Mr. Hu Zhao Profile

Hu Zhao

at Wuhan Univ

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Proceedings Article | 29 December 2008 Paper

Framework research of semantic sharing and interoperability of geospatial information

Hu Zhao, Lin Li, Yunfei Shi

Proceedings Volume 7285, 728529 (2008) https://doi.org/10.1117/12.815567

KEYWORDS: Web services, Geographic information systems, Internet, Standards development, Information science, Data processing, Information fusion, Databases, Information technology, Process modeling

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Knowledge sharing and semantic interoperability is a significant research theme in Geographical Information Science (GIScience) because many researchers believe that semantic heterogeneity has been identified as the main obstacle for GIScience development. Interoperability issues can exist at three levels: syntactic, structural (also called systemic) and semantic. The former two, however, can be achieved by implementing international or domain standards proposed by several organizations, for example, Open Geospatial Consortium (OGC), World Wide Web Consortium (W3C) and the International Organization for Standardization/Technical Committee for Geographic information/Geomatics (ISO/TC 211). In this paper, we are concentrating on semantic interoperability, which is the sort of topic that halt conversations and cause people's eyes to glaze over, from two aspects: data/information/knowledge and operation/processing. We presented a service-centered architecture for semantic interoperability of geospatial data and processes. OGC standards like Web Feature Service (WFS) and Web Map Service (WMS) have been employed as normative interfaces for analyzing requests, division requests and delivering small requests. Ontology has been introduced to describe distributed resource including various data and geo-processing operations. The role of interoperability, especially from semantic perspective, has been distinguished at the first section in this paper. As a fundamental principal, the following section introduces semantic web, web service and other related works at this orientation. We present our service-based architecture in detail and its simple application at part three. Conclusion and further orientations have been illustrated at last section.

Proceedings Article | 1 August 2007 Paper

COM-based expert system for map projection selection

Hu Zhao, Haihong Zhu, Lin Li, Yong Xing

Proceedings Volume 6751, 675115 (2007) https://doi.org/10.1117/12.759722

KEYWORDS: Visualization, Geographic information systems, Human-machine interfaces, Laser induced breakdown spectroscopy, Artificial intelligence, Logic, Software development, Sun, Computer programming, Standards development

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Map projections are attempts to portray the surface of the earth or a portion of the earth onto a flat map surface. This can not be done without any distortions of conformality, distance, direction, scale, and area. There are many map projections, and each of them has its own set of advantages and disadvantages. The mapmaker must select the one best suited to their application needs, reducing distortion of the most important features. However, how to select a 'proper' map projection is a complex process involving general evaluation of map projection alternatives based on a set of characteristics that describe these projections. And this process needs a systemic understanding of map projection, which usually can not be achieved by end users. This paper introduced Expert system (ES) to solve this problem, and used Component Objects Model (COM) technology to develop and interoperate the proposed system (developed with Visual Prolog 7.0 Personal Edition®) with professional Geographical Information System (GIS) software. As an essential part of the article, the authors also represented the knowledge, rules and reasoning methods of selecting an appropriate map projection as well. Implementations and examples had been given to testify the feasibility.

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