Blower J.D., Masó J., Díaz D., Roberts C.J., Griffiths G.H., Lewis J.P., Yang X., Pons X. (2015) Communicating thematic data quality with web map services. ISPRS International Journal of Geo-Information. 4: 1965-1981.EnllaçDoi: 10.3390/ijgi4041965
Geospatial information of many kinds, from topographic maps to scientific data, is increasingly being made available through web mapping services. These allow georeferenced map images to be served from data stores and displayed in websites and geographic information systems, where they can be integrated with other geographic information. The Open Geospatial Consortium's Web Map Service (WMS) standard has been widely adopted in diverse communities for sharing data in this way. However, current services typically provide little or no information about the quality or accuracy of the data they serve. In this paper we will describe the design and implementation of a new "quality-enabled" profile of WMS, which we call "WMS-Q". This describes how information about data quality can be transmitted to the user through WMS. Such information can exist at many levels, from entire datasets to individual measurements, and includes the many different ways in which data uncertainty can be expressed. We also describe proposed extensions to the Symbology Encoding specification, which include provision for visualizing uncertainty in raster data in a number of different ways, including contours, shading and bivariate colour maps. We shall also describe new open-source implementations of the new specifications, which include both clients and servers. © 2015 by the authors; licensee MDPI, Basel, Switzerland.
Kresse W., Pau J.M. (2015) Development of an ISO-standard for the preservation of geospatial data and metadata: ISO 19165. Photogrammetrie, Fernerkundung, Geoinformation. 2015: 449-456.EnllaçDoi: 10.1127/pfg/2015/0278
Most of the paper maps produced a century ago are still very accessible in cartographic libraries preserved by the producer. It is our present obligation to guarantee the preservation of digital geospatial data today and allow for digital cartographic accessibility one century into the future. In addition, there is an increasing demand for older maps that goes beyond pure historical interest motivated by the study of dynamic problems such as impacts of the climate change, human activities and sustainability. The long-term preservation of large volumes of geospatial data in a uniform way still remains an unsolved question. A systematic solution has been demanded by National Mapping and Archival Agencies in Europe and North America. One year ago the ISO/TC 211 "Geographic information /Geomatics" published a New Work Item Proposal (NWIP) named ISO 19165 "Preservation of digital data and metadata" accompanied by a Working Draft document. The proposed standard is built upon the principles laid down in the ISO 14721 "Open Archival Information Systems" and upon thedatamodehofthe ISO 19115-1 "Metadata - Part 1: Fundamentals". This article reports on the specialization of both standards for the purpose of archiving of geospatial data and asks for contributions to the ISO 19165 under development. © 2015 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.
Ménard L., Nüst D., Ngo K.-M., Blanc P., Jirka S., Masó J., Ranchin T., Wald L. (2015) Interoperable Exchange of Surface Solar Irradiance Observations: A Challenge. Energy Procedia. 76: 113-120.EnllaçDoi: 10.1016/j.egypro.2015.07.867
We present how implementations of the Sensor Web Enablement framework of the Open Geospatial Consortium are integrated into an existing spatial data infrastructure. The result is registered as a community portal for professionals in solar energy in the GEOSS Common Infrastructure, demonstrating the benefits of interoperable exchange of in-situ time-series observations of surface solar irradiation. Easy access to, and sharing of data improves the information base for planning and monitoring of solar power resources. Providing users with visualization and download functionality for in-situ measurements is a key aspect for engaging the energy community to share, release and integrate in-situ measurements. © 2015 The Authors.
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