空间数据库查询语言的特征

简介了目前空间数据库查询语言研究情况和所具有的形式,按空间数据的特点和查询语言的一般要求,认为空间数据库查询语言应具有以下特征:能理解\     

开源摄影测量实践教学软件设计与实现

针对摄影测量实践教学软件交互能力差、代码封闭等不足,提出了基于开源软件思想及利用交互式数据语言设计开发摄影测量学实践教学软件方法。软件代码公开、操作动作分解、交互能力强,涵盖了摄影测量学主要理论知识、方法和过程,具有结构清晰,教学重点突出,拓展性强的特点。教学实践证明:该软件可以适应不同水平的本科生,具有较好的教学效果。     

一种参数化建筑物三维建模方法

针对传统的建筑物建模方法需要大量人机交互操作,建模过程复杂和成本高的问题,该文提出一种参数化建筑物三维建模方法。首先,以高分辨率遥感影像和建筑物立面影像作为数据源,在遥感和GIS软件平台的支持下,提取建筑物的底面边界、高度、楼层数、层高和屋顶类型等空间数据和属性数据,并将其保存至GIS空间数据库。其次,提出基于拉伸、拆分、添加结构面过程的建筑物主体结构建模方案,并设计了模型自动生成算法。进一步,采用Ruby面向对象语言,通过调用SketchUp平台的应用程序接口函数,结合编程实现了建筑物的自动化建模。最后,开发了建筑物参数化建模插件。实际建模实验成果表明:该方法能够显著降低建模人员劳动强度,提高建模效率。     

Linguistics,geography, and the potential of Australian island toponymies

Australian placename studies have focused on documenting toponymic histories and issues of concern mainly for placename taxonomy and etymology. Language-external factors such as geographical and environmental conditions have not been of great interest to Australian toponymists. This article assesses the role of geographical and environmental constriction of island places on their toponymy. It considers whether or not island locations breed ‘insular toponymies’ or placename histories inaccessible and not readily accessible to outsider researchers. The case studies are Norfolk Island, South Pacific, and Dudley Peninsula, South Australia, two island environments within political Australia. The results demonstrate that the degree of insularity of the toponymies of the two island environments is driven more by geographical and social factors than linguistic elements. The results put forward several ways in which geographers, linguists, historians, toponymists, and Australian studies scholars could work together and collaborate to better understand Australian island places.     

Personalized sightseeing tours: a model for visits in art museums

This article describes a method to provide adapted visit tours in art museums according to the preferences expressed by the visitor and exhibits prestige. It is based on a dual approach with, on the one hand an automatic textual analysis of the official information available online (labels of exhibits) that allows to rank the exhibit attractiveness for a standard museum visitor. On the other hand, individual preferences are also taken into account to adapt the visit according to the personal cultural awareness of the visitor. We use operations research to solve a routing optimization problem, aiming at finding a visit tour with time constraints and maximization of the visitor satisfaction. Depending on the instance size and the problem scale, an integer linear programming (ILP) model and a greedy algorithm are proposed to recommend personalized visit tours and applied on two museums: ‘Musée de l’Orangerie’ in Paris and ‘National Gallery’ in London. The obtained results show that it is possible to recommend a good tour to visitors of an art museum by taking into account the common prestige of the exhibits and the individual interests, joining automatic text summarization and routing optimization in a limited geographical space.     

地理空间意像模式的Voronoi模型

提出用Voronoi空间模型来表达意像模式，Voronoi模型无岐义空间邻近关系，构建能封装对象间空间关系的拓扑网络，使用该模型将各种空间介词映射为不同的拓扑结构，GIS采用该模型，可按自然语言中空间介词描述的定性空间关系查询检索模糊地理信息。     

Fast Web - Based Data Transmission

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基于云计算系统的空间查询处理方法

针对传统的关系型空间数据库已经不能很好地适应于超大规模高并发空间查询访问的处理需要的问题,该文着眼于解决大数据时代下地理信息服务所面临的日益严峻的大规模空间查询访问需求,探索了一套基于Spark架构的空间查询实现技术,并给出相应的解决方案。提出一个基于Spark并提供类SQL访问接口的空间查询实现模型GeoSpark SQL,解决了以下关键问题:数据的外包矩形数据生成和标准地理信息数据对Spark的导入导出方法;Spark空间查询算子实现方法;Spark空间索引与查询优化方法。GeoSpark SQL模型在初步实验中,已可以满足实时性的要求,对复杂的空间查询也能有良好的性能表现。     

基于AutoCAD的城市部件普查数据处理系统研究与应用

介绍了基于C#语言,用AutoCAD的.NET API进行插件开发的相关技术。并以城市部件普查项目为例,阐述了在AutoCAD二次开发中的AutoCAD数据库技术、交互界面技术、数据通信技术、自动成图技术、数据输入输出技术的实现方法。实践表明,用C#进行AutoCAD的二次开发,不仅方法容易掌握,实用性强,还可以根据实际需求,快速实现功能定制,极大地提高了工作效率。     

广东西江流域地名调查工作特点与实例分析

地名调查工作涉及地域划分,地理空间,语言文化,历史文化等方面,运用"3S"技术,结合当地语言文化开展此项工作,能提高调查工作效率和准确度,有利于对存在尚未掌握的地理实体及地名信息的判断、界定和甄别。通过广东郁南县地名调查工作实例,探讨在"3S"技术背景下,根据具有地域性文化特征地区的地名调查工作所呈现的新问题、新特点,可作范例为粤语地区的地名调查提供可操作性建议。