An Ontology of the Submarine Relief for Analysis and Representation on Nautical Charts

Cartography and Geographic Information Science

Saux

2016

Self Cite

On 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 propose a multi-agent system for nautical chart generalization that is driven by the knowledge on the generalization process and the undersea features and their relationships. Firstly, this work provides a featurecentered ontology modeling the generalization process. Then, the MAS structure is introduced where agents access cartographic knowledge stored in the ontology. The MAS makes use of measure algorithms to evaluate constraint violations on the chart in order to decide which generalization operators to apply. The whole model has been implemented to provide generalization plans on a real case study.

Section: Organization Of the Frameworkmentioning

confidence: 99%

Section: System Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An ontology-driven multi-agent system for nautical chart generalization

Yan

Cartography and Geographic Information Science

Saux

2016

Self Cite

“…Figure 2 shows the structure of the subject ontology. A full description of properties, relationships and concepts involved at top level and application level is given in [11]. Properties describing the features are the composition (e.g.…”

Section: The Subject Ontologymentioning

confidence: 99%

An Ontology for Submarine Feature Representation on Charts

Lecture Notes in Computer Science

Saux

2014

Self Cite

A landform is a subjective individuation of a part of a terrain. 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 definition mainly for naming and communication purpose. This terminology is here used as a starting point for the definition of an ontology of undersea features and their automatic classification from a terrain model. First, an ontology of undersea features is built. The ontology is composed of an application domain ontology describing the main properties and relationships between features and a representation ontology deals with representation on a chart where features are portrayed by soundings and isobaths. A database model was generated from the ontology. Geometrical properties describing the feature shape are computed from soundings and isobaths and are used for feature classification. An example of automatic classification on a nautical chart is presented and results and ongoing research are discussed.

“…Each model is usually created in a specific context. For example, Yan et al [9] provided an ontology to model undersea features. The set of undersea features is organised in a taxonomy providing descriptions at different levels of granularity.…”

Section: Introductionmentioning

confidence: 99%

Towards a Common Framework for the Identification of Landforms on Terrain Models

Moulin

2017

IJGI

Self Cite

A landform is a physical feature of the terrain with its own recognisable shape. Its definition is often qualitative and inherently vague. Hence, landforms are difficult to formalise in a logical model that can be implemented. We propose for that purpose a framework where these qualitative and vague definitions are transformed successively during different phases to yield an implementable data structure. Our main consideration is that landforms are characterised by salient elements as perceived by users. Hence, a common prototype based on an object-oriented approach is defined that shall apply to all landforms. This framework shall facilitate the definition of conceptual models for other landforms and relies on the use of ontology design patterns to express common elements and structures. The model is illustrated on examples from the literature, showing that existing works undertaken separately can be developed under a common framework.