共查询到20条相似文献，搜索用时 140 毫秒
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数字信息化是当今世界经济和社会发展的总趋势,计算机的出现促进了当今数字信息产业的形成,推动了当代科技社会经济的腾飞,使世界进入到“知识经济”社会的新时代。为适应数字信息时代的需要,传统的人工手动、纸质载体地质资料借阅和管理,已远不能满足于现代数字信息化经济社会的发展需求,建立健全的全国统一地质资料目录查询系统,电子数据化借阅管理体系,实现地质资料资源信息共享,充分发挥其地质资料在社会主义建设中的作用。原地质矿产部早在1986年,开始调研论证光盘存储地质资料项目,1996年正式列为地矿部全国地质资料全息数字化工程项… 相似文献
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地质数据本体构建及其在数据检索中的应用 总被引：1，自引：1，他引：0
针对传统以关键词、主题词等字符串匹配为核心的地质数据检索方法存在的查不全、查不准的问题,给出了基于地质数据本体的语义级检索解决方案。通过对地质数据的概念、属性、关系、规则及相应实例的详细表达,构建了地质数据本体(矿产资源预测部分),搭建数据检索系统并开展了应用实践。实验表明,引入地质数据本体后,检索结果在数据的查全率和查准率方面显著提高,并能智能推送相关联的数据信息。开发的地质大数据专题检索系统,实现了对局域网中多源异构地质数据的获取、半自动化标注和语义关联检索,满足地质大数据应用服务的需求,对于大数据时代背景下地质数据的精确发现、深层挖掘及共享有重要意义。 相似文献
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《Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy》1999,24(5):449-454
A new composite map of magnetic surface (MAGSURF) anomaly for Italy and its adjacent region has been derived from sea and ground surveys on the basis of an improved definition of the Italian Magnetic Reference Field and its temporal change. Spectral analysis of the MAGSURF anomaly field shows a regional scale energy in the wavelength range 145–500 km, due to the presence of various crustal sources. The regional MAGSURF anomaly map shows poor correlation with the corresponding MAGSAT scalar anomaly map, whose power spectrum reveals wavelength components in the range 300–700 km. The MAGSURF data are upward-continued to an elevation of 100 km for comparison with MAGSAT satellite data, downward-continued to the same altitude of 100 km and low-pass filtered for wavelengths larger than 500 km. Upward-continued surface data and downward continued satellite data show good morphological similarity for wavelengths in the range 300–500 km at an altitude of 100 km. Satellite data permit the characterization of magnetic signatures due to sources located in the middle-lower crust of Sardinia, Lombardia, Molise and Dalmatia, while further surface regional anomalies are connected with upper crust bodies of Mid Tyrrhene and East Sicily. 相似文献
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深部地球物理探测数据是岩石圈结构研究的重要资料,然而由于地学数据本身的多来源、多学科、海量等特点阻碍了数据的共享,而GIS技术恰好以强大的多学科交叉和空间数据处理功能为数据发布提供了新的途径。在GIS中信息的显示和分析方法都取决于地理信息数据模型,因此在利用GIS技术建立数据共享平台时,建立一个符合数据体查询和分析要求的数据模型尤为重要。笔者对几种空间数据存储方式和主流的空间数据模型进行了深入研究,最终结合深部地球物理探测数据的特点,以Geodatabase为基础建立了一个数据模型,为数据发布奠定了基础。 相似文献
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Tower platforms, with instrumentation at six levels above the surface to a height of 30 m, were used to record various atmospheric
parameters in the surface layer. Sensors for measuring both mean and fluctuating quantities were used, with the majority of
them indigenously built. Soil temperature sensors up to a depth of 30 cm from the surface were among the variables connected
to the mean data logger. A PC-based data acquisition system built at the Centre for Atmospheric Sciences, IISc, was used to
acquire the data from fast response sensors. This paper reports the various components of a typical MONTBLEX tower observatory
and describes the actual experiments carried out in the surface layer at four sites over the monsoon trough region as a part
of the MONTBLEX programme. It also describes and discusses several checks made on randomly selected tower data sets acquired
during the experiment. Checks made include visual inspection of time traces from various sensors, comparative plots of sensors
measuring the same variable, wind and temperature profile plots, calculation of roughness lengths, statistical and stability
parameters, diurnal variation of stability parameters, and plots of probability density and energy spectrum for the different
sensors. Results from these checks are found to be very encouraging and reveal the potential for further detailed analysis
to understand more about surface layer characteristics. 相似文献
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The relationship between the maximum cumulative displacement on a fault (D) and the maximum linear dimension of the fault surface (W) is given by the expression D = cWn, where the value of c is determined by rock properties; proposed values for n range from 1.0 to 2.0. Published datasets of D vs W measurements, together with new data, are presented in a common format. Most datasets are derived from maps and so the measurements of displacement and length do not represent maximum values for each fault. This factor, together with more than an order of magnitude range of c, causes regression on D vs W plots to be unsafe unless the range of W values plotted is ca 5 orders of magnitude. This restriction means that individual datasets must be combined to achieve the required range of fault size. Data analysis shows that the value of n must exceed 1.0 but discrimination between values of 1.5 and 2.0 cannot be made on the basis of data analysis alone. A modified fault growth model in which the increase in dimension of a fault with each slip event is proportional to W0.5 gives rise to a value for n of 1.5. As this model has a sound mechanical basis 1.5 is the preferred value for n. The value of n influences other aspects of fault geometry, including the displacement profile on a fault surface, the spacing of depth contours on faulted horizons and the displacement populations of single fault surfaces. 相似文献
