界常使用的3种用以表示几何位置的参考系统－1980年国家大地坐标系、全球大地测量系统1984（WGS84）、国际地球参考系统（ITRS），和一种用以表示物理位置，高程的参考系统－1985年国家高程基准。并讨论大地测量中框架和基准的概念。 相似文献
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本文综合叙述了ＩＴＲＦ的原点,尺度,定几以及关于垂直基准方向的问题,可供了解使用ＩＴＲＦ和参与ＩＴＲＦ有关工作以及事空间大地测量观测与数据处理者参考。 相似文献
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大地测量学近年来的发展特点——参加国际大地测量协会(IAG)2001年科学大会札记 总被引：3，自引：0，他引：3
对国际大地测量协会（IAG）2001年科学大会所讨论的几个科学技术问题作了部分介绍。其中包括大地测量近20年来的进展，地球参考框架和地球重力场研究的新成果，对GPS天气预报的技术要求等。 相似文献
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《测绘信息与工程》2006,31(4):9
由武汉大学和国际大地测量协会（IAG）主办、武汉大学测绘学院承办的“第六届Hotine-Marussi理论和计算大地测量国际研讨会”在武汉大学国际学术交流中心开幕。来自中国、德国、美国、希腊、法国、意大利、荷兰、日本、中国香港、中国台湾等国家和地区的170多位代表参加了开幕式。会议的主题是现代大地测量的机遇和挑战，包括时变重力场和地球动力学，卫星重力测量的理论发展，地壳形变及其地球物理解释，利用现代大地测量手段监测地球环境和灾害，GNSS理论、算法及其工程应用，参考框架的定义和维持，边值问题及逼近理论，大地测量反演理论及应用，统计估计和预测理论，数据融合等。 相似文献
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完善大地坐标框架和地球重力场时变测量的进展--2005年国际大地测量协会(IAG)科学大会札记 总被引：1，自引：0，他引：1
国际大地测量协会(IAG)科学大会于2005年8月22～26日在澳大利亚凯恩斯(Cairns)召开.会议名称为"动力行星2005"(Dynamic Planet 2005).着重介绍会议在有关完善全球和地区性大地坐标参考框架、卫星重力测量在确定地球重力场时空分辨率方面、建立和完善全球大地测量观测系统(GGOS)等方面学术报告的内容. 相似文献
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分析了构建国际组织时空数据模型的意义,总结了国际组织数据的时空特征,比较了几种有代表性的时空数据模型的特点及缺陷,对基态修正模型进行扩展和改进,设计了国际组织时空数据模型。在此基础上,设计了国际组织时空数据库,并给出实例。 相似文献
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国际地球参考框架2000(ITRF2000)的定义及其参数 总被引：10，自引：1，他引：10
陈俊勇 《武汉大学学报(信息科学版)》2005,30(9):753-756,761
对国际地球参考框架2000(ITRF2000)的定义、主要参数及其应满足的条件进行了研究,重点指出了它和历史上的各个ITRFyy的不同,并阐述了各个ITRFyy的联系和区别,给出了它们之间相互转换的参数。 相似文献
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国外测绘机构大地测量的新动向 总被引：2，自引：1，他引：1
本文概述国外测绘机构大地测量的动向 ,目的在于了解全球大地测量的发展趋势 ,作为借鉴。综观各国的大地测量动向可以看出 ,高精度国家大地控制网的建立 ,都是采用 GPS,无一例外 ,而且它们之间只是细节上的差异。从各国建立高精度大地控制网的目的来看 ,都是为多学科服务的。面对这样的总趋势 ,大地测量工作者必须拓宽知识面 ,迎接新的挑战。 相似文献
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国际重力卫星研究进展和我国将来卫星重力测量计划 总被引：12，自引：3，他引：9
本文首先分别介绍了国际已经成功发射的专用地球重力测量卫星CHAMP、GRACE以及即将发射的GOCE、GRACE Follow-On和专用月球重力探测卫星GRAIL的研制机构、轨道参数、关键载荷、跟踪模式、测量原理、科学目标和技术特征;其次,阐述了当前相关学科对地球重力场测量精度的需求;最后,建议我国在将来实施的卫星重力测量计划中首选卫星跟踪卫星高低\低低模式,尽快开展轨道参数优化选取的定量系统研究论证和重力卫星系统的误差分析,依据匹配精度指标先期开展重力卫星各关键载荷的研制以及尽早启动卫星重力测量系统的虚拟仿真研究。 相似文献
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Cloud computing has been considered as the next-generation computing platform with the potential to address the data and computing challenges in geosciences. However, only a limited number of geoscientists have been adapting this platform for their scientific research mainly due to two barriers: 1) selecting an appropriate cloud platform for a specific application could be challenging, as various cloud services are available and 2) existing general cloud platforms are not designed to support geoscience applications, algorithms and models. To tackle such barriers, this research aims to design a hybrid cloud computing (HCC) platform that can utilize and integrate the computing resources across different organizations to build a unified geospatial cloud computing platform. This platform can manage different types of underlying cloud infrastructure (e.g., private or public clouds), and enables geoscientists to test and leverage the cloud capabilities through a web interface. Additionally, the platform also provides different geospatial cloud services, such as workflow as a service, on the top of common cloud services (e.g., infrastructure as a service) provided by general cloud platforms. Therefore, geoscientists can easily create a model workflow by recruiting the needed models for a geospatial application or task on the fly. A HCC prototype is developed and dust storm simulation is used to demonstrate the capability and feasibility of such platform in facilitating geosciences by leveraging across-organization computing and model resources. 相似文献
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The discovery of and access to capacity building resources are often essential to conduct environmental projects based on Earth Observation (EO) resources, whether they are Earth Observation products, methodological tools, techniques, organizations that impart training in these techniques or even projects that have shown practical achievements. Recognizing this opportunity and need, the European Commission through two FP7 projects jointly with the Group on Earth Observations (GEO) teamed up with the Committee on Earth observation Satellites (CEOS). The Global Earth Observation CApacity Building (GEOCAB) portal aims at compiling all current capacity building efforts on the use of EO data for societal benefits into an easily updateable and user-friendly portal. GEOCAB offers a faceted search to improve user discovery experience with a fully interactive world map with all inventoried projects and activities. This paper focuses on the conceptual framework used to implement the underlying platform. An ISO19115 metadata model associated with a terminological repository are the core elements that provide a semantic search application and an interoperable discovery service. The organization and the contribution of different user communities to ensure the management and the update of the content of GEOCAB are addressed. 相似文献
