校园地理信息系统的设计与实现

随着信息化技术和高校信息化建设的迅速发展,在现代高校规划和管理建设中,建立数字化校园地理信息系统已成为一种趋势。本文以山东科技大学校园地理信息系统为例,基于校园信息服务的基本需求,并结合Arcgis Engine进行GIS二次开发,设计了集成化的校园地理信息系统,实现校园浏览和查询以及空间分析等功能,给学校师生提供便捷、优质、实时的校园信息服务,加快了学校数字化建设的进程,提高了学校对外宣传的影响力。     

城市公共交通GIS查询系统设计与开发

针对城市道路建设和交通基础设施建设以及传统公交查询技术对公交数据管理存在数据冗余的问题,该文提出了基于动态分段技术和采用空间数据库引擎来组织和管理公交数据的方法。以兰州市城市公共交通为研究对象,并结合ArcGIS Engine组件库,设计并开发符合大众使用习惯的城市公共交通GIS查询系统。实验结果表明:该系统不仅可以规划合理的可视化出行路线来满足乘客需要,而且有效减少了公交数据的冗余度。     

基于文本的地理空间数据挖掘与可视化

W eb文本挖掘在现今各行业中越来越受欢迎,而基于文本的地理空间数据的挖掘与可视化还是一个较新颖的研究领域。本文在综述文本数据挖掘研究现状的基础上,提出了基于传统文本的地理空间数据挖掘应用模型,利用Arcview作为构建模型的基础平台,实现了基于文本的地理信息的可视化和历史景点相关属性信息的查询。试验模型系统具有历史地物景点的分类、统计与显示查询等功能,并可以与现代景点进行对比分析。论文最后对此模型的不足作出分析,进而提出改进建议。     

扩展SPARQL的室内空间语义查询研究

针对室内空间特点以及人类对室内位置服务的迫切需求,探讨了适合室内空间语义查询的方法。基于全息位置地图室内空间本体模型,描述室内空间对象及与之相关的人、事的属性信息及其关系,以室内空间本体概念及其属性作为查询原语,增加查询函数实现室内特有的空间关系（如“对面”、“楼上”和“楼下”等）的计算与查询,扩展了SPARQL查询语言基本语法。设计了室内本体查询语言IndoorSPARQL,开发自定义查询语言解析器,初步实现了顾及空间计算的室内空间语义查询。最后,利用Protégé本体建模工具对试验区进行本体实例建模,采用自定义查询语言IndoorSPARQL进行室内语义查询,并将结果可视化。实验结果表明,基于自定义语言IndoorSPARQL的查询方法可有效地支持顾及室内空间计算的复杂语义查询。     

基于ArcGIS的国家台网地震速报地名查询辅助系统设计与实现

基于国家台网地震速报的实际工作需求,针对国家台网在全球地震速报中缺乏专门的地名查询系统,通过对国家台网实时、人机交互处理子系统和全国速报信息交换平台(EQIM系统)的相关协议和数据接口进行研究,并结合地震速报相关规定中对地名的要求,基于地理信息系统Arc GIS提供的Arc GIS Engine(AE)组件技术,采用Visual.Net开发平台和COM组件技术,来实现获取地震地名信息的功能,开发设计一套用于国家台网地震速报的地名查询辅助系统,希望可以有效提高国家台网地震速报的效率和准确度。     

求解制图区域的地图图幅编号的算法研究

基于地理格网理论,从点、线、面三个方面,提出了归原法、斜率分段-同异侧判别法和投影反算-图廓内外判别法,这些算法可准确映射各种投影后制图区域所对应的基础地理信息数据范围,实现了制图范围内地理信息数据所属地图图幅编号的可视化查询。     

MODIS影像的局地云量信息元数据提取算法与应用

云对于光学遥感影像质量及其反演地表参数精度有着重要影响,且其作为时空多变要素之一,在一定程度上制约了光学遥感影像的应用。对于具有2 330km的大扫描幅宽MODIS影像而言,现有的元数据标准仅能反映影像的总体云量,而无法反映云的空间分布状况,限制了MODIS数据的局地研究和应用。本文在现有遥感影像元数据标准的基础上,提出了新的元数据项--局地云量,用于反映云在条带影像中的空间分布状况,并实现在MODIS二级云掩膜条带产品(MOD35)中针对特定区域的局地云量信息提取算法。经验证,本算法能较快速和准确地提取省级行政区的局地云量信息,并可根据用户的需求进一步推广到任意指定的多边形区域,为MODIS数据在局地研究和应用提供了便利。     

GIS and remote sensing integration for environmental applications

Abstract

The combined use of remotely-sensed images and vector GIS data has received considerable interest in recent years. This review article discusses the historical move towards closer integration of remote sensing and GIS technologies and the requirements of integrated software systems to enable remotely-sensed data to be combined with vector datasets for maximum effect. The benefits of integration to users of both GIS and remote sensing for environmental applications are reviewed and some thoughts are given on terminology and future directions in this field.     

Modeling uncertainty of moving objects on road networks via space–time prisms

Moving objects produce trajectories, which are typically observed in a finite sample of time‐stamped locations. Between sample points, we are uncertain about the moving objects's location. When we assume extra information about an object, for instance, a (possibly location‐dependent) speed limit, we can use space–time prisms to model the uncertainty of an object's location.

Until now, space–time prisms have been studied for unconstrained movement in the 2D plane. In this paper, we study space–time prisms for objects that are constrained to travel on a road network. Movement on a road network can be viewed as essentially one‐dimensional. We describe the geometry of a space–time prism on a road network and give an algorithm to compute and visualize space–time prisms. For experiments and illustration, we have implemented this algorithm in MATHEMATICA.

Furthermore, we study the alibi query, which asks whether two moving objects could have possibly met or not. This comes down to deciding if the chains of space–time prisms produced by these moving objects intersect. We give an efficient algorithm to answer the alibi query for moving objects on a road network. This algorithm also determines where and when two moving objects may have met.     

GQL: Extending Xquery to query GML documents

GML is becoming the de facto standard for electronic data exchange among the applications of Web and distributed geographic information systems. However, the conventional query languages (e.g. SQL and its extended versions) are not suitable for direct querying and updating of GML documents. Even the effective approaches working well with XML could not guarantee good results when applied to GML documents. Although XQuery is a powerful standard query language for XML, it is not proposed for queryings spatial features, which constitute the most important components in GML documents. We proposes GQL, a query language specification to support spatial queries over GML documents by extending XQuery. The data model, algebra, and formal semantics as well as various spatial functions and operations of GQL are presented in detail.