大连市沿海丘陵地区地铁精密控制网关键技术研究     

刘伟 《测绘与空间地理信息》2017,(10):205-206,210

介绍了大连市沿海丘陵地区地铁施工控制网布设、观测中关键技术的研究及解决方案,其中利用GPS静态观测与传统精密导线测量相结合组成混合网平差、将精密导线点纳入二等水准网,实现平高复用等技术,可给同类工程实施提供参考。  相似文献   

Applying VGI to collaborative research in the humanities: the case of ARTL@S     

Catherine Dossin  Nicole Ningning Kong 《制图学和地理信息科学》2017,44(6):521-538

ABSTRACT

Using Artl@s as an example of a project that relies on volunteered geographic information (VGI), this article examines the specific challenges that exist, beyond those frequently discussed in general VGI systems (e.g., participants’ motivation and data quality control) in regard to sharing research data in humanities: (1) most data from the humanities is qualitative and collected from multiple data sources which are often inconsistent and unmappable; (2) data is usually interconnected with multiple relationships among different tables which creates challenges for both mapping and query functionality; (3) data is both geographical and historical. Consequently addresses that no longer exist have to be geolocated and visualized on historical basemaps and spaces must be represented diachronically; (4) the design of web map application needs to balance both sophisticated research requirements and a user-friendly interface; (5) finally contributors expect their data to be cited or acknowledged when used in other studies and users need metadata and citation information in order to reuse and repurpose datasets.

In this article, we discuss how Artl@s, a project which developed a georeferenced historical database of exhibition catalogues, addresses these challenges. Artl@s provides a case study for VGI adoption by digital humanities scholars for research data sharing, as it offers features, such as flexible batch data contribution, interrelated spatial query, automatic geolocalization of historical addresses, and data citation mechanisms.  相似文献   

三角高程法超长距离跨海高程传递实验研究   总被引：2，自引：0，他引：2  

吴迪军  李剑坤  何广源 《测绘科学》2017,(12):195-200

针对三角高程法跨海高程传递测量误差的来源问题,该文提出了基于三角高程法的超长距离跨海高程传递方法,设计了具体的测量方案,包括跨海场地选定与布设,观测标灯设计与制作,跨海观测时段数、测回数及组数设计,观测程序与观测方法、观测成果的限差验算与成果取舍等,并提出了跨海高程传递精度评定的两种方法。在平潭海峡公铁两用大桥工程现场选定两条跨海线进行了实验研究,实验结果表明,13.9km和18.0km跨距的跨海高差平差值与已知高差的较差均小于二等水准测量限差,每千米跨海高程测量中数的中误差分别为±0.68mm和±0.63mm。  相似文献   

我国极地航运能力建设和高冰级船队发展对策分析          下载免费PDF全文

寿建敏 《极地研究》2018,30(4):419-428

我国在南极和北极的活动日益增多,参与南北极事务和争取极地资源的利用已经成为国家未来向外扩展的重要举措之一。随着气候变暖,极地冰融速度加快,尤其是北极航运窗口期越来越长,两极资源利用和科考活动的需求量越来越大。而目前我国用于航行两极,尤其是北极的高冰级商业化船队十分缺乏,航运的陆基支持保障能力缺少,这将严重影响我国极地事业和商业航运运营的发展。本文通过对不同冰级船舶的保有量、建造技术能力、船舶运营和极地港口设施等各环节的分析,得出我国缺乏带较高等级冰级符号且可抗浮冰厚度1m及以上的极地航行船舶、相应极地航运能力不足的结论,并提出了我国建设极地航运能力的对策建议,为我国建设一支能在极地航行且带较高等级冰级符号船舶的船队、破冰船队以及建设极地陆基航运支持保障能力等提供决策参考。  相似文献   

地基主动式云自动观测设备外场比对试验   总被引：1，自引：0，他引：1  

胡树贞  陶法  马舒庆  张雪芬 《气象科技》2017,45(6):988-994

对2015年1—5月安装在中国气象局大气探测试验基地的Ka波段毫米波测云仪(HT101)和2种型号激光云高仪(CYY-2B、HY-CL51)进行比对试验。试验期间以L波段业务探空气球的入云和出云高度为云高标准,对测云仪从云体探测率、准确性、天气适应性等方面进行分析,结果表明:(1)毫米波测云仪的云体探测率最高;(2)以探空气球入云高度为标准,毫米波测云仪云底高度探测相对偏差最小;(3)毫米波测云仪有较强的云顶高探测能力;(4)毫米波测云仪天气适应性最强,在多层云、卷云、低能见度条件下HT101探测性能优于CYY-2B、HY-CL51。  相似文献   

Caledonian high-pressure metamorphism in the Strona-Ceneri Zone (Southern Alps of southern Switzerland and northern Italy)   总被引：3，自引：0，他引：3  

