共查询到20条相似文献，搜索用时 390 毫秒
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Markus Innerebner Armin Costa Ekaterina Chuprikova Roberto Monsorno Bartolomeo Ventura 《Earth Science Informatics》2017,10(1):55-68
Scientists as well public institutions dealing with geospatial data often work with a large amount of heterogeneous data deriving from different sources. Without a well-defined, organized structure they face problems in finding and reusing existing data, and as consequence this may cause data inconsistency and storage problems. A catalog system based on the metadata of spatial data facilitates the management of large amount of data and offers service to retrieve, discover and exchange geographic data in an quick and easy fashion. Currently, most online catalogs are more focusing on the geographic data and there has been only few interests in catalogizing Earth observation data, in which in addition the acquisition information matters. This article presents an automatic metadata extraction approach that creates from different optical data deriving from various satellite missions of scientific interest (i.e. MODIS, LANDSAT, RapidEye, Suomi-NPP VIIRS, Sentinel-1A, Sentinel-2A) metadata information, based on an extended model of the standard ISO 19115. The XML schema ISO 19139-2 with the support of gridded and imagery information defined in ISO 19115-2 was examined, and based on the requirements of experts working in the research field of Earth observation the schema was extended. The XML schema ISO 19139-2 and its extension has been deployed as a new schema plugin in the spatial catalog Geonetwork Open Source in order to store all relevant metadata information about satellite data and the appropriate acquisition and processing information in an online catalog. A real-world scenario that is productively used in the EURAC research group institute for Applied Remote Sensing illustrates a workflow management for Earth observation data including data processing, metadata extraction, generation and distribution. 相似文献
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MapGIS数据向ArcGIS数据格式转换方法的实践与探讨 总被引：1，自引：0，他引：1
由于在地图编辑和数据分析方面各具优势,MapGIS和ArcGIS逐渐发展成为目前国内被广泛使用的地理信息系统平台,实现二者间数据安全转换将有利于对两种系统功能的充分利用,大大提高空间数据库的生产效率和使用率。在分析比较两种系统空间建模思想及专有数据格式的基础上,提出了将空间数据从MapGIS平台转换到ArcGIS平台上的基本思路,并通过工作实例进行了数据转换验证,对过程中存在的问题进行了总结,形成了一套较为成熟的技术方法。 相似文献
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Universal cokriging is used to obtain predictions when dealing with multivariate random functions. An important type of nonstationarity is defined in terms of multivariate random functions with increments which are stationary of orderk. The covariance between increments of different variables is modeled by means of the pseudo-cross-covariance function. Criteria are formulated to which the parameters of pseudo-cross-covariance functions must comply so as to ensure positive-definiteness. Cokriging equations and the induced cokriging equations are given. The study is illustrated by an example from soil science. 相似文献
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Compositional data analysis 总被引：1，自引：0，他引：1
Richard A. Reyment 《地学学报》1989,1(1):29-34
Compositional data occur naturally in the geosciences — tables of chemical analyses, rock-compositions, sedimentary proportions, pollen-analytical tables, etc. The statistical analysis of such data requires special techniques and it is not possible to use standard methods of computing correlation coefficients and carry out multivariate statistical analyses without the risk of incurring grave mistakes. The special property of compositional data, to wit, the fact that the determinations on each specimen sum to a constant, means that the variables involved in the study occur in constrained space defined by the simplex , a restricted part of real space. 相似文献
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Universal cokriging is used to obtain predictions when dealing with multivariate random functions. An important type of nonstationarity is defined in terms of multivariate random functions with increments which are stationary of orderk. The covariance between increments of different variables is modeled by means of the pseudo-cross-covariance function. Criteria are formulated to which the parameters of pseudo-cross-covariance functions must comply so as to ensure positive-definiteness. Cokriging equations and the induced cokriging equations are given. The study is illustrated by an example from soil science. 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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《Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy》2000,25(8):635-638
This paper describes the DUST-2 (Data Utilization software Tools) software, which is a possibility in visualizing and processing ozone and water vapor data of the Earth atmosphere as measured by satellite instruments (TOMS, GOME, MAS) and provided by different data centers. In addition, a new search tool (S4 tool) which allows to search for comparable ozone and water vapor data in four dimensions (location and time) within the DUST-2 data base and a hdf2csv conversion tool are represented. The software package as well as complementary information and data examples are published on CD-ROM (“Data Utilization Software Tools — 2”, DUST-2, Hartmann et al. 2000) under ISBN 3-9804862-3-0 which is available via www.copernicus.org. 相似文献
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为理解地下水位观测信息在非饱和水流数据同化中的数据价值,建立了基于地下水位动态观测信息的一维饱和-非饱和水流集合卡尔曼滤波,通过虚拟数值实验检验了地下水位观测信息在非饱和水力参数估计和水分校正中的潜在价值。研究结果表明:在以地下水位为唯一观测数据时,同时更新参数和水头比仅更新水头能更好地校正土壤剖面的水头分布;当多层单个水力参数未知时,地下水位观测可以为参数估计提供有效信息;当多层多个参数未知时,地下水位与多层多个参数之间的复杂关系导致观测信息难以估计出最优的(唯一的)参数值;地下水位可作为辅助信息,与含水量观测等信息联合运用改善参数估计和含水量预测精度。 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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数据预处理技术在地学大数据中应用 总被引：3，自引：2，他引：1
大数据时代随着数据的爆发式增长,在带来可供研究的海量数据的同时,也带来巨量的噪声和冗余数据。在地学领域,由于研究方向和技术方法手段的多样化,产生了数据量巨大和类型众多的地学数据集合。在地学信息的研究过程中,经常碰到地学信息孤岛,分图幅地学数据边界系统误差和地学文档的非结构化问题。在对地学数据进行信息的提取和挖掘之前,必须根据研究目的对地学大数据进行预处理,使冗余、复杂的大数据转为结构化、准确、可用的数据。本文以地学大数据的预处理技术为切入点,从地学数据交互标准与语义、数据调平、地质图接边和文本结构化等四个研究方面,分析阐述目前地学大数据挖掘方面存在的问题及主要的解决手段,同时也对多元数据融合在大数据中的应用进行了阐述。希望通过本文对地学大数据预处理技术的探讨,能对地学大数据的挖掘有所帮助。 相似文献
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