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在武汉市的综合地下管线建库工作中,数据组织是最为核心和关键的工作。我们结合实际情况,基于空间数据引擎制定了特有的、兼容性强的数据结构,并针对数据的特性进行了分层管理,建立了数据安全保障机制,充分发挥空间数据中间件ArcSDE的高性能,为数据库的安全、高效运行提供了坚实的保障。 相似文献
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本文就目前空间数据集成的两种主流模式,在论证了各模式的优缺点的基础上,得出了用GML作为地理空间数据转换及传输的标准是切实可行、具有应用前景的方案。从而提出了基于GML的多源异构空间数据集成的模型,并探讨了基于这一模型实现空间数据共享的若干问题。 相似文献
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The advanced data mining technologies and the large quantities of remotely sensed Imagery provide a data mining opportunity with high potential for useful results. Extracting interesting patterns and rules from data sets composed of images and associated ground data can be of importance in object identification, community planning, resource discovery and other areas. In this paper, a data field is presented to express the observed spatial objects and conduct behavior mining on them. First, most of the important aspects are discussed on behavior mining and its implications for the future of data mining. Furthermore, an ideal framework of the behavior mining system is proposed in the network environment. Second, the model of behavior mining is given on the observed spatial objects, including the objects described by the first feature data field and the main feature data field by means of the potential function. Finally, a case study about object identification in public is given and analyzed. The experimental results show that the new model is feasible in behavior mining. 相似文献
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The advanced data mining technologies and the large quantities of remotely sensed Imagery provide a data mining opportunity
with high potential for useful results. Extracting interesting patterns and rules from data sets composed of images and associated
ground data can be of importance in object identification, community planning, resource discovery and other areas. In this
paper, a data field is presented to express the observed spatial objects and conduct behavior mining on them. First, most
of the important aspects are discussed on behavior mining and its implications for the future of data mining. Furthermore,
an ideal framework of the behavior mining system is proposed in the network environment. Second, the model of behavior mining
is given on the observed spatial objects, including the objects described by the first feature data field and the main feature
data field by means of the potential function. Finally, a case study about object identification in public is given and analyzed.
The experimental results show that the new model is feasible in behavior mining.
Supported by the National 973 Program of China(No.2006CB701305,No.2007CB310804), the National Natural Science Fundation of
China (No.60743001), the Best National Thesis Fundation (No.2005047), the National New Century Excellent Talent Fundation
(No.NCET-06-0618). 相似文献
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ABSTRACT Eighty percent of big data are associated with spatial information, and thus are Big Spatial Data (BSD). BSD provides new and great opportunities to rework problems in urban and environmental sustainability with advanced BSD analytics. To fully leverage the advantages of BSD, it is integrated with conventional data (e.g. remote sensing images) and improved methods are developed. This paper introduces four case studies: (1) Detection of polycentric urban structures; (2) Evaluation of urban vibrancy; (3) Estimation of population exposure to PM2.5; and (4) Urban land-use classification via deep learning. The results provide evidence that integrated methods can harness the advantages of both traditional data and BSD. Meanwhile, they can also improve the effectiveness of big data itself. Finally, this study makes three key recommendations for the development of BSD with regards to data fusion, data and predicting analytics, and theoretical modeling. 相似文献
