This paper addresses how open geodata and crowd-sourced geodata, and the open geoportals might be integrated with the mainstream surveying and mapping practices to update traditional topomaps quickly and inexpensively...This paper addresses how open geodata and crowd-sourced geodata, and the open geoportals might be integrated with the mainstream surveying and mapping practices to update traditional topomaps quickly and inexpensively, that might be otherwise impossible to do it due to economic and logistic situations. The abundant geographic data on the internet could be used to update topographic maps while avoiding the time-consuming nature of the traditional method. To be able to use them, it is necessary to measure and quantify the quality of these data, as well as to verify their credibility, in order to incorporate them into official topographic maps. The proposed approach takes advantage of neocartography, and it’s not about further developing a new approaches, but looking differently at how data is collected, assembled controlled and been used for updating topomaps. At the beginning, the methodology used about how open geodata and crowd-sourced geodata involved in collecting, simplifying, generalizing, controlling and generating useful cartographic information that complement traditional and conventional counterparts is presented. This methodology was applied on a 1/50,000 topomap located in the north of Jeddah city (western region of Saudi Arabia), and we have demonstrated that by using this type of data, it is possible to update topographic maps quickly and at a lower cost while maintaining cartographic precision and accuracy standards.展开更多
GeoData Web service is an important way to achieve the integration and sharing of heterogeneous geospatial data at present. However, due to the complexity of GeoData and no sematic supporting Webservice discovery, it ...GeoData Web service is an important way to achieve the integration and sharing of heterogeneous geospatial data at present. However, due to the complexity of GeoData and no sematic supporting Webservice discovery, it is very hard for data users to accurately find the GeoData WebService they really want. In order to make it easy for users to quickly and accurately find the GeoData Web Service they want in semantic level, this article firstly, constructs MetaData Ontololy, and uses MetaData Ontology to describe the related semantic information for GeoData Web Service. Then it comes up with a new way of computing the degree of semantic similarity among concepts based on Ontology. Finally, it realizes the automatic discovery for GeoData Web Service based on semantic matching. The experiment result shows that the way in this article can dramatically improve the accuracy and intelligence of GeoData Web Service discovery.展开更多
Based on various experiences in developing Geodata Infrastructures(GDIs)for scientific applications,this article proposes the concept of a Scientific GDI that can be used by scientists in environmental and earth scien...Based on various experiences in developing Geodata Infrastructures(GDIs)for scientific applications,this article proposes the concept of a Scientific GDI that can be used by scientists in environmental and earth sciences to share and disseminate their research results and related analysis methods.Scientific GDI is understood as an approach to tackle the science case in Digital Earth and to further enhance e-science for environmental research.Creating Scientific GDI to support the research community in efficiently exchanging data and methods related to the various scientific disciplines forming the basis of environmental studies poses numerous challenges on today’s GDI developments.The paper summarizes requirements and recommendations on the publication of scientific geospatial data and on functionalities to be provided in Scientific GDI.Best practices and open issues for governance and policies of a Scientific GDI are discussed and are concluded by deriving a research agenda for the next decade.展开更多
The research of Geographical Information System(GIS)is one of the most active fields today.With the development of GIS,the OpenGIS specification comes into being. It is currently in its initial stage. The goal of Open...The research of Geographical Information System(GIS)is one of the most active fields today.With the development of GIS,the OpenGIS specification comes into being. It is currently in its initial stage. The goal of OpenGIS specification is to solve the geodata sharing and interoperable geoprocessing,and to provide the service of the geodata sharing and geographical information. This paper presents the goal,scope,service,status of OpenGIS specification and its perspective.展开更多
