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Analysis of crowdsourced bathymetry concept and It's potential implications on safety of navigation

Pavić I., Mišković J., Alujević D.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2020

Vol. 14. no. 3

681--686

Crowdsourced bathymetry (CSB) is relatively new concept of collecting bathymetric data. CSB can be defined as the collection and sharing of depth data (and metadata) measured and collected by non-traditional survey vessels equipped with navigation instruments, while maintaining their usual operations at sea. International Hydrographic Organization (IHO) has developed Guidance on CSB. This document provides framework for data collection, processing and information about data uncertainty. IHO has also developed model within CSB concept in order to make standardization of CSB data. The data collected using CSB may represent valuable supplement to the existing data collected by hydrographic survey. Despite this fact it is necessary to emphasize that CSB data cannot be used as official data. CSB data collection has also potential legal issues due to the character of sounding passage within territorial and internal waters of coastal states. This paper emphasized the differences between hydrographic survey and CSB. Advantages and disadvantages are analyzed with it's potential implication on safety of navigation. Due to the CSB data collection model limitations, development of bathymetric data collection model on national level is recommended.

Method foranalyzing AIS data and determination of simultaneously ships passage via strait of split

Bukljaš M., Vukša S., Pavić I.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2018

Vol. 12, no. 4

679--684

The traffic density is a basic characteristic of marine traffic for some navigational area. In the case of narrow channels such as Strait of Split (Splitska vrata), apart from the traffic density, the number of simultaneous ship passages is also important as well as ships characteristics. Based on such data, additional navigational safety guidelines and regulations may be planned for the observed area. The purpose of this research is to determine the number of simultaneous ship passages via Strait of Split for a certain period of time. Collected AIS data in SPNMEA format was decoded by AIS Decoder online program to csv file. For five randomly selected days in the summer period, based on AIS data, the number of simultaneous ship passages was determined and ships information presented.