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Eric Saux - One of the best experts on this subject based on the ideXlab platform.
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An ontology-driven multi-agent system for Nautical Chart generalization
Cartography and Geographic Information Science, 2016Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:ABSTRACTOn Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret undersea features. Different techniques were developed for automatic sounding selection and isobath generalization. These methods are mainly used to generate a new Chart from the bathymetric database or from a larger scale Chart through selection and simplification. However, a part of the process consists in selecting and emphasizing undersea features formed by groups of soundings and isobaths on the Chart according to their relevance to maritime navigation. Hence, automation of the process requires classification of features and their generalization through the application of a set of operators according not only to geometric constraints but also to their meaning.The objective of this work is to conceive a multi-agent system (MAS) for Nautical Chart generalization that is driven by the knowledge on the generalization process and the undersea fe...
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An ontology for the generalisation of the bathymetry on Nautical Charts
ISPRS Annals of Photogrammetry Remote Sensing and Spatial Information Sciences, 2014Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:On Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret landforms. Different techniques were developed for automatic soundings selection and isobath generalisation from a sounding set. These methods are mainly used to generate a new Chart from the bathymetric database or from a large scale Chart through selection and simplification however a part of the process consists in selecting and emphasising undersea features on the Chart according to their relevance to navigation. Its automation requires classification of the features from the set of isobaths and soundings and their generalisation through the selection and application of a set of operators according not only to geometrical constraints but also to semantic constraints. The objective of this paper is to define an ontology formalising undersea feature representation and the generalisation process achieving this representation on a Nautical Chart. The ontology is built in two parts addressing on one hand the definition of the features and on the other hand their generalisation. The central concept is the undersea feature around which other concepts are organised. The generalisation process is driven by the features where the objective is to select or emphasise information according to their meaning for a specific purpose. The ontologies were developed in Protege and a bathymetric database server integrating the ontology was implemented. A generalisation platform was also developed and examples of representations obtained by the platform are presented. Finally, current results and on-going research are discussed.
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An ontology for the generalization of the bathymetry on Nautical Charts
2014Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:On Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret landforms. Different techniques were developed for automatic soundings selection and isobath generalisation from a sounding set. These methods are mainly used to generate a new Chart from the bathymetric database or from a large scale Chart through selection and simplification however a part of the process consists in selecting and emphasising undersea features on the Chart according to their relevance to navigation. Its automation requires classification of the features from the set of isobaths and soundings and their generalisation through the selection and application of a set of operators according not only to geometrical constraints but also to semantic constraints. The objective of this paper is to define an ontology formalising undersea feature representation and the generalisation process achieving this representation on a Nautical Chart. The ontology is built in two parts addressing on one hand the definition of the features and on the other hand their generalisation. The central concept is the undersea feature around which other concepts are organised. The generalisation process is driven by the features where the objective is to select or emphasise information according to their meaning for a specific purpose. The ontologies were developed in Protégé and a bathymetric database server integrating the ontology was implemented. A generalisation platform was also developed and examples of representations obtained by the platform are presented. Finally, current results and on-going research are discussed.
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An Ontology of the Submarine Relief for Analysis and Representation on Nautical Charts
The Cartographic Journal, 2013Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:AbstractA Nautical Chart is a kind of map used to describe the seafloor morphology and shoreline of adjacent lands. One of its main purposes is to guarantee safety of navigation. As a consequence, the construction of a Nautical Chart follows very specific rules. The cartographer has to select and highlight undersea features according to their relevance to navigation. In an automated process, the system must be able to identify and classify these features from the terrain model. This paper aims therefore to define ontologies of the submarine relief and Nautical Chart that will be at the root of a model-oriented generalization process. To the best of our knowledge, no ontology has been defined to formalize the geographical and cartographic objects for Nautical Chart representation. Thus, a bottom-up approach was developed to extract and model knowledge derived from standards established by the International Hydrographic Organization (IHO) and cartographers’ expertise. The submarine relief ontology formalize...
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a conceptual model for submarine feature description and generalisation in Nautical Chart production
2012Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:The conference is co-organized by Institute of Space and Earth Information Science, The Chinese University of Hong Kong, National Remote Sensing Center of China and The International Association of Chinese Professionals in Geographic Information Sciences (CPGIS).
Thomas Porathe - One of the best experts on this subject based on the ideXlab platform.
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human error and e navigation developing the Nautical Chart as resilient decision support
International Conference on Human Interface and Management of Information, 2015Co-Authors: Thomas PoratheAbstract:Recent development of HCI on the ship bridge has led to a discussion of deskilling and out of the loop syndrome; of the “navigating navigator” versus the “monitoring navigator”. In this paper work done on some new design concepts for decision-support systems on the ship’s bridge is presented. The work has focused on keeping the navigator in the loop while sharing information to the wider maritime system: route exchange.
