Feature‐Driven Generalization of Isobaths on Nautical Charts: A Multi‐Agent System Approach

Guilbert, Éric

doi:10.1111/tgis.12147

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…Based on the sounding points from the chart, a depth model can be constructed with a Triangulated Irregular Network (TIN) (Zhang et al, 2008). Considering the ship's draft, the safe depth contours are traced from the depth model, and thus the shallow depth areas are acquired (Zhang, 2011; Zhang et al, 2008; Peters et al, 2014; Guilbert, 2016).…”

Section: The Basic Theory Of the Existing Methodsmentioning

confidence: 99%

Automatic Ship Routing with High Reliability and Efficiency between Two Arbitrary Points at Sea

2018

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Due to the limitations of the existing methods (for example, the route binary tree method) that can only automatically generate routes based on a single chart, a method for automatically generating the shortest distance route based on an obstacle spatial database is proposed. Using this proposed method, the route between two arbitrary points at sea can be automatically generated. First, the differences in accuracy and updating time of charts are quantitatively analysed. Next, the mechanism for updating obstacles is designed, an obstacle spatial database is constructed, and the obstacle data extracted from multiple charts are fused. Finally, considering the effect of efficiency on the amount of obstacle data, a route window and an improved R-tree index are designed for quickly extracting and querying the obstacle database. The experimental results demonstrate that compared with existing methods, the proposed method can generate the shortest distance between two arbitrary points at sea and eliminates the limitation of the area of the chart. In addition, with data from multiple charts, the route generated by the proposed method is more reliable than that of the existing methods, and it is more efficient.

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Section: The Basic Theory Of the Existing Methodsmentioning

confidence: 99%

Automatic Ship Routing with High Reliability and Efficiency between Two Arbitrary Points at Sea

2018

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“…When piloting the vessel via the IWW, the electronic chart display and information systems (ECDIS) showed their effectiveness for orienting the navigator and assessing the parameters of the vessel's motion in relation to ensuring navigational safety [10][11][12]. The position of the vessel on the fairway can be described by the following parameters: distance from the center of mass of the vessel from the axis of the fairway and drift angle.…”

Section: Practical Acquisition Of Navigational Information When Pilot...mentioning

confidence: 99%

Fundamentals of training navigators of ships flying foreign flags when entering the inland waterways of the Russian Federation

Burkov¹,

Prokhorenkov²,

Efimov³

2022

E3S Web Conf.

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Navigation on inland waterways, such as rivers, canals, fairways via reservoirs and lakes is performed under conditions of a minimum under the keel clearance, hydrodynamic interaction between the ship's hull and underwater limits of the fairway, and the impact of irregular currents. Piloting a ship difficult navigational conditions requires the navigator to monitor continuously the ship’s motion, assess quickly the situation and develop optimal decision for ship handling, have sufficient navigational experience and a large amount of practical knowledge. To achieve a high level of qualification, the training of navigators is carried out in several ways at once - general and particular pilotage, organization of navigation safety and the theoretical foundations of ship handling. Lack of theoretical or practical knowledge can lead to wrong assessment of navigation situation and therefore be considered as factor limiting passage of vessel and navigational safety. The article contains analysis of inland waterways navigation particulars as basis of training for navigators of ships flying foreign flags when entering the inland waterways of the Russian Federation to reduce influence of limiting factors and support the navigational safety.

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“…Generalization operators such as smoothing, displacement, deletion, aggregation and enlargement are applied to depth contours to improve map legibility and aesthetics [15]. Based on this idea, Zhang and Guilbert [16] introduced a multi-agent system (MAS) for depth contours generalization, which was implemented and tested on a set of contours at 1:50,000 scale provided by the French Hydrographic and Oceanographic Service (Service Hydrographique et Océanographique de la Marine, SHOM) [15]. The results satisfy the legibility constraint, however the morphology of the seafloor seems to be over-smoothed due to regular distances between depth contours.…”

Section: Depth Contours Generalization-related Workmentioning

confidence: 99%

Depth Contours and Coastline Generalization for Harbour and Approach Nautical Charts

Skopeliti

Tsoulos

Pe’eri

2021

IJGI

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Generalization of nautical charts and electronic nautical charts (ENCs) is a critical process which aims at the safety of navigation and clear cartographic presentation. This paper elaborates on the problem of depth contours and coastline generalization—natural and artificial—for medium-scale charts (harbour and approach) taking into account International Hydrographic Organization (IHO) standards, hydrographic offices’ (HOs) best practices and cartographic literature. Additional factors considered are scale, depth, and seafloor characteristics. The proposed method for depth contour generalization utilizes contours created from high-resolution digital elevation models (DEMs) or those already portrayed on nautical charts. Moreover, it ensures consistency with generalized soundings. Regarding natural coastline generalization, the focus was on managing the resolution, while maintaining the shape, and on the islands. For the provision of a suitable generalization solution for the artificial shoreline, it was preprocessed in order to automatically recognize the shape of each structure as perceived by humans (e.g., a pier that looks like a T). The proposed generalization methodology is implemented with custom-developed routines utilizing standard geo-processing functions available in a geographic information system (GIS) environment and thus can be adopted by hydrographic agencies to support their ENC and nautical chart production. The methodology has been tested in the New York Lower Bay area in the U.S.A. Results have successfully delineated depth contours and coastline at scales 1:10 K, 1:20 K, 1:40 K and 1:80 K.

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Feature‐Driven Generalization of Isobaths on Nautical Charts: A Multi‐Agent System Approach

Cited by 11 publications

References 17 publications

Automatic Ship Routing with High Reliability and Efficiency between Two Arbitrary Points at Sea

Automatic Ship Routing with High Reliability and Efficiency between Two Arbitrary Points at Sea

Fundamentals of training navigators of ships flying foreign flags when entering the inland waterways of the Russian Federation

Depth Contours and Coastline Generalization for Harbour and Approach Nautical Charts

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