In this paper, we present a metadata mediation approach to intelligent integration of semantically heterogeneous geographical information (GI). Based on formalized metadata and expert system technology. the system can...In this paper, we present a metadata mediation approach to intelligent integration of semantically heterogeneous geographical information (GI). Based on formalized metadata and expert system technology. the system can understand metadata of GI, represent explicit metadata knowledge, and use metadata mediator to automatically detect Semantic conflicts and resolve them: Furthermore, the prototype of metadata mediator has been given in this paper.展开更多
Metadata,data about other digital objects,play an important role in FAIR with a direct relation to all FAIR principles.In this paper we present and discuss the FAIR Data Point(FDP),a software architecture aiming to de...Metadata,data about other digital objects,play an important role in FAIR with a direct relation to all FAIR principles.In this paper we present and discuss the FAIR Data Point(FDP),a software architecture aiming to define a common approach to publish semantically-rich and machine-actionable metadata according to the FAIR principles.We present the core components and features of the FDP,its approach to metadata provision,the criteria to evaluate whether an application adheres to the FDP specifications and the service to register,index and allow users to search for metadata content of available FDPs.展开更多
OCLC的自动元数据映射服务(Godby,Smith and Childress,2008)一文规范了"映射"的概念。如Gill等所定义的,隐藏起具体的技术细节,而以语义元素的对等关系作为中心内容。这样做可以让元数据专家(他们通常并不是程序员)负责建立...OCLC的自动元数据映射服务(Godby,Smith and Childress,2008)一文规范了"映射"的概念。如Gill等所定义的,隐藏起具体的技术细节,而以语义元素的对等关系作为中心内容。这样做可以让元数据专家(他们通常并不是程序员)负责建立映射所需的逻辑关系电子表格,程序据此自动将其转换成可执行的代码。论述DC-Term(限定版DC)应用纲要与MARC映射的管理及实现方法。对应用纲要进行编码时,映射方案需要在对照表的基础上增加两项内容:一是标注元素所属的命名域,二是标注"上位元素"和"下位元素"的关系,例如DC的Cov-erage(范围)元素和Spatial(空间)元素就存在这种关系。这些信息可以供"OCLC语义对等描述语言(Semantic E-quivalence Expression Language,SEEL)"生成脚本文件,用于"元数据自动映射Web服务"进行"生产级"的元数据翻译工作。由于这样只需要关注元素,元素可以混搭、匹配、增添和再定义,因此元数据"应用纲要"(Heery andPatel,2000)非常适合采用这个翻译模型,通过成对元素之间的映射,实现元数据方案的互操作。展开更多
The Sensor Web has emerged from Earth Science research with the development of Web technology,to achieve process automation,sensor interoperation,and service synergy.These promises require the discovery of the right s...The Sensor Web has emerged from Earth Science research with the development of Web technology,to achieve process automation,sensor interoperation,and service synergy.These promises require the discovery of the right sensor at the right time and the right location with the right quality.Metadata,for sensor,platform,and data,are crucial for achieving such goals.However,analysis and practical use of these metadata reveals that the metadata and their associations are not applicable or suitable for the Sensor Web.The shortfalls are(1)the nonstandard metadata expression language;(2)the missing link between sensor and domain knowledge;(3)the insufficiency in the information for geographic locating and sensor tasking;and(4)the enhanced requirements on the quality,security,and ownership of both sensors and their sensed data.This paper reviews the current standards that have metadata components for the sensor and its platform,especially those from ISO TC211,Open Geospatial Consortium Inc.,and The National Aeronautics and Space Administration Global Change Master Directory.A recommendation on metadata that meets the requirement of crossmission sensor discovery in a pervasive Web environment is derived from them.The recommendation addresses issues on language formalization,sensor geolocation,semantics,quality,and accessibility.Roles of the emerging semantic Web technology for enabling robust discovery of sensor are discussed.展开更多
文摘In this paper, we present a metadata mediation approach to intelligent integration of semantically heterogeneous geographical information (GI). Based on formalized metadata and expert system technology. the system can understand metadata of GI, represent explicit metadata knowledge, and use metadata mediator to automatically detect Semantic conflicts and resolve them: Furthermore, the prototype of metadata mediator has been given in this paper.
文摘Metadata,data about other digital objects,play an important role in FAIR with a direct relation to all FAIR principles.In this paper we present and discuss the FAIR Data Point(FDP),a software architecture aiming to define a common approach to publish semantically-rich and machine-actionable metadata according to the FAIR principles.We present the core components and features of the FDP,its approach to metadata provision,the criteria to evaluate whether an application adheres to the FDP specifications and the service to register,index and allow users to search for metadata content of available FDPs.
基金The study is supported in part by the NASA AIST program(Grant#NNX06AG04G,PI:Dr.Liping Di).
文摘The Sensor Web has emerged from Earth Science research with the development of Web technology,to achieve process automation,sensor interoperation,and service synergy.These promises require the discovery of the right sensor at the right time and the right location with the right quality.Metadata,for sensor,platform,and data,are crucial for achieving such goals.However,analysis and practical use of these metadata reveals that the metadata and their associations are not applicable or suitable for the Sensor Web.The shortfalls are(1)the nonstandard metadata expression language;(2)the missing link between sensor and domain knowledge;(3)the insufficiency in the information for geographic locating and sensor tasking;and(4)the enhanced requirements on the quality,security,and ownership of both sensors and their sensed data.This paper reviews the current standards that have metadata components for the sensor and its platform,especially those from ISO TC211,Open Geospatial Consortium Inc.,and The National Aeronautics and Space Administration Global Change Master Directory.A recommendation on metadata that meets the requirement of crossmission sensor discovery in a pervasive Web environment is derived from them.The recommendation addresses issues on language formalization,sensor geolocation,semantics,quality,and accessibility.Roles of the emerging semantic Web technology for enabling robust discovery of sensor are discussed.
