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Current status and future directions of geoportals 被引量:1
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作者 Hao Jiang John van Genderen +2 位作者 Paolo Mazzetti Hyeongmo Koo Min Chene 《International Journal of Digital Earth》 SCIE 2020年第10期1093-1114,共22页
Geoportals are a consolidated web-based solution to provide open spatial data sharing and online geo-information management.Their roles and possible advancements according to the Digital Earth vision and implementatio... Geoportals are a consolidated web-based solution to provide open spatial data sharing and online geo-information management.Their roles and possible advancements according to the Digital Earth vision and implementation require investigations.This paper presents a review of the literature concerning geoportals and serves the following primary purposes.First,various geoportal approaches for discovering and accessing Earth observation data and geo-information,mainly with scientific purposes,are summarized according to their characteristics and functionalities.Second,current major challenges in geoportals are identified in terms of functionalities,technologies,and especially big data support,from geoportal cases of China.Finally,based on lessons learned from the international and Chinese geoportals,solutions and recommendations for the challenges in geoportals are proposed in terms of their architectures,services,and technologies.The results show that geoportals usually provide access to distributed data systems,offering maps,data discovery,and data downloads.Some of them are also capable of offering online analysis and processing service,enhanced semantic search engines,and dynamic visualization tools.The strength of geoportals could lead to a full-fledged online Digital Earth system that could provide better data sharing and dissemination solutions to the challenges posed by big data. 展开更多
关键词 Geoportal(s) big Earth data Digital Earth taxonomy of geoportals geoportals in China
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A case-based reasoning approach for task-driven spatial-temporally aware geospatial data discovery through geoportals
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作者 Ming Li Wei Guo +1 位作者 Lian Duan Xinyan Zhu 《International Journal of Digital Earth》 SCIE EI 2017年第11期1146-1165,共20页
There is a critical need to develop a means for fast,task-driven discovery of geospatial data found in geoportals.Existing geoportals,however,only provide metadata-based means for discovery,with little support for tas... There is a critical need to develop a means for fast,task-driven discovery of geospatial data found in geoportals.Existing geoportals,however,only provide metadata-based means for discovery,with little support for task-driven discovery,especially when considering spatial–temporal awareness.To address this gap,this paper presents a Case-Based Reasoning-supported Geospatial Data Discovery(CBR-GDD)method and implementation that accesses geospatial data by tasks.The advantages of the CBR-GDD approach is that it builds an analogue reasoning process that provides an internal mechanism bridging tasks and geospatial data with spatial–temporal awareness,thus providing solutions based on past tasks.The CBR-GDD approach includes a set of algorithms that were successfully implemented via three components as an extension of geoportals:ontology-enhanced knowledge base,similarity assessment model,and case retrieval nets.A set of experiments and case studies validate the CBR-GDD approach and application,and demonstrate its efficiency. 展开更多
关键词 Case-based reasoning geospatial data discovery ONTOLOGY geoportals spatial–temporal awareness
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Bridging open source tools and Geoportals for interactive spatial data analytics
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作者 Bing She Tao Hu +1 位作者 Xinyan Zhu Shuming Bao 《Geo-Spatial Information Science》 SCIE CSCD 2019年第3期185-192,共8页
Geoportals have been the primary source of spatial information to researchers in diverse fields.Recent years have seen a growing trend to integrate spatial analysis and geovisual analytics inside Geoportals.Researcher... Geoportals have been the primary source of spatial information to researchers in diverse fields.Recent years have seen a growing trend to integrate spatial analysis and geovisual analytics inside Geoportals.Researchers could use the Geoportal to conduct basic analysis without offline processing.In practice,domain-specific analysis often requires researchers to integrate heterogeneous data sources,leverage new statistical models,or build their own customized models.These tasks are increasingly being tackled with open source tools in programming languages such as Python or R.However,it is unrealistic to incorporate the numerous open source tools in a Geoportal platform for data processing and analysis.This work provides an exploratory effort to bridge Geoportals and open source tools through Python scripting.The Geoportal demonstrated in this work is the Urban and Regional Explorer for China studies.A python package is provided to manipulate this platform in the local programming environment.The server side of the Geoportal implements a set of service endpoints that allows the package to upload,transform,and process user data and seamlessly integrate them into the existing datasets.A case study is provided that illustrated the use of this package to conduct integrated analyses of search engine data and baseline census data.This work attempts a new direction in Geoportal development,which could further promote the transformation of Geoportals into online analytical workbenches. 展开更多
关键词 GEOPORTAL open source Python web GIS spatial analysis
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基于Geoportal的流域水环境信息共享平台设计与实现 被引量:1
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作者 马红旺 高振记 +2 位作者 方利 陈运帷 韩兴刚 《环境工程技术学报》 CAS 2012年第5期390-395,共6页
针对水环境信息的多源、异构、分布式和时效性等特征,研究了基于Geoportal的流域水环境信息共享平台构建技术,同时结合当前水环境管理部门信息存储、管理、使用的现状和面向服务架构(SOA)的设计思想,构建分布式的信息共享平台,实现空间... 针对水环境信息的多源、异构、分布式和时效性等特征,研究了基于Geoportal的流域水环境信息共享平台构建技术,同时结合当前水环境管理部门信息存储、管理、使用的现状和面向服务架构(SOA)的设计思想,构建分布式的信息共享平台,实现空间数据、属性数据以及多格式数据的有效集成共享,提供水环境信息的注册、发布、下载和实时收割等功能,并可为流域水环境风险评估与预警提供实时、准确、可靠的数据服务。 展开更多
关键词 水环境信息 GEOPORTAL 共享
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Nature Conservation and Biodiversity Monitoring through a Spatial Data Infrastructure
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作者 Cristina Oana Cristian Vasile Simona Ipate (Staiculeseu) 《Journal of Geodesy and Geomatics Engineering》 2014年第1期1-10,共10页
One of the main concerns of the European Union environment policy is the deterioration of natural habitats and the threats posed to certain species under the Habitat Directive. With its huge diversity of plant and ani... One of the main concerns of the European Union environment policy is the deterioration of natural habitats and the threats posed to certain species under the Habitat Directive. With its huge diversity of plant and animal species and high level of endemism, Romania is nominated as a European biodiversity hotspot. Biodiversity is being lost at a dramatic rate unless strategically conservation measurements are taken. Halting the loss of biodiversity is regarded as a priority to the European Member States which are encouraged to work together within the same strong legislative framework in order to protect our most vulnerable species and habitat types. Romania is also in the process of developing the Spatial Data Infrastructure in response to Geographic Information 2000 Initiative launched by the European Commission in 1996 and the INSPIRE (Infrastructure for Spatial Information in Europe) initiative launched in 2001. The focus of this article is the development of the geospatial architecture framework and applications required for efficient inventory and mapping of natural habitats and wild species of community interest. Implementing a biodiversity geoportal application is seen as critical in order to help users share the geospatial information in the environment and sustainable development sectors. 展开更多
关键词 geoportals BIODIVERSITY INSPIRE METADATA standards.