Leander Franz  Rolf L. Romer 《Swiss Journal of Geoscience》2007,100(3):457-467

The Strona-Ceneri Zone comprises a succession of polymetamorphic, pre-Alpidic basement rocks including ortho- and paragneisses, metasedimentary schists, amphibolites, and eclogites. The rock pile represents a Late Proterozoic or Palaeozoic subduction accretion complex that was intruded by Ordovician granitoids. Eclogites, which occur as lenses within the ortho-paragneiss succession and as xenoliths within the granitoids record a subduction related high-pressure event (D1) with peak metamorphic conditions of 710 ± 30 °C at 21.0 ± 2.5 kbar. After isothermal uplift, the eclogites experienced a Barrowtype (D2) tectonometamorphic overprint under amphibolite facies conditions (570-630 °C, 7-9 kbar). U-Pb dating on zircon of the eclogites gives a metamorphic age of 457 ± 5 Ma, and syn-eclogite facies rutile gives a ²⁰⁶Pb/²³⁸U age of 443 ± 19 Ma classifying the subduction as a Caledonian event. These data show that the main tectonometamorphic evolution of the Strona-Ceneri Zone most probably took place in a convergent margin scenario, in which accretion, eclogitization of MOR-basalt, polyphase (D1 and D2) deformation, anatexis and magmatism all occurred during the Ordovician. Caledonian high-pressure metamorphism, subsequent magmatism and Barrow-type metamorphism are believed to be related to subduction and collision within the northern margin of Gondwana. Editorial handling: Edwin Gnos  相似文献   

Deep structure of the Amur lithospheric Plate border zone     

Yu. F. Malyshev  V. Ya. Podgornyi  B. F. Shevchenko  N. P. Romanovskii  V. B. Kaplun  P. Yu. Gornov 《Russian Journal of Pacific Geology》2007,1(2):107-119

Based on the study of the deep Amur Plate border structure, seismogravimetric (density) and geoelectric sections of the plate lithosphere crossing geologically and seismically defined plate boundaries are compiled to construct a three-dimensional model of its lithosphere. The model demonstrates the almost ring structure of the plate with its inner part dipping for 50 km and uplifted fringing. The plate boundary zone consists of orogenic belts (Mongol-Okhotsk, Selenga-Stanovoi, Transbaikal, and Sikhote-Alin) and margins of the Siberian and North China platforms. The plate boundaries are described by mantle diapirism models with a largely bilateral inclined dip of its bordering belts.  相似文献   

High resolution UAV image acquisition method and modeling practice for geological outcrop with a large slope          下载免费PDF全文

Sheng Hui  Duan Zheng-Ming  Liu Shan-Wei  Zeng Zhe  Feng Jian-Wei 《古地理学报》1999,22(4):799-806

The observation on the outcrop in the field is one of the most direct and efficient methods to obtain the underground formation information, which provides the most direct first-hand geological data for geological science research. However, the traditional outcrop investigation, especially for the outcrop with a large slope and unreachable area, mainly relies on the inspection, measurement of the slope bottom, and photos to record outcrop information, making it difficult to accurately characterize the whole geological body. Consumer unmanned aerial vehicle (UAVs) with the advantages of good mobility, strong adaptability and low cost, can obtain outcrop images from a short distance, multiple perspectives and varying heights. In this paper, the image acquisition method and model construction accuracy without control points available for the geological outcrop with a large slope are discussed. Consumer UAVs is used to capture images through vertical route and then the geological model is set up. The results show that oblique photogrammetry technology combined with consumer UAVs can effectively build a large slope geological outcrop model with millimeter resolution. The model has the characteristics of high resolution, uniform resolution and high measurement accuracy up to millimeter, which can effectively reduce the difficulty of field investigation and the personnel safety risk, thus it accurately reproduces the outcrop situation with large slope in the field, providing a real and reliable data basis for the section interpretation, analysis and measurement of large slope outcrop.  相似文献   

煤炭资源洁净等级评价系统设计及应用   总被引：1，自引：0，他引：1  

徐艳杰  杨永国  唐书恒 《煤田地质与勘探》2005,33(3):12-14

采用统计分析方法、层次分析方法和模糊数学方法,对煤炭资源洁净等级评价进行了研究,并基于VisualC++6.0,建立了中国煤炭资源洁净等级评价系统。本文介绍了系统的设计原则、功能模块及其构成,最后以实例验证了该系统是实用和有效的。   相似文献   

面向对象的城市管网数据组织模型设计     

程小凯  李恺毅  李景文  陈大克 《地理空间信息》2010,8(2):127-129,133

针对现有城市管网数据组织方式存在的问题,提出了一种基于面向对象的城市管网数据组织模型,该模型从人们认知的角度,将客观世界中的管网作为集数据和方法于一体的对象综合体,进行一体化存储和管理。模型在引入"类"概念的基础上,对基类中几何类和实体类的结构进行了详细设计,并讨论了模型中类与类、类与对象之间的关系,最后以城市供水管网为例,设计了基于对象的城市供水管网数据组织模型。  相似文献