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Real seamen never turn the Chart upside down« Safer navigation with egocentric view 3-D Nautical Charts?
2007Co-Authors: Thomas PoratheAbstract:This article presents recent information design research from Malardalen University in Sweden where a project aims at developing a new 3-D Nautical Chart that can be viewed both from a traditional bird’s eye perspective, and from a new egocentric bridge view perspective. In the article an experiment is presented which shows the new egocentric view to be more efficient (faster decision making and fewer errors) than the traditional display modes.
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Real-Time Extraction of Course Track Networks in Confined Waters as Decision Support for Vessel Navigation in 3-D Nautical Chart
2006Co-Authors: Thomas PoratheAbstract:Abstract : In an information design project at Malardalen University in Sweden a computer based 3-D Nautical Chart system is designed based on human factors principles of more intuitive navigation in high speeds. In this project dynamic NoGo area polygons is generated based on the draught of the individual ship and the current water level and by doing so space is divided into free and forbidden areas. Based on this an automatic wayfinding method is presented in this paper that will allow vessels to enter a goal position and have the system display a path through free water to the goal based on different parameters such as shortest route, most weather sheltered route or route most sheltered from radar detection.
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Improved situation awareness in navigation using egocentric view 3-D Nautical Charts
2006Co-Authors: Thomas PoratheAbstract:In spite of all electronic navigation devises on a modern ship bridge, bridge crews sometimes loose their orientation. Reasons for this might be excessive cognitive workload caused by fatigue, short decision times due to high speed or too many instruments to read and integrate. By tradition electronic Chart displays and radar screens are displayed in north-up orientation. On south bound courses this necessitates mental rotations to align the Chart with the real world. Research has shown mental rotations to take time and to be a possible source of errors. In an information design research project on intuitive maps at Malardalen University in Sweden, a 3-D Nautical Chart has been proposed allowing the bridge crew to access an egocentric bridge perspective of the Chart. The cognitive workload is supposedly eased when mental rotations no longer are needed. To test this hypothesis, a laboratory experiment was designed. Forty-five subjects each drove a vehicle trough four different mazes using four different types of maps: a traditional paper Chart, an electronic Chart plotter in northup mode, an electronic Chart plotter in course-up mode and the proposed egocentric 3-D Nautical Chart. The experiment showed significant results suggesting that navigation with a 3-D egocentric display leads to faster decision making and less errors.
Jingya Yan - One of the best experts on this subject based on the ideXlab platform.
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An ontology-driven multi-agent system for Nautical Chart generalization
Cartography and Geographic Information Science, 2016Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:ABSTRACTOn Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret undersea features. Different techniques were developed for automatic sounding selection and isobath generalization. These methods are mainly used to generate a new Chart from the bathymetric database or from a larger scale Chart through selection and simplification. However, a part of the process consists in selecting and emphasizing undersea features formed by groups of soundings and isobaths on the Chart according to their relevance to maritime navigation. Hence, automation of the process requires classification of features and their generalization through the application of a set of operators according not only to geometric constraints but also to their meaning.The objective of this work is to conceive a multi-agent system (MAS) for Nautical Chart generalization that is driven by the knowledge on the generalization process and the undersea fe...
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An ontologies and agents based approach for undersea feature characterisation and generalisation
2014Co-Authors: Jingya YanAbstract:A Nautical Chart is a kind of map used to describe the seafloor morphology and the shoreline of adjacent lands. One of its main purposes is to guaranty safety of maritime navigation. As a consequence, construction of a Nautical Chart follows very specific rules. The cartographer has to select and highlight undersea features according to their relevance to navigation. In an automated process, the system must be able to identify and classify these features from the terrain model.An undersea feature is a subjective individuation of a part of the seafloor. Landform recognition is a difficult task because its definition usually relies on a qualitative and fuzzy description. Achieving automatic recognition of landforms requires a formal definition of the landforms properties and their modelling. In the maritime domain, the International Hydrographic Organisation published a standard terminology of undersea feature names which formalises a set of definitions mainly for naming features and communication purpose. This terminology is here used as a starting point for the automatic classification of the features from a terrain model.In order to integrate knowledge about the submarine relief and its representation on the Chart, this research aims to define ontologies of the submarine relief and Nautical Chart. Then, the ontologies are applied to generalisation of Nautical Chart. It includes two main parts. In the first part of the research, an ontology is defined to organize geographical and cartographic knowledge for undersea feature representation and Nautical Chart generalisation. First, a domain ontology of the submarine relief introduces the different concepts of undersea features with their geometric and topological properties. This ontology is required for the classification of features. Second, a representation ontology is presented, which describes how bathymetric entities are portrayed on the map. Third, a generalisation process ontology defines constraints and operations in Nautical Chart generalisation. In the second part, a generalisation process based on the ontology is designed relying on a multi-agent system. Four kinds of agents (isobath, sounding, feature and group of features) are defined to manage cartographic objects on the Chart. A database model was generated from the ontology. The bathymetric data and the ontology are stored in a triplestore database, and are connected to an interface in Java and C++ to automatically classify the undersea features extracted from the bathymetry, and evaluate the cartographic constraints. At first, geometrical properties describing the feature shape are computed from soundings and isobaths and are used for feature classification. Then, conflicts are evaluated in a MAS and generalisation plans are provided.