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A Sensor Web for Real-Time Groundwater Data Monitoring in Morocco 被引量:1
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作者 Aniss Moumen Hassane Jarar Oulidi +9 位作者 Meryem Agadi Mohamed Nehmadou Mohamed Ben-Daoud Amel Barich Abdelaziz Mridekh Bouabid El Mansouri Said Boutaleb Karim Ben Hachmi Mohammed Ali Essahlaoui Samir Eljaafari 《Journal of Geographic Information System》 2014年第6期613-623,共11页
This article presents research and development of an interoperable platform to facilitate, monitor and coordinate groundwater data sharing. This system was orchestrated by a number of services described by Open Geospa... This article presents research and development of an interoperable platform to facilitate, monitor and coordinate groundwater data sharing. This system was orchestrated by a number of services described by Open Geospatial Consortium (OGC) such as Sensor Observation Service (SOS) and other services for the use of mapping data, Web Feature Services (WFS), Web Map Service (WMS), and catalogue services (CSW). An important activity for our project was the establishment of a portal for geographic data and services. Geoportal developed for this project will promote and facilitate access to groundwater data and share theme more openly. Otherwise our system has been designed to provide a powerful tool that enhances the ability of regional staff to monitor near real-time groundwater data (i.e.?piezometric level) and as a result will help provide a more effective response to environmental upsets. 展开更多
关键词 SENSOR Web OGC GEOPORTAL Geocatalog MONITORING GROUNDWATER Morocco
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Towards a Spatial Data Infrastructure and an Integrated Management of Groundwater Resources
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作者 Hassane Jarar Oulidi Aniss Moumen 《Journal of Geographic Information System》 2015年第6期667-676,共10页
International studies of expertise have shown that the difficulty of data access is one of the major hindrances that brakes any effort to conduct studies on groundwater. This research paper is an attempt to address th... International studies of expertise have shown that the difficulty of data access is one of the major hindrances that brakes any effort to conduct studies on groundwater. This research paper is an attempt to address this problematic through developing a technical framework to implement a Spatial Data Infrastructure (SDI) with a view to improving the status of access to data related to groundwater in Morocco, and achieving their interoperability. This prototype is primarily based on international standards (OGC & ISO) such as Web Map Service (WMS), Web Feature Service (WFS), Catalog Web Service (CSW) and Sensor Observation Service (SOS) accompanied by the use of associated specifications such as Geography Markup Language (GML) and Filter Encoding (FE). This platform is considered both as a tool for sharing updated data collected from numerous and divers source providers, and as a tool of web-based GIS for groundwater management, which constitutes the basis for decision making. 展开更多
关键词 Spatial Data INFRASTRUCTURE GROUNDWATER RESOURCES OGC STANDARDS GEOPORTAL Morocco
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Adopting cloud computing to optimize spatial web portals for better performance to support Digital Earth and other global geospatial initiatives
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作者 Jizhe Xia Chaowei Yang +4 位作者 Kai Liu Zhipeng Gui Zhenlong Li Qunying Huang Rui Li 《International Journal of Digital Earth》 SCIE EI CSCD 2015年第6期451-475,共25页
A spatial web portal(SWP)provides a web-based gateway to discover,access,manage,and integrate worldwide geospatial resources through the Internet and has the access characteristics of regional to global interest and s... A spatial web portal(SWP)provides a web-based gateway to discover,access,manage,and integrate worldwide geospatial resources through the Internet and has the access characteristics of regional to global interest and spiking.Although various technologies have been adopted to improve SWP performance,enabling high-speed resource access for global users to better support Digital Earth remains challenging because of the computing and communication intensities in the SWP operation and the dynamic distribution of end users.This paper proposes a cloud-enabled framework for high-speed SWP access by leveraging elastic resource pooling,dynamic workload balancing,and global deployment.Experimental results demonstrate that the new SWP framework outperforms the traditional computing infrastructure and better supports users of a global system such as Digital Earth.Reported methodologies and framework can be adopted to support operational geospatial systems,such as monitoring national geographic state and spanning across regional and global geographic extent. 展开更多
关键词 CyberGIS/WebGIS GEOPORTAL spatial cloud computing spatiotemporal thinking and computing GEO national geographic state
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