A method for extracting rake fishing status based on fishing vessel position data

Abstract

The invention relates to a method for extracting a rake catching state based on fishing boat position data. The method for extracting the rake catching state based on the fishing boat position data comprises the steps that a navigational speed threshold value of a dragging state is determined according to a rate of change of navigational speed frequency; a point in a range of the navigational speed threshold value is preliminarily judged as a dragging rake state point; other points in a same time period before and after with the dragging rake state point which is preliminarily judged are counted, if more than half of the other points are in the dragging rake state, the dragging rake state point which is preliminarily judged is identified as the dragging rake state point; the cumulative time or the cumulative mileage of a dragging rake is calculated for a period of time. The method for extracting the rake catching state based on the fishing boat position data uses big dipper fishing boat position data of the rake fishing boat and determines a fishing boat state according to the navigational speed threshold value, the cumulative dragging time and distribution thereof of the fishing boat are counted, accordingly, a rake fishing boat working rule can be accurately acknowledged, and a reference can be provided to the relevant policy for formulating fishing gears and a fishing law.

Description

technical field [0001] The invention relates to the technical field of fishing boat position data mining, in particular to a method for extracting rake fishing status based on fishing boat position data. Background technique [0002] Fishing gear is designed according to the ecology, habits and some biological scales of the fishing objects. The rake fishing gear is traditional fishing gear and is distributed in coastal areas. Bottom shellfish in silt, gravel substrates, or active gear for entanglement fish. The Ministry of Agriculture's "Notice on Prohibited Fishing Gear" banned 4 kinds of rake-type fishing gear operations, including towed pump suction rake, towed handle hook rake, towed water flushing toothed rake, towed beam net rake, and there are still dragging rakes Transitional rake fishing gear such as rake, shovel rake spade shovel rake, hook rake tooth rake, hook shank hook rake and other permitted rake fishing gear. China's offshore resources are seriously declin...

AI Technical Summary

Problems solved by technology

In the 1990s, Europe began to install VMS (vessel monitoring system) on fishing boats to assist fishing boat management. In recent years, there have been researches on using VMS data to estimate fishing effort and fishery resource assessment. Foreign VMS is mainly based on AIS technology, sending ship positions every 30 minutes or 1 hour data, poor temporal resolution, and limited AIS coverage, often with data loss

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