International Journal of Spatial, Temporal and Multimedia Information Systems (5 papers in press)
Interoperable geoprocessing services on the French hydrographical network and finalised application
by Mauclerc Anthony
Abstract: This paper focuses on a set of geoprocessing services that were developed and are now exposed in an interoperable way (compliant with OGC WPS standard) to publicly offer basic operations on the French hydrographical network (e.g. computing the upstream/downstream of a river). Both organizational and architectural issues are discussed. In a second part, the way those services are now used and chained with other components in finalised solutions is detailed. More specifically, this point is illustrated through integration in an application dealing with ecological continuity issues, or, in other words: how to help experts to identify and prioritize the most appropriate set of flow barriers (mills, dams) to equip or remove with respect to a given budget in order to improve the overall continuity. This last example is entirely based on interoperable components and gives a valuable feedback on building a whole architecture on such services.
Keywords: interoperability, OGC standards, Web Processing Service (WPS), web services chaining and orchestration, hydrographical network, ecological continuity, decision-aid tool, planning policy.
Coupling spatialized models to evaluate the effects of urban densification on air quality in the Paris metropolitan area
by Julie Prud'homme
Abstract: Compact city concept has been widely debated and analysed in literature. Many methodologies have been established, in which the air quality issue was more or less studied. In this , we propose a methodological perspective that identifies the impact of territorial policies, socio-economic parameters, energy consumption constraints and urban shape on the structure of anthropogenic emissions, and thus on urban and suburban air quality on the case of the Paris metropolitan area (France). To do so, we use a spatialized modelling chain designed to explore the interactions between urban shape and pollutant concentrations in the atmosphere.
Keywords: Spatial modelling; atmospheric pollution; urban growth; urban policies.
Effectiveness of Morphological Reconstruction Operators in Change Detection for Remote Sensing Images
by Madhu Khurana, Vikas Saxena
Abstract: Change Detection (CD) in multi-temporal images aims at quantifying the temporal effects or changes in remote sensing images taken at different times of the same area of Earth. With huge constellations of Satellites set up by various countries, monitoring the Earths surface for changes helps us understand and respond to various natural phenomena affecting the Earths atmosphere. In this paper, we have used texture features along with the spectral features for CD. The texture features have been extracted after applying three different morphological reconstruction operators, namely, opening by reconstruction, closing by reconstruction and opening of closing by reconstruction. Also flat and non-flat Structuring Elements (SE) have been used for applying morphological reconstruction. The paper compares the impact of different types of morphological operators on the accuracy of the CD. It also presents the comparison between the effectiveness of flat and non-flat SEs on the accuracy.
Keywords: Change Detection; Morphological Reconstruction; Extreme Learning Machine.
The Stick operator : The management of several points of view in a Geographical Information System
by Géraldine Del Mondo, Michel Mainguenaud
Abstract: In this article, we propose the Stick operator which provides a unique point of view from two points of view in the context of a Geographical Information System. It is based on two alphanumeric data models we merge in order to obtain a single data model (i.e., the result of the Stick operator). This operator uses a set of rules defined on characteristics of data models associated with each point of view. These characteristics are based on the links between the spatial dimension and alphanumeric data. It can be used when two different levels of details/abstraction or two sources have to be merged.rnWe rely on a labeled graph to formalize data models and work till the attribute level. The Stick operator takes advantage of characteristics such as the intersection of graphs, the existence of quasi-strongly connected graphs or paths to provide an extended result data model.
Keywords: semantic alphanumeric data; levels of abstraction; geographical information systems; data model merge; graph data model; database view; database snapshot;.
Conditional Privacy Preserving Authentication in VANETs: A Survey
by Soukeina Zouaidi, Ilhem Lengliz, Abdelfettah Belghith
Abstract: The trade off between authentication and privacy is a key security aspect in Vehicular Ad hoc NETworks (VANET). While it is necessary to authenticate and identify each communicating vehicle, it remains mandatory to insure and maintain the privacy. To this end, conditional privacy preserving authentication has been proposed. This paper surveys the existing literature on authentication schemes that conditionally thrive to protect the privacy in vehicular networks. We firstly introduce the most relevant proposed privacy preservation techniques. Then, we examine and categorize several authentication protocols based on their adopted privacy technique, pseudonyms based protocols, group signature based protocols, ring signature based protocols, blind signature based protocols, group signcryption based protocols and hybrid protocols which integrate more than one privacy preservation technique. We finally present a comparative analysis of the surveyed protocols, and identify some possible future research directions.
Keywords: Intelligent transportation; VANET; security; authentication; conditional privacy-preservation.