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Lena Halounová 《地球空间信息科学学报》2021,24(1):22-26
PREFACE
The paper contains a brief overview of the professional activities of Professor Gottfried Konecny,Professor Emeritus at the Institute of Photogrammetry and GeoInformation,Leibniz University Hannover,Germany,and his influence on photogrammetry,remote sensing and geospatial infor-mation science during his time at the University of New Brunswick,Canada,and at the Leibniz University.His work can be divided into educational,scientific,application,organizational,and work in international societies.Additional activities comprised of giving courses in various languages,consultancy activities,and various other cooperations which took place in many South American countries,in Africa and Asia,for organizations such as the World Bank,United Nations,German Space Agency DLR,to name only a few.Activities in connection with international societies mainly took place during Prof.Konecny's engagement in the Council of the International Society for Photogrammetry(ISP),renamed the International Society for Photogrammetry and Remote Sensing(ISPRS),and the European Association of Remote Sensing Laboratories(EARSeL)Bureau.He was a key figure in bringing many countries and organizations to ISPRS as Ordinary and Sustaining Members.Professor Konecny has always been aware of the importance of international cooperation at various levels,also with sister societies such as the International Cartographic Association and the United Nations-Global Geospatial Information Management(UN-GGIM).His application activities span from the photogrammetry-oriented projects he was awarded in Canada,to remote sensing topics and geospatial sciences,combined with cartography during his Hannover period.His vision and endless effort are exemplary for a person who has always been devoted to the three geosciences mentioned above.Professor Konecny is the author of a number of books,journal papers and papers presented at international and national conferences.He has been a recognized keynote speaker at many conferences throughout the world due to his vast experience.This paper describes 75 years of a man who is an expert in fields which arose during his academic life. 相似文献
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探讨地理世情监测标准规范建设的需求与意义,归纳梳理国内外相关标准规范建设的现状,分析目前我国地理世情监测标准规范建设存在的不足,提出相关建议,以推动地理世情监测工作的开展。 相似文献
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The NCGIA core curricula in GIS and remote sensing 总被引：1，自引：0，他引：1
KAREN K KEMP 《Transactions in GIS》1997,2(2):181-190
Since the development of the original NCGIA Core Curriculum in GIS (Goodchild and Kemp 1990), the National Center for Geographic Information and Analysis has been providing support and direction to the GIS education community. Following the success of the original Core Curriculum, three new curricula are now under development. All are being constructed and distributed on the World-Wide Web and involve international authorship and editorial input. This paper outlines the origins of these projects and some of the issues related to the development of Web-based instructional materials that they raise. 相似文献
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Cartographica incognita: ‘Dijital Jedis’, Satellite Salvation and the Mysteries of the ‘Missing Maps’ 总被引：1，自引：0，他引：1
Catherine Turk 《The Cartographic journal》2017,54(1):14-23
Like Participatory Geographic Information Systems (PGIS) and Public Participation Geographic Information Systems (PPGIS) crowdsourced collaborative mapping is often imagined as an alternative to conventional cartographic practice. This paper examines collaborative mapping projects designed to assist in humanitarian work and respond to catastrophes. These projects, their technological complexity and wide range of collaborators, including affected locals, international Non-Government Organisations (NGOs) and anonymous online contributors, invite closer consideration. In this article I unpick the gnarly question of how the remote sourcing of information through cloud collaboration and satellite imagery jostles with grounded work encouraging local control of local geoinformation. My critical analysis of these projects explores: (1) justifications for action – what is being promised through digital mapping as aid or satellite salvation?; (2) forms of participation – the role of ‘hotties’ ‘nodders’ and ‘digital jedis’; and (3) contingencies of mapping practices and the assemblages of actors within which they are embedded – as the mysteries of the ‘missing maps’. The conclusion considers differing approaches towards the inclusion of local knowledges within participatory digital aid mapping and identifies remote mapping practices that are both incognito and incognisant. 相似文献