José Eduardo Córcoles

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OGC (OpenGIS Consortium) is contributing with a XML specification to the representation of geographic information (called GML 2.0 - Geographical Markup Language) [13]. GML allows the exchange of geographic information in the Web. The models based on XML benefit the interoperability, and thus GML allows the exchange of geographic information on the Web.(More)
The fact that GML is an XML encoding allows it to be queried. In order to query a GML document we have designed a query language over GML/XML enriched with spatial operators. This query language has an underlying data model and algebra that supplies the semantics of the query language. In order to use this query language, it is necessary to find an(More)
The fact that GML is an XML encoding allows it to be queried. In order to query a GML document we have designed a query language over GML/XML enriched with spatial operators. This query language has an underlying data model and algebra that supplies the semantics of the query language. In this paper, we propose an approach for integrating Geospatial data on(More)
The research community has begun an effort to investigate foundations for the next stage of the Web, called Semantic Web [1]. Current efforts include the Extensible Markup Language XML, the Resource description Framework, Topic Maps and the DARPA Agent Markup Language DAML+OIL. A rich domain that requires special attention is the semantics of geospatial(More)
This paper introduces an efficient non-blocking spatial join (NSJ, for short) algorithm to deal with spatial objects from remote sources via underlying network. The objectives of NSJ are: (1) start reporting the first output join results as soon as possible, and (2) minimize the cost for output the remaining results. As some other previous non-blocking join(More)
In tackling the semantic Web, a rich domain that requires special attention is the Semantic Geospatial Web. We make a contribution to the Semantic Geospatial Web by defining an approach based on an ontology for integrating nonspatial resources such as html, pdf, pictures (gif, jpg), etc., with GML documents. It is based on a catalog, which stores(More)
Nowadays, there are a huge number of Spatial Data Infrastructures (SDIs) offering public spatial services. For this reason, it is very difficult for a user to know what spatial service could satisfy his/her needs. The SDI community now demands an approach for integrating SDI services and relating them with semantic features. In order to contribute to a(More)
As a database format, XML (GML by extension) can be queried. In order to do this, we need a query language (of general use) to retrieve information from an XML document. Nevertheless, it is necessary to enrich the query language over XML features with spatial operators if we wish to apply it over spatial data encoded with GML. Otherwise, these query(More)