In the research field of Geographic Information Systems (GIS), a cooperative effort has been undertaken by several international organizations to define standards and specifications for interoperable systems. The Web Processing Service (WPS) is one of the most recent specifications of the Open Geospatial Consortium (OGC). It is designed to standardize the way that GIS calculations are made avai...

The OGC Web Processing Service (WPS) specification allows generating information by processing distributed geospatial data made available through Spatial Data Infrastructures (SDIs). However, current SDIs have limited analytical capacities and various problems emerge when trying to use them in data and computing-intensive domains such as environmental sciences. These problems are usually not or...

Today, the existence of metadata is one of the most important keys for an effective discovery of geospatial data published in Spatial Data Infrastructures (SDI). However, due to lack of efficient mechanisms, integrated in user daily workflow, to assist users in generating metadata, little metadata is produced. This paper presents a mechanism for generating and publishing metadata with a Publica...

Web service (WS) orchestration can be considered as a fundamental concept in service-oriented architectures (SOA), as well as in spatial data infrastructures (SDI). In recent years in SOA, advanced solutions were developed, such as realizing orchestrated web services on the basis of already existing more fine-granular web services by using standardized notations and existing orchestration engin...

Discovery of suitable web services is a crucial task in spatial data infrastructures. We present a novel approach to the semantic discovery of Geoprocessing Services (WPS). Requests and WPS are annotated as conjunctive queries in a logic programming (LP) language and the discovery process is based on LP query containment checking between these descriptions. Besides the types of input and output...

The integration of multiple geodata sets is a major challenge for developing Spatial Data Infrastructures (SDIs). Currently, this integration is achieved using schema transformation processes. However, as SDIs mature and the need for more complex transformation processes increases, generalization provides appropriate tools for supporting complex transformations for the integration of different ...

A Web process (WP) is a process that coordinates a set of Web services, as a cohesive unit of work in order to achieve common goals. In spite of the growing interest to Web services, current technologies are found lacking efficient transactional support for such applications. In this paper, we propose a transactional framework that enhances service description for a better characterization, a m...

The Semantic Web relies on carefully structured, well defined data to allow machines to communicate and understand one another. In many domains (e.g. geospatial) the data being described contains some uncertainty, often due to bias, observation error or incomplete knowledge. Meaningful processing of this data requires these uncertainties to be carefully analysed and integrated into the process ...