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An ontology for the generalisation of the bathymetry on Nautical Charts
ISPRS Annals of Photogrammetry Remote Sensing and Spatial Information Sciences, 2014Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:On Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret landforms. Different techniques were developed for automatic soundings selection and isobath generalisation from a sounding set. These methods are mainly used to generate a new Chart from the bathymetric database or from a large scale Chart through selection and simplification however a part of the process consists in selecting and emphasising undersea features on the Chart according to their relevance to navigation. Its automation requires classification of the features from the set of isobaths and soundings and their generalisation through the selection and application of a set of operators according not only to geometrical constraints but also to semantic constraints. The objective of this paper is to define an ontology formalising undersea feature representation and the generalisation process achieving this representation on a Nautical Chart. The ontology is built in two parts addressing on one hand the definition of the features and on the other hand their generalisation. The central concept is the undersea feature around which other concepts are organised. The generalisation process is driven by the features where the objective is to select or emphasise information according to their meaning for a specific purpose. The ontologies were developed in Protege and a bathymetric database server integrating the ontology was implemented. A generalisation platform was also developed and examples of representations obtained by the platform are presented. Finally, current results and on-going research are discussed.
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An ontology for the generalization of the bathymetry on Nautical Charts
2014Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:On Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret landforms. Different techniques were developed for automatic soundings selection and isobath generalisation from a sounding set. These methods are mainly used to generate a new Chart from the bathymetric database or from a large scale Chart through selection and simplification however a part of the process consists in selecting and emphasising undersea features on the Chart according to their relevance to navigation. Its automation requires classification of the features from the set of isobaths and soundings and their generalisation through the selection and application of a set of operators according not only to geometrical constraints but also to semantic constraints. The objective of this paper is to define an ontology formalising undersea feature representation and the generalisation process achieving this representation on a Nautical Chart. The ontology is built in two parts addressing on one hand the definition of the features and on the other hand their generalisation. The central concept is the undersea feature around which other concepts are organised. The generalisation process is driven by the features where the objective is to select or emphasise information according to their meaning for a specific purpose. The ontologies were developed in Protégé and a bathymetric database server integrating the ontology was implemented. A generalisation platform was also developed and examples of representations obtained by the platform are presented. Finally, current results and on-going research are discussed.
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An Ontology of the Submarine Relief for Analysis and Representation on Nautical Charts
The Cartographic Journal, 2013Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:AbstractA Nautical Chart is a kind of map used to describe the seafloor morphology and shoreline of adjacent lands. One of its main purposes is to guarantee safety of navigation. As a consequence, the construction of a Nautical Chart follows very specific rules. The cartographer has to select and highlight undersea features according to their relevance to navigation. In an automated process, the system must be able to identify and classify these features from the terrain model. This paper aims therefore to define ontologies of the submarine relief and Nautical Chart that will be at the root of a model-oriented generalization process. To the best of our knowledge, no ontology has been defined to formalize the geographical and cartographic objects for Nautical Chart representation. Thus, a bottom-up approach was developed to extract and model knowledge derived from standards established by the International Hydrographic Organization (IHO) and cartographers’ expertise. The submarine relief ontology formalize...
Eric Guilbert - One of the best experts on this subject based on the ideXlab platform.
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An ontology-driven multi-agent system for Nautical Chart generalization
Cartography and Geographic Information Science, 2016Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:ABSTRACTOn Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret undersea features. Different techniques were developed for automatic sounding selection and isobath generalization. These methods are mainly used to generate a new Chart from the bathymetric database or from a larger scale Chart through selection and simplification. However, a part of the process consists in selecting and emphasizing undersea features formed by groups of soundings and isobaths on the Chart according to their relevance to maritime navigation. Hence, automation of the process requires classification of features and their generalization through the application of a set of operators according not only to geometric constraints but also to their meaning.The objective of this work is to conceive a multi-agent system (MAS) for Nautical Chart generalization that is driven by the knowledge on the generalization process and the undersea fe...
