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基于ArcSDE的地理数据入库技术研究 总被引:1,自引:0,他引:1
分析了GIS开发中空间数据的导入原理和技术,提出了一种基于ArcSDE的自建命令,实现了一种简单高效的空间数据入库方法。 相似文献
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按照目前的专业制图规范对地图表达的质量要求,计算机制图原理和技术无法避免制图过程中需要大量人工处理地图要素图形冲突的工作。这种由于数据模型间(数字地理景观模型与数字制图模型间)的差别而产生的技术难题一直是实现快速制图的瓶颈。本文基于"先处理、后符号化"的策略,通过分析引起图形冲突的形式以及地图制图规范对冲突处理的要求,提出了针对图形重叠和图形衔接两类图形冲突处理的基本操作,即将对地图要素(地理要素符号化)的图形处理转变为对地理要素本身的处理,从而减少了后期图形冲突处理的工作量;基于这些基本操作,以地形图制图中产生大量冲突处理的道路、水系和境界要素类型为例,说明如何综合利用这些基本操作,实现对图面冲突自动处理的方法;最后,两幅实际地形图数据试验表明本操作可以提高制图效率。 相似文献
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AbstractWith the rapid development of 3D Digital City, the focus of research has shifted from 3D city modeling and geo-database construction to 3D geo-database service and maintenance. The frequent modifications on geometry, texture, attribute, and topology present a great challenge to the 3D geo-database updating. This article proposes an event-driven spatiotemporal database model (ESDM) that combines the historical and present 3D city models with the semantic classification and state expression, triggered by changing events predefined. In addition, a corresponding dynamic updating method based on adaptive matching algorithm is presented to perform the dynamic updating operation for the complex 3D city models automatically, according to the compound matching of semantics, attributes, and spatial locations. Finally, the validity and feasibility of the proposed ESDM and its updating method are demonstrated through a 3D geo-database with more than 1.5 million 3D city models. 相似文献
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