Geo-rough Space

Rough set is a new approach to uncertainties in spatial analysis.in this paper,rough set symbols are simplified and standardized in terms of rough interpretation and specialized indication.Rough spatial entities and their topological relationships are also proposed in rough space,thus a universal intersected equation is developed,and rough membership function is further extended with the gray scale in our case study.We complete three works.First,a set of simplified rough symbols is advanced on the basis of existing rough symbols.Second.Rough spatial entity is put forwark to study the real world as it is ,without forcing uncertainties into crisp set.Third,rough spatial topological relationships are studied by using rough matrix and their figures.The relationships are divided into three types,crisp entity and crisp entity(CC),rough entity and crisp entity (RC),and rough entity and rough entity (RR),A universal intersected equation is further proposed.Finally,the maximum and minimum maps of river thematic classification are genrated via rough memebership function and rough relationships in our case study.     

地理信息数据质量的概念、评价和表述——地理信息数据质量控制国家标准核心内容浅析

介绍已经报批的国家标准《地理信息质量原则》和《地理信息质量评价过程》所确定的地理信息数据质量元素、子元素及其描述符,数据质量评价的方法、内容和要求,以及数据质量评价结果的表达方法,并就我国这一领域存在的问题和相关标准及今后的发展简单地进行了分析。     

我国地理信息产业现状分析

本文在对我国地理信息产业规模、主体、技术、人才等方面进行调查的基础上,分析了我国地理信息产业发展的总体现状,研究了我国地理信息产业发展的主要动力和发展方向,从基础地理信息资源、地理信息产权、市场机制、安全保密等方面指出了我国地理信息产业发展亟待解决的几个问题。     

基于语义模型的地图符号库设计研究

通过深入分析地图符号的语义扩展和解析地图符号的语言学实体特征,结合地图符号的数学定义,借助转换生成语法规则提出了基于语义的形式化地图符号模型。基于该模型的相关思想方法和面向对象的Visual C^＋＋．NET编程语言设计并开发了地图符号制作工具。     

Structural Alignment Methods with Applications to Geospatial Ontologies

We consider the problem of enabling interoperability and information sharing among geospatial applications that use ontologies to describe their concepts and the relationships among them. We present two fully automatic alignment methods that use the graph structures of a pair of ontologies to establish their alignment, that is, the semantic correspondences between their concepts. We have tested our methods on geospatial ontologies pertaining to wetlands and four other pairs that belong to a repository that has been used in the Ontology Alignment Evaluation Initiative (OAEI). Using these ontologies, we have compared the effectiveness (precision and recall) of our methods against the Similarity Flooding Algorithm that was proposed by others and show that for each of the tested ontologies one of our methods is at least as effective as their method. We have tuned the performance of our methods by introducing a greedy approach that reduces the number of concepts that get compared. This approach reduces runtime by approximately 30% with a minor compromise to the effectiveness of the results. To further validate our approach, we participated in the OAEI competition to align a pair of ontologies, each with a few thousand concepts.     

Spatial distribution and geomorphology of lunette dunes on the High Plains of Western Kansas: implications for geoarchaeological and paleoenvironmental research

The High Plains are a vast, low relief landscape that contains thousands of upland-embedded depressional playa wetlands. Lunettes are isolated dunes that form from prolonged periods of aeolian deposition along the downwind margin of some larger playas. Playa-lunette systems are important landscape elements that have the potential to preserve high-resolution records of past environments, and several archeological sites have been associated with playa-lunette systems throughout the High Plains. While a comprehensive playa wetland geospatial database has been developed for the High Plains, lunettes have only been mapped for the Southern High Plains of Texas and New Mexico. The purpose of this research was to map and characterize the geomorphology of all lunettes associated with playas in the High Plains and bordering regions of western Kansas. Results indicate 129 lunettes are associated with 104 playas in Kansas. All lunettes are associated with playas larger than 5 ha, and about 10% of these larger playas have a lunette. Lunette height ranges from approximately 1.5–12 m, with a median height of 3 m. Most lunettes (60%) are in Finney, Gray, Lane, and Scott counties, which have broad, flat uplands with few major drainages upwind of playas and lunettes.     

面向地理空间数据更新的数据同化

针对目前地理空间数据整合与持续高效更新存在的问题,将数据同化这一概念和思想引入地理空间数据的更新,目的是提高空间数据质量和空间数据库更新的效率。着重论述了地理空间数据同化的概念、内涵和关键技术。最后提出了地理事件-条件-操作GECA(Geographical Event-Condition-Action)规则驱动下的基于数据同化的地理空间数据更新机制。     

大范围地理空间信息点对点坐标转换设计与实现

介绍了大范围地理空间信息点对点坐标转换的思路,重点论述了该技术的关键,即在充分记录多点定位图形的原始构成信息后,将其分解为离散点,以点方式进行坐标转换,最后根据图形的原始信息来恢复图形。     

海量矢量地图数据网络发布的引擎开发与应用实践

聚焦“地理信息公共服务平台”建设中大数据量矢量图层数据管理与发布的问题,介绍了一种在网络上快速发布大数据量（具体指“图层数多、单个图层数据量大”）矢量图层数据的新方法及其应用实践,详细描述了“海量矢量地图数据网络发布引擎”的开发背景、所解决的问题、实现原理以及应用实效等内容。