碩士 / 國立臺灣海洋大學 / 通訊與導航工程系 / 96 / Modern electronic navigation sensors such as Global Positioning System (GPS) can continuously provide rather accurate own ship position. However, if mariners still have to plot the GPS position on the paper chart, transfer the route plan or tracks between charts of various scales and coverage, and to check the charted depth and obstructions in relation to own ship’s condition, most of the benefits are lost. Therefore, it is necessary to use electronic navigational charts for the integration of electronic information to help reduce user’s work load and improve the efficiency and safety of navigation. The system promoted by international organizations for such integration is called “Electronic Chart Display and Information System (ECDIS)”.
Due to the strict performance requirement and type approval standards,
the cost of ECDIS is very high. Most vessels, especially those on domestic voyage only, tend to use non-standard electronic chart systems (ECS). Almost all these systems use proprietary electronic charts digitized from various sources, instead of an official Electronic Navigational Charts (ENC) in standard IHO (International Hydrographic Organization) S57 format. The use of these systems has resulted in concerns in navigation-safety due to incompatible coordinate systems, language barrier in user interface, lack of chart updates, etc.
This thesis aims to design and implement a prototype of low cost electronic chart navigation system suitable for domestic users. The design is implemented with Python and open source libraries, including GDAL/OGR, GEOS, and PyGTK. This prototype system can read S57 ENCs and their updates into the system and generate a chart display according to mariner’s settings of own ship’s safety depth as well as other preferences. Chart display and query functions such as zooming, shifting the display center, distance measurement, pick query of chart object information and cursor pointed geographic coordinates are implemented. A flexible GPS interface with com port scan and validity check is also provided, so that users can easily connect GPS to this electronic chart navigation system to show valid GPS position directly on the chart. The displayed chart text and the user interface are all in Chinese language. The system is designed such that safety benefits are least compromised with the low cost.
| Identifer | oai:union.ndltd.org:TW/096NTOU5300004 |
| Date | January 2007 |
| Creators | Ming-Yuan Kao, 高明遠 |
| Contributors | Shwu-Jing Chang, 張淑淨 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 56 |
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