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- multilevel and heterogeneous spatial Databases 多级异构空间数据库
- heterogeneous spatial database 异构空间数据库
- Since distributed spatial database will be the main data source of Internet GIS, we have to cope with the intercommunication between heterogeneous databases and systems. 摘要随着空间数据获取能力的飞速发展，分布式存储管理的空间数据库将成为网络GIS的主要数据源。
- Selectivity Estimation is the base of spatial database query optimizer. 选择性估计是设计空间数据库查询优化器的基础。
- Jing Ning, born in 1963.Professor and Ph.D. Supervisor.His main research interests include GIS and spatial database. 景宁,1963年生,教授,博士生导师,主要研究方向为地理信息系统、空间数据库。
- Spatial database for railway is the foundation of Railway Geographic Information System (RGIS). 摘要铁路空间数据库是铁路地理信息系统(RGIS)的基础。
- It can handle spatial data and spot any-shape clusters in a noised spatial database by dividing them into clusters with high enough density. 该算法将具有足够高密度的区域划分为簇,并可以在带有“噪声”的空间数据库中发现任意形状的聚类。
- SDM is different from the classical data mining in that spatial database have its own characters compared with relational database (RDB). 空间数据有许多不同于非空间数据的特性，使得空间数据挖掘与一般数据挖掘相比亦有其鲜明的特征。
- This paper classify a series of methods on spatial database index, and introduce the QR-tree index structure with very large spatial database. 在综述现有空间数据库索引技术的基础上，提出了一种面向大型空间数据库的QR-树索引方法。
- The data storage is based on RDS, design spatial database under the direction of object oriented concept and realize object storage. 数据的存储是以现有的关系数据库为基础,以面向对象的思想为指导来设计空间数据库,实现对象的存储。
- multi-source heterogeneous spatial data 多源异构空间数据
- However there are some problem in the content and system of spatial database course and the standard teaching mode has not been formed. 但由于种种原因，空间数据库课程在课程体系、课程内容、教学模式等方面仍然存在许多问题和不足。
- heterogeneous spatial information sharing 异构空间信息共享
- ArcGIS extends ArcView by providing multi-userediting, advanced analysis, Internet services, and highperformance spatial database services. 在 ArcView 中，无论用view，table，chart，layout或script哪一种方式来对数据进行检索、查询、统计分析或生成图，都是通过对专题(theme)，特征(feature，又作要素)，属性(attribute)，字段(field)进行操作来实现。
- With the penetration of geographical information system in people's lives,NL-oriented spatial database query has been noticed. 随着地理信息系统深入应用于人们的日常生活,面向自然语言的空间数据库查询的研究越来越被人们重视。
- To query the spatial database effectively, this paper constructs a new spatial index structure (MC tree) and also presents the properties and updating-arithmetics of the MC tree . 根据空间数据库的查询要求,本文构建了一种新的空间索引结构(MC树),并给出了MC树的性质和相关更新算法。
- Mining spatial association rules can be used to discover the specific spatial relationship between spatial predicate and non-spatial predicate in the spatial database. 空间关联规则挖掘可应用于发现空间数据库中大量空间谓词与非空间谓词之间的特定空间关系。
- The evaluation section of the spatial database consisted of the overlayed patches the current land use map and the basic farmland protection map and the soil map. 耕地地力评价单元通过叠加土地利用现状图、基本农田保护区规划图和土壤图所形成的图斑组成。
- The establishment of the spatial database of resource and environment information system in Songnen Basin makes the inquiry and use of relative information more convenient. 文章介绍了松嫩盆地资源环境信息系统空间数据库的设计思路、总体目标、构成及功能以及系统建立的关键技术。
- STUDY OF DISTRIBUTED HETEROGENEOUS SPATIAL DATA SHARING 分布式异构空间数据共享研究
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