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海陆过渡区是海洋与陆地复合与交叉的地理单元,是资源与环境条件最为优越的地区,将航空重力与地面重力有效融合,形成连续的重力场资料,对海陆过渡区资源与环境评价具有重要意义。本文选择日照—连云港海陆过渡区为示范区,开展了航空重力数据与地面重力数据的融合研究。通过数据整理与对比分析,总结了数据间系统差的确定方法,提出了空地重力数据间一致性与差异性的评估方法,并分别采用剖面和平面两种形式对数据间的一致性和差异性进行了量化评估;在数据量化评估的基础上,采用平面均方根误差法分别对混合法与缝合法的数据拼接质量进行了定量评价,为数据融合方法的选择提供了定量依据。研究结果表明,日照—连云港海陆过渡区航空重力与地面重力数据间剖面上的一致系数为0. 81~0. 99,平面上的一致系数为0. 95,数据间一致性较高,具备较好的数据融合基础;对比试验表明,缝合法对于海陆过渡区空地重力数据融合效果更佳,采用缝合法融合后的重力数据与原始空地重力数据间的均方差分别为2. 63×10 -5 m/s 2 、0. 98×10 -5 m/s 2 ,取得了较好的融合效果。日照—连云港海陆过渡区空地重力数据的融合,为同类地区开展多源重力数据的融合提供了借鉴。 相似文献
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地质资料是地质工作形成的重要成果资料,具有可被重复开发利用、能够长期提供服务的功能。然而,因地质资料的分散式管理,使得地质资料信息存储分散,“孤岛”式服务的现象普遍存在,缺乏资料信息共享、综合利用的机制和手段,制约着地质资料信息潜在价值的有效发挥。地质资料信息服务集群化旨在通过信息领域前沿技术,对地质资料进行集成集群和深度开发,将分散、孤立的地质资料进行分布式汇集,全方位多角度解读、展现、挖掘地质资料信息,充分发挥地质资料服务于经济社会发展的作用。长期的地质调查工作,已经形成了多专业、数据格式多样的海量地质资料,信息服务的集群化必将面临地质大数据相关的技术问题。介绍了地质资料信息服务集群化模式,分析了CitusDB软件的分布式大数据运行机理,探讨了基于CitusDB软件的地质资料集群和大数据服务架构,可为地质大数据与信息服务提供一定的参考。 相似文献
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Transecting the Los Angeles metropolitan area in a general E-W direction are major north-dipping reverse faults comprising the Santa Monica—Raymond Hill fault zone, a segment of the frontal fault system separating the Transverse Ranges from the Peninsular Ranges geomorphic provinces of southern California. Pleistocene or Holocene movement is evident along some segments of these faults, but urban development precludes accurate location and assessment of Quaternary movement by conventional mapping techniques. At present no conclusive evidence of Holocene surface rupture has been found onshore west of the Raymond Hill segment of the fault zone, but the geologic conditions and urban development in the area are such that the possibility of Holocene movement cannot be excluded at this time. Groundwater barriers in Pleistocene sediments are indicative of Quaternary faulting on the Santa Monica fault segment west of the Newport—Inglewood fault zone. Most literature indicates that movement along the Beverly Hills—Hollywood segment east of the Newport—Inglewood fault zone terminated in Late Miocene or Pliocene time, and there is no general agreement on the location of faults in this segment. However, recent work by the Division of Mines and Geology, by Geotechnical Consultants, Inc., and others suggests that the Santa Monica fault transecting the Hollywood area is associated with a zone of differential subsidence that varies from 100 to 400 m wide, depending on the resolution of repeated leveling survey data and with a groundwater barrier determined from analysis of oil-well and water-well data. Additional exploration is essential to test our present geologic model and to evaluate the earthquake hazard and seismic risk of faults in the area. 相似文献
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A. M. Mickaelian 《Astronomy Reports》2016,60(9):857-877
Two major characteristics of modern astronomy are multiwavelength (MW) studies (fromγ-ray to radio) and big data (data acquisition, storage and analysis). Present astronomical databases and archives contain billions of objects observed at various wavelengths, both galactic and extragalactic, and the vast amount of data on them allows new studies and discoveries. Astronomers deal with big numbers. Surveys are the main source for discovery of astronomical objects and accumulation of observational data for further analysis, interpretation, and achieving scientific results. We review the main characteristics of astronomical surveys, compare photographic and digital eras of astronomical studies (including the development of wide-field observations), describe the present state of MW surveys, and discuss the Big Data in astronomy and related topics of Virtual Observatories and Computational Astrophysics. The review includes many numbers and data that can be compared to have a possibly overall understanding on the Universe, cosmic numbers and their relationship to modern computational facilities. 相似文献
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