浙江省近海海洋捕捞渔船异地停靠信息提取与分析

根据船籍港管理制度要求，所有渔船必须在休渔期返回船籍港停靠休渔，渔船不能到非船籍港停靠。为调查渔船异地休渔情况，该研究提出一种基于北斗卫星导航系统的船位数据提取渔船异地停靠信息的方法。首先查找出渔船停船时段，选择停船时间较长的时间段，获得该停船时段内渔船停靠地的经度和纬度，利用高德地图提供的逆地址查询Web服务，获取停船地点所属的省、市、区县，然后将停船地址与船籍港对比，判断渔船是否属于异地停靠。以浙江省为例，选用2018年北斗卫星导航系统的船位数据，提取浙江省渔船异地停靠的信息，并进行统计分析，得到跨省停靠休渔的渔船占比为2.60%，省内跨市停靠的占比为5.53%，市内夸区县停靠的占比为14.74%，该方法能够快速提取和统计渔船的异地停靠信息，为休渔期渔船管理的信息化提供技术支持。

Extraction and analysis of off-site docking information of offshore fishing vessels in Zhejiang Province of China

Abstract: According to the requirements of port management system, all fishing vessels must stop fishing and return to their registry ports during the summer fishing moratorium. Fishing vessels are not allowed to dock at the non-registry port. In order to investigate the fishing vessels docking at other provinces or cities' ports which are not their registry ports during the summer fishing moratorium, a method to extract the off-site docking information of offshore fishing vessels based on Beidou navigation satellite system position data was proposed in this paper. First of all, we need to find out the time periods during which the fishing boat stoped sailing, and then selected the longest time period and obtained the longitude and latitude of the location where the boat stoped during the longest time period. The reverse address query web service provided by Gaud map was used to obtain the provinces, cities and districts based on the longitude and latitude. Then compared the docking address with that of registry ports to determine whether the vessel was off-site docked. Taking Zhejiang Province of China as an example, the fishing vessels positions data of vessel monitoring systems based on Beidu Navigation Satellite System was used to extract the off-site docking information and conduct statistical analysis. The results showed that 2.75% of fishing vessels docked across provinces, 5.86% of fishing vessels docked across cities in the province and 15.6% of fishing vessels docked accross district in the city。This method can quickly extract and count off-site docking information of fishing vessels, and provided technical support for fishing vessel's management information during the fishing moratorium.