针对当前新型基础测绘建设中开展的基础地理信息数据库三维化、实体化升级改造探索,本文提出了借鉴瑞士三维地形数据库(Swisstopo 3D geodata)建设的相关技术方法。分析了Swisstopo 3D geodata的数据结构与内容,以及其实现各类地形实体...针对当前新型基础测绘建设中开展的基础地理信息数据库三维化、实体化升级改造探索,本文提出了借鉴瑞士三维地形数据库(Swisstopo 3D geodata)建设的相关技术方法。分析了Swisstopo 3D geodata的数据结构与内容,以及其实现各类地形实体对象三维化、实体化的技术方法,并介绍了其数据采集更新与数据应用情况等其他内容。在此基础之上,探讨了其对我国新型基础测绘建设的借鉴意义:(1)我国应加快新型基础测绘建设,为"两服务、两支撑"提供高质量的基础时空信息保障;(2)三维矢量模型技术是实现基础地理信息数据库三维化升级的一条可行的技术路线;(3)建筑物三维模型产品设计应体现基础性与公益性要求。展开更多
文摘This paper addresses how open geodata and crowd-sourced geodata, and the open geoportals might be integrated with the mainstream surveying and mapping practices to update traditional topomaps quickly and inexpensively, that might be otherwise impossible to do it due to economic and logistic situations. The abundant geographic data on the internet could be used to update topographic maps while avoiding the time-consuming nature of the traditional method. To be able to use them, it is necessary to measure and quantify the quality of these data, as well as to verify their credibility, in order to incorporate them into official topographic maps. The proposed approach takes advantage of neocartography, and it’s not about further developing a new approaches, but looking differently at how data is collected, assembled controlled and been used for updating topomaps. At the beginning, the methodology used about how open geodata and crowd-sourced geodata involved in collecting, simplifying, generalizing, controlling and generating useful cartographic information that complement traditional and conventional counterparts is presented. This methodology was applied on a 1/50,000 topomap located in the north of Jeddah city (western region of Saudi Arabia), and we have demonstrated that by using this type of data, it is possible to update topographic maps quickly and at a lower cost while maintaining cartographic precision and accuracy standards.
文摘GeoData Web service is an important way to achieve the integration and sharing of heterogeneous geospatial data at present. However, due to the complexity of GeoData and no sematic supporting Webservice discovery, it is very hard for data users to accurately find the GeoData WebService they really want. In order to make it easy for users to quickly and accurately find the GeoData Web Service they want in semantic level, this article firstly, constructs MetaData Ontololy, and uses MetaData Ontology to describe the related semantic information for GeoData Web Service. Then it comes up with a new way of computing the degree of semantic similarity among concepts based on Ontology. Finally, it realizes the automatic discovery for GeoData Web Service based on semantic matching. The experiment result shows that the way in this article can dramatically improve the accuracy and intelligence of GeoData Web Service discovery.
文摘Based on various experiences in developing Geodata Infrastructures(GDIs)for scientific applications,this article proposes the concept of a Scientific GDI that can be used by scientists in environmental and earth sciences to share and disseminate their research results and related analysis methods.Scientific GDI is understood as an approach to tackle the science case in Digital Earth and to further enhance e-science for environmental research.Creating Scientific GDI to support the research community in efficiently exchanging data and methods related to the various scientific disciplines forming the basis of environmental studies poses numerous challenges on today’s GDI developments.The paper summarizes requirements and recommendations on the publication of scientific geospatial data and on functionalities to be provided in Scientific GDI.Best practices and open issues for governance and policies of a Scientific GDI are discussed and are concluded by deriving a research agenda for the next decade.
文摘The research of Geographical Information System(GIS)is one of the most active fields today.With the development of GIS,the OpenGIS specification comes into being. It is currently in its initial stage. The goal of OpenGIS specification is to solve the geodata sharing and interoperable geoprocessing,and to provide the service of the geodata sharing and geographical information. This paper presents the goal,scope,service,status of OpenGIS specification and its perspective.
文摘针对当前新型基础测绘建设中开展的基础地理信息数据库三维化、实体化升级改造探索,本文提出了借鉴瑞士三维地形数据库(Swisstopo 3D geodata)建设的相关技术方法。分析了Swisstopo 3D geodata的数据结构与内容,以及其实现各类地形实体对象三维化、实体化的技术方法,并介绍了其数据采集更新与数据应用情况等其他内容。在此基础之上,探讨了其对我国新型基础测绘建设的借鉴意义:(1)我国应加快新型基础测绘建设,为"两服务、两支撑"提供高质量的基础时空信息保障;(2)三维矢量模型技术是实现基础地理信息数据库三维化升级的一条可行的技术路线;(3)建筑物三维模型产品设计应体现基础性与公益性要求。
