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A visual query language for dynamic processes applied to a scenario driven environment
Linköping University, Department of Computer and Information Science, GIS - Geographical Information Science Group. Linköping University, The Institute of Technology.
Linköping University, Department of Computer and Information Science, GIS - Geographical Information Science Group. Linköping University, The Institute of Technology.
2007 (English)In: Journal of Visual Languages and Computing, ISSN 1045-926X, Vol. 18, no 3, 315-338 p.Article in journal (Refereed) Published
Abstract [en]

Query languages for multi-sensor data sources are generally dealing with spatial–temporal data that in many applications are of geographical type. Such applications are quite often concerned with dynamic activities where the collected sensor data are streaming in from multiple sensors. Data uncertainty is one of the most important issues, which the query language must deal with. Other aspects of concern are sensor data fusion but also association of multiple object observations. Demonstration of the dynamic aspects are generally difficult as scenarios in real-time cannot easily be set up, tested and run realistically. To overcome this problem the query language sigma query language (ΣQL) has been attached to a simulation framework. Together with this framework scenarios can be set up to form the basis for test and dynamic illustration of the query language. Eventually the query language can be used to support decision making as well. Within the simulation framework input data are coming from sensor models that eventually can be replaced by data from real sensors. Services can be integrated with the information system, used for various purposes and supported by the various capabilities of the query language. A consequence of this approach is that the information delivered by the services, including the query language, can be used as input to an operational picture that eventually can be used to demonstrate on-going dynamic processes. In this work, an extension to ΣQL, called VisualΣQL, will be discussed together with some other relevant services useful in dynamic situations as complements to the query language. Furthermore, the use of the system will be illustrated and discussed by means of a scenario that has been run in the simulation environment.

Place, publisher, year, edition, pages
2007. Vol. 18, no 3, 315-338 p.
Keyword [en]
Query language, Sensor datasources, Simulation framework, Scenario driven
National Category
Computer Science
Identifiers
URN: urn:nbn:se:liu:diva-12673DOI: 10.1016/j.jvlc.2007.02.004OAI: oai:DiVA.org:liu-12673DiVA: diva2:16827
Available from: 2007-10-25 Created: 2007-10-25 Last updated: 2009-04-09
In thesis
1. A visual query language served by a multi-sensor environment
Open this publication in new window or tab >>A visual query language served by a multi-sensor environment
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

A problem in modern command and control situations is that much data is available from different sensors. Several sensor data sources also require that the user has knowledge about the specific sensor types to be able to interpret the data.

To alleviate the working situation for a commander, we have designed and constructed a system that will take input from several different sensors and subsequently present the relevant combined information to the user. The users specify what kind of information is of interest at the moment by means of a query language. The main issues when designing this query language have been that (a) the users should not have to have any knowledge about sensors or sensor data analysis, and (b) that the query language should be powerful and flexible, yet easy to use. The solution has been to (a) use sensor data independence and (b) have a visual query language.

A visual query language was developed with a two-step interface. First, the users pose a “rough”, simple query that is evaluated by the underlying knowledge system. The system returns the relevant information that can be found in the sensor data. Then, the users have the possibility to refine the result by setting conditions for this. These conditions are formulated by specifying attributes of objects or relations between objects.

The problem of uncertainty in spatial data; (i.e. location, area) has been considered. The question of how to represent potential uncertainties is dealt with. An investigation has been carried out to find which relations are practically useful when dealing with uncertain spatial data.

The query language has been evaluated by means of a scenario. The scenario was inspired by real events and was developed in cooperation with a military officer to assure that it was fairly realistic. The scenario was simulated using several tools where the query language was one of the more central ones. It proved that the query language can be of use in realistic situations.

Place, publisher, year, edition, pages
Institutionen för datavetenskap, 2007. 67 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1333
Keyword
query language, command and control, spatial, temporal, uncertainty, sensor data independance, visual query language, sensor data source
National Category
Computer Science
Identifiers
urn:nbn:se:liu:diva-10089 (URN)978-91-85895-79-3 (ISBN)
Presentation
2007-11-15, Alan Turing, Hus E, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Note
Report code: LiU-Tek-Lic-2007:42.Available from: 2007-10-25 Created: 2007-10-25 Last updated: 2009-04-24

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Camara (Silvervarg), KarinJungert, Erland

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