|Table of Contents|

Computation method of ship domains in restricted waters based on AIS data(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2015年05期
Page:
110-117
Research Field:
交通信息工程及控制
Publishing date:

Info

Title:
Computation method of ship domains in restricted waters based on AIS data
Author(s):
XIANG Zhe;  HU Qin-you;  SHI Chao-jian;  YANG Chun
School of Merchant Marine, Shanghai Maritime University, Shanghai 201306, China
Keywords:
marine technology;  ship domain;  restricted waters;  AIS data;  data mining;  grid frequency diagram
PACS:
U675.7
DOI:
-
Abstract:
In order to obtain the ship domains in restricted waters, a method was proposed by using large volume of AIS data. The AIS data of target ships were selected, and the waters nearby target ships were gridded. The occupy frequencies of other ships in each grid were calculated, and the grid frequency graph of single ship was extracted. The ship sizes were considered in the calculation process. Through overlying all grid frequency graphs of target ships with certain length, the grid frequency graph of specific ship was achieved. The grids in the grid frequency graphs were filled with colors according to different frequencies, then the shape of specific ship domain was observed clearly. Through fracturing and measuring the surface of ship domain, the length of ship domain was acquired. The proposed method was verified by using the AIS data from ships navigating in Nancao Restricted Waters of Shanghai Port. The domains of ships with the lengths of 60-79, 80-99, 100-119, 120-139, 140-159 m were calculated. Analysis result indicates that since the ship sizes are taking into consideration, the direction of ship domain’s long axis has a portside deflection angle to heading, the angles are 3.37°, 9.46°, 17.53°, 10.78°, 8.13°respectively for the five types of ships. The length ratios of ship domain to ship decrease with the increase of ship length, and the ratios are 6.00, 5.80, 5.67, 5.43 and 5.13 respectively for the five types of ships. So the shape of ship domain in restricted waters is irregular ellipse, and the length ratio of ship domain to ship is not constant. 1 tab, 16 figs, 20 refs.

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Last Update: 2015-10-20