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Feature-driven generalization of isobaths on Nautical Charts: a multi-agent system approach
Transactions in Gis, 2015Co-Authors: Eric GuilbertAbstract:A Nautical Chart provides a schematic view of the seafloor where isobaths (contour lines joining points of same depth) and depth soundings are generalized to highlight undersea features that form navigational hazards and routes. Considering that the process is ultimately driven by features and their significance to navigation, this article proposes a generalization strategy where isobath generalization is controlled by undersea features directly. The seafloor is not perceived as a continuous depth field but as a set of discrete features composed by groups of isobaths. In this article, generalization constraints and operators are defined at feature level and composed of constraints and operators applying to isobaths. In order to automate the process, a multi-agent system is designed where features are autonomous agents evaluating their environment in order to trigger operations. Interactions between agents are described and an example on a bathymetric database excerpt illustrates the feasibility of the approach.
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An ontology for the generalisation of the bathymetry on Nautical Charts
ISPRS Annals of Photogrammetry Remote Sensing and Spatial Information Sciences, 2014Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:On Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret landforms. Different techniques were developed for automatic soundings selection and isobath generalisation from a sounding set. These methods are mainly used to generate a new Chart from the bathymetric database or from a large scale Chart through selection and simplification however a part of the process consists in selecting and emphasising undersea features on the Chart according to their relevance to navigation. Its automation requires classification of the features from the set of isobaths and soundings and their generalisation through the selection and application of a set of operators according not only to geometrical constraints but also to semantic constraints. The objective of this paper is to define an ontology formalising undersea feature representation and the generalisation process achieving this representation on a Nautical Chart. The ontology is built in two parts addressing on one hand the definition of the features and on the other hand their generalisation. The central concept is the undersea feature around which other concepts are organised. The generalisation process is driven by the features where the objective is to select or emphasise information according to their meaning for a specific purpose. The ontologies were developed in Protege and a bathymetric database server integrating the ontology was implemented. A generalisation platform was also developed and examples of representations obtained by the platform are presented. Finally, current results and on-going research are discussed.
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An ontology for the generalization of the bathymetry on Nautical Charts
2014Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:On Nautical Charts, undersea features are portrayed by sets of soundings (depth points) and isobaths (depth contours) from which map readers can interpret landforms. Different techniques were developed for automatic soundings selection and isobath generalisation from a sounding set. These methods are mainly used to generate a new Chart from the bathymetric database or from a large scale Chart through selection and simplification however a part of the process consists in selecting and emphasising undersea features on the Chart according to their relevance to navigation. Its automation requires classification of the features from the set of isobaths and soundings and their generalisation through the selection and application of a set of operators according not only to geometrical constraints but also to semantic constraints. The objective of this paper is to define an ontology formalising undersea feature representation and the generalisation process achieving this representation on a Nautical Chart. The ontology is built in two parts addressing on one hand the definition of the features and on the other hand their generalisation. The central concept is the undersea feature around which other concepts are organised. The generalisation process is driven by the features where the objective is to select or emphasise information according to their meaning for a specific purpose. The ontologies were developed in Protégé and a bathymetric database server integrating the ontology was implemented. A generalisation platform was also developed and examples of representations obtained by the platform are presented. Finally, current results and on-going research are discussed.
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An Ontology of the Submarine Relief for Analysis and Representation on Nautical Charts
The Cartographic Journal, 2013Co-Authors: Jingya Yan, Eric Guilbert, Eric SauxAbstract:AbstractA Nautical Chart is a kind of map used to describe the seafloor morphology and shoreline of adjacent lands. One of its main purposes is to guarantee safety of navigation. As a consequence, the construction of a Nautical Chart follows very specific rules. The cartographer has to select and highlight undersea features according to their relevance to navigation. In an automated process, the system must be able to identify and classify these features from the terrain model. This paper aims therefore to define ontologies of the submarine relief and Nautical Chart that will be at the root of a model-oriented generalization process. To the best of our knowledge, no ontology has been defined to formalize the geographical and cartographic objects for Nautical Chart representation. Thus, a bottom-up approach was developed to extract and model knowledge derived from standards established by the International Hydrographic Organization (IHO) and cartographers’ expertise. The submarine relief ontology formalize...
Chengxiang Wang - One of the best experts on this subject based on the ideXlab platform.
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Spatial Indexing for Effective Visualization of Vector-Based Electronic Nautical Chart
2016 International Conference on Industrial Informatics - Computing Technology Intelligent Technology Industrial Information Integration (ICIICII), 2016Co-Authors: Yu Yu, Li Yang, Chengxiang WangAbstract:Electronic Nautical Chart is widely used in sailing to ensure the safety. In this paper, we focus on effective visualization of vector-based electronic Nautical Chart with spatial indexing enhancement. Spatial indexing has been widely used in spatial data management to improve the performance of data retrieval. Spatial indexed system electronic Nautical Chart is constructed with R-tree. With the electronic Nautical Chart visualization stack proposed in this paper, the performance of R-tree indexed system electronic Nautical Chart is evaluated and the result show its feasibility.
