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Vladimir Ryakhovsk, SGM RAS (Russian Federation)
Vladimir Serebryakov, Dorodnitsyn's Computation Center RAS (Russian Federation)
Andrey Vershinin, Moscow Institute of Physics and Technology (Russian Federation)
Le Dat Din, Lomonosov's Moscow State Universitry (Russian Federation)
Ilya Diakonov, Dorogovitsin's Computation Center RAS (Russian Federation)
Alexandr Shkotin, Dorogovitsin's Computation Center RAS (Russian Federation)
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During last 3-4 years active work of the Open Geospatial Consortium (OGC) in the field of standardization enabled huge breakthrough in use of Internet-GIS, Standards on description, representation, storing and methods of access to maps and other geospatial data (such as GMS, WMS, WFS, WCS, CSW, etc.) were developed and adopted on different organizational levels right up to ISO. All reports of the Open GIS Consortium are bagged in the NTTP-report that gives the opportunity to the user to work with the cartographical information using arbitrary Web-client, or specialized Internet GIS supplement. It is possible to store the cartographical information in the files of a standard format or in the form of records in a database, which, using the trivial transformations can be presented in the form of the language objects of GML or ArcXML (the specification of the package ArcIMS by ESRI).
Like in every large distributed information system in Internet-HIS problems of informational compatibility are usually divided into levels namely technical interoperability, syntactical interoperability and semantic interoperability. However the process of standardization provides solutions basically on first two levels while third level was left under no consideration. To solve them we use Semantic Web technologies in our architecture. Implementation of the OWL-ontology based on ISO 19115 and ISO 19119 (and also on Russian national profile GOST-R 52573-2006 and metadata schemas of the largest SDI) standards and use it as basic metadata schema allow mutual understanding (i.e. semantic interoperability) between systems that participate in distributed interaction. The result of integration based on common set of standard domain ontologies will be unified in the sense of data semantics environment that allow distributed search, visualization, access and processing of geospatial information. Thus, the architecture of the developed portal Geology consists of the following major components: embedded GIS-client that visualizes maps and data received from WMS, WFS or WCS; GIS-server (Mapserver v.4.8.), which provides access to maps and other geospatial data stored on the server in files or database tables (PostgreSQL with spatial extension PostGIS). A user can view maps and data stored at portal Geology simply in his/her Web-browser or use specialized thick GIS-clients from any high-grade GIS-system. But often it comes that also some additional information are required for processing these maps and data - here comes geoprocessing services. The next step in development of the distributed geoinformation environment is to provide catalogs and search engines that allow users easily find needed data and services by its metadata. Such functionality is realized by the GeoMETAsystem and integrated through standard CSW and custom RDF-based interfaces with portal Geology.
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