| 嵌入式GIS的数据模型构造方法 |
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| 引用本文： | 裴凌,王庆,王慧青.嵌入式GIS的数据模型构造方法[J].东南大学学报(自然科学版),2005,35(3):480-483. |
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| 作者姓名： | 裴凌 王庆 王慧青 |
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| 作者单位： | 东南大学仪器科学与工程系,南京,210096;东南大学仪器科学与工程系,南京,210096;东南大学仪器科学与工程系,南京,210096 |
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| 基金项目： | 国土资源部“十五”重点科技资助项目(200210102) |
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| 摘 要： | 分析了桌面GIS数据模型和嵌入式系统的特点，针对嵌入式GIS底图构建了混合式数据模型，空间数据与属性数据之间的联系通过惟一标识号建立，设计了非拓扑的分层分级分格的数据结构．根据底图要素类型的不同分层、地物外接矩形的大小分级及每一级底图坐标，将底图均分为若干个网格，每次显示其中的4个网格．对野外采集的嵌入式GIS空间数据，构建了面向对象的数据模型．实际工程应用表明，GIS运行速度显著提高，解决了嵌入式系统内存不足的问题．
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| 关 键 词： | 嵌入式系统 GIS 数据模型 面向对象 |
| 文章编号： | 1001-0505(2005)03-0480-04 |
Design method of embedded GIS data model |
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| Pei ling,Wang Qing,Wang huiqing.Design method of embedded GIS data model[J].Journal of Southeast University(Natural Science Edition),2005,35(3):480-483. |
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| Authors: | Pei ling Wang Qing Wang huiqing |
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| Abstract: | The desktop geographic information system (GIS) data model and embedded system characters are analyzed. A composite data model for base map is constructed. The relationship between spatial data and attribution is built by the feature identification code. And a layer-level-grid data structure based on non-topology is designed. The base map is separated into different layers by the feature code and different levels by the area of planimetric feature. Each level is divided into several average size grids by the coordinate. An object-oriented geographic data model (OOGDM) for new spatial data from surveying in the field is designed. Application results show that the GIS runs at higher speed and the problem of memory shortage in embedded system is solved. |
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| Keywords: | embedded system geographic information system (GIS) data model object-oriented |
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