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���ڸĽ��IJ����ṹ��GML���������о� 总被引:1,自引:0,他引:1
?????????GML??????????????????????????????GML????????????С??????????????????????????????LINQ?????????????????????????????????????????????GML?????????????????????????????????????Ч???????GML????????????? 相似文献
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一种通用GML 3.0解析引擎的设计与实现 总被引:5,自引:0,他引:5
GML提供了一套核心模式和一个基于对象/属性的简单语义模型,使用GML模型及其模式组件,用户可以灵活定义自己的应用模式.然而由于GML建模的这种灵活性,导致不同领域、不同用户定义的应用模式之可能存在较大的差异,从而大大增加了GML数据处理软件的设计难度。如何解析不同用户、不同领域的GML应用模式并理解GML应用模式中元素及类型的语义,就成了基于GML空间数据语义集成共享必须解决的难题。本文首先简单介绍了GML3.0中最常用的3个核心模式、GML应用模式与核心模式的关系及GML模式中元素类型间的约束关系:然后分析了GML 3.0要素的属性组成;提出了通用GML3.0解析引擎中元素语义识别方法;最后,利用JavaBeans技术,在JBuilder X环境下实现了通用GML 3.0解析引擎。 相似文献
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Yoon‐Seop Chang 《International journal of geographical information science》2013,27(4):371-399
Most of the current Internet Geographic Information System (GIS) applications cannot be shared and are not interoperable because of their heterogeneous environments. With the growth of Internet GIS, many difficulties have occurred in integrating GIS components because of their diversity. The main objective of this study is to suggest a new development model for dynamic and interoperable Internet GIS applications. The model is based mainly on the dynamic integration of Internet GIS components by applying Extensible Markup Language (XML), XML Web Service, Geography Markup Language (GML), and Scalable Vector Graphics (SVG), etc. The relevant technologies of Internet GIS were reviewed thoroughly, and then a new model was designed. During the design of the new model, typical examples of GIS Web Service components were suggested, together with practical structures for applications using these components. Six examples of components and four types of applications were suggested, and they were experimentally implemented for model validation and improvement. The suggested model and components will enable easier and more rapid development of Internet GIS applications through the dynamic integration of distributed GIS components. Users will be able to avoid redundancy and consequently reduce both cost and time during each GIS project. 相似文献
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在分析传统的GML,数据压缩技术特点的基础上,提出GMI数据整体同构压缩方法:以GMI,文档中的Fea-ture元素为基元,利用标签索引编码实现语义的同构压缩;以GMI空间数据的聚类分区结果建立分组局部坐标参考系,利用坐标参考系转换实现空间内容的同构压缩.实验证明:该压缩算法的存储空间消耗、查询处理速度等性能均优于传统方法,对研究GMI数据的存储、查询与传输等技术具有一定的参考价值. 相似文献
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��ԭGML�ռ����ݿ�ϵͳ�о���ʵ�� 总被引:1,自引:0,他引:1
GML??XML???????????е???????XML????????洢??????????????????????????GML?????????GML??????????????????????????????????????????????????GML??????????ж??壬?о????GML?????????洢?????????????????????????????????????????????????????????????????????????????????????洢???Ч?????? 相似文献
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GML3.0及其在空间数据共享和互操作中的应用 总被引:1,自引:0,他引:1
对GML3.0的发展和核心技术进行了深入的研究,给出了数据共享和互操作的应用实例,并对未来的GML版本进行了预测。 相似文献
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