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This paper describes a procedure for extending local statistics to categorical spatial data. The approach is based on the notion that there are two fundamental characteristics of categorical spatial data; composition and configuration. Further, it is argued that, when considered locally, the latter should be measured conditionally with respect to the former. These ideas are developed for binary, gridded data. Local composition is measured by counting the numbers of cells of a particular type, while local configuration is measured by join counts. The approach is illustrated using a small, empirical data set and an ad hoc procedure is developed to deal with the impact of global spatial autocorrelation on the local statistics.The author gratefully acknowledges financial support from the GEOIDE Network of Centres of Excellence (ENV #4) and the helpful comments of three anonymous reviewers. 相似文献
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空间数据仓库元数据的认知过程 总被引:1,自引:1,他引:0
空间数据仓库的认知过程主要就是十一个层次的世界通过十个算子转换的过程,如何将某两个世界进行转换,上述十个算子起着至关重要的作用。实际上,这些转换算子主要是依靠元数据来实现的,要实现两个世界的转换,通晓这两个世界的元数据是转换的前提。因此,这十一个层次的世界模型及转换算子就可构成空间数据仓库元数据的认知过程理论。 相似文献
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GIS空间数据转换为DXF格式的方法研究 总被引:2,自引:0,他引:2
GIS空间数据具有多源性的特征,为数据综合利用和数据共享带来不便,解决多格式数据源集成一直是近年来GIS应用系统开发中需要解决的重要问题[5]。DXF格式作为一种空间数据转换的事实上的标准,对于GIS软件来说,实现两者的数据转换具有重要意义。本文分析了GIS空间数据与AutoCAD数据模型的组织特征,在比较分析的基础上设计了转换方案,并就实现过程中的关键技术进行了论述。 相似文献
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An Improved Hilbert Curve for Parallel Spatial Data Partitioning 总被引:1,自引:0,他引:1
MENG Lingkui HUANG Changqing ZHAO Chunyu LIN Zhiyong 《地球空间信息科学学报》2007,10(4):282-286
A novel Hilbert-curve is introduced for parallel spatial data partitioning, with consideration of the huge-amount property of spatial information and the variable-length characteristic of vector data i... 相似文献
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Identifying local spatial association in flow data 总被引:5,自引:1,他引:4
In this paper we develop a spatial association statistic for flow data by generalizing the statistic of Getis-Ord, G
i (and G
i
*). This local measure of spatial association, G
ij, is associated with each origin-destination pair. We define spatial weight matrices with different metrics in flow space.
These spatial weight matrices focus on different aspects of local spatial association. We also define measures which control
for generation or attraction nonstationarity. The measures are implemented to examine the spatial association of residuals
from two different models. Using the permutation approach, significance bounds are computed for each statistic. In contrast
to the G
i statistic, the normal approximation is often appropriate, but the statistics are still correlated. Small sample properties
are also briefly discussed.
Received: 18 February 1998/Accepted: 29 September 1998 相似文献
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可视化交互空间数据挖掘技术的探讨 总被引:12,自引:2,他引:10
随着地理信息获取技术飞速发展,使得当前存储在空间数据库中的空间数据的深度和广度得到了前所未有的发展,传统的空间统计方法和空间分析方法已经难以有效而迅速地处理和分析它们,如何有效而及时地分析和处理空间数据变得越来越迫切。空间数据挖掘作为上个世纪90年代逐步发展起来的新兴技术,逐渐在研究和实践中显示出它的优势。与此同时,地理可视化技术也逐步走向成熟,二者的结合催生出新型空间数据分析技术———可视化交互空间数据挖掘。本文就该技术的相关问题进行了一些研究探讨。 相似文献
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空间数据模糊聚类的有效性(英文) 总被引:1,自引:0,他引:1
The validity measurement of fuzzy clustering is a key problem. If clustering is formed, it needs a kind of machine to verify its validity. To make mining more accountable, comprehensible and with a usable spatial pattern, it is necessary to first detect whether the data set has a clustered structure or not before clustering. This paper discusses a detection method for clustered patterns and a fuzzy clustering algorithm, and studies the validity function of the result produced by fuzzy clustering based on two aspects, which reflect the uncertainty of classification during fuzzy partition and spatial location features of spatial data, and proposes a new validity function of fuzzy clustering for spatial data. The experimental result indicates that the new validity function can accurately measure the validity of the results of fuzzy clustering. Especially, for the result of fuzzy clustering of spatial data, it is robust and its classification result is better when compared to other indices. 相似文献
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本文提出一种基于"规则"的空间数据组织模式。要素规则从几何和属性两个方面控制空间数据的质量和逻辑;拓扑规则将地理要素与要素之间的拓扑关系独立出来,增加了空间数据使用的灵活性;应用规则主要针对用户访问空间数据时的透明度和安全性等问题。 相似文献