CN104615643A - Method of extracting rake catching state based on fishing boat position data - Google Patents
Method of extracting rake catching state based on fishing boat position data Download PDFInfo
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- 238000013075 data extraction Methods 0.000 claims description 5
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- 241001504769 Bovichtidae Species 0.000 claims description 4
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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
The present invention relates to data mining technology field, fishing boat accommodation, particularly relate to a kind of method of fishing for state based on fishing boat accommodation data extraction rake thorn.
Background technology
Fishing gear is that ecology, habit and some the biology yardsticks according to fished species designs, rake thorn class fishing gear is traditional fishing gear, all there is distribution coastland, towing rake thorn uses fishing boat towing tooth harrow type or fishing jig type fishing gear, benthic mollusca in harrow shallow sea silt, grit substrate, or thorn twines the initiative fishing gear of fish.The operation of 4 kinds of rake thorn class fishing gears is have disabled in Ministry of Agriculture's " forbidding fishing gear is noticed ", comprise towing pump suction rake thorn, pull handle hook rake thorn, towing water rushes tooth harrow rake thorn, net rake thorn is restrainted in towing, still there is the transition rake such as towing tooth harrow rake thorn, shovel rake spade shovel rake thorn, the mutatis mutandis rakes such as hook ratchet rake rake thorn, hook thorn handle hook rake thorn.CHINESE OFFSHORE Resource deplete is serious, and the Fishing Gear and Fishing Method such as rake thorn are further specification urgently, studies its space-time characteristic rule, has important reference value for specification Fishing Gear and Fishing Method.The nineties in 20th century, Europe started on fishing boat, install the auxiliary fishing boat management of VMS (vessel monitoring system), occur in recent years calculating fishing effort by VMS data, the researchs such as fisheries stock assessment, external VMS is mainly based on AIS technology, accommodation data are sent every 30min or 1h, temporal resolution is poor, and AIS limited coverage area, often there is loss of data.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method of fishing for state based on fishing boat accommodation data extraction rake thorn, accurately can understand rake