为保证船舶AIS航迹数据的有效管理,提升船舶管理水平,研究提升算法下船舶AIS航迹数据压缩方法。该方法通过IEC61162-1标准和ITU1371-1协议,转换AIS轨迹数据格式,采用基于偏序集的规则链方法清洗转换后的AIS数据,并完成数据中经度和纬度的坐标转换。将数据存储在SQLite数据库,并按照时间顺序将其导入提升算法中,通过该算法压缩船舶AIS航迹数据,获取船舶AIS压缩后航迹数据。测试结果显示:该方法的压缩率均在90.6%以上,数据长度损失率最大值为0.11%,压缩效果较好,并且可保证压缩后数据的完整性;压缩后可较好地保存船舶转向行为数据点,确保数据的效用成果,提升船舶的管理水平。
In order to ensure the effective management of ship AIS track data and improve the level of ship management water, a compression method for ship AIS track data under the improvement algorithm is studied. This method first converts the AIS trajectory data format through the IEC61162-1 standard and the ITU1371-1 protocol, and then uses a rule chain method based on partial order sets to clean the transformed AIS data; After completing the coordinate conversion of longitude and latitude in the data, it is stored in the SQLite database and imported into the lifting algorithm in chronological order. The ship AIS track data is compressed using this algorithm to obtain the ship AIS compressed track data. The test results show that the compression rate of this method is above 90.6%, and the maximum data length loss rate is 0.11%. The compression effect is good, and the integrity of the compressed data can be guaranteed. After compression, the data points of ship turning behavior can be well preserved, ensuring the effectiveness of the data and improving the management level of the ship.
2023,45(16): 157-160 收稿日期:2023-3-18
DOI:10.3404/j.issn.1672-7649.2023.16.033
分类号:U675
作者简介:吴晓阳(1981-),男,硕士,讲师,研究方向为数据库和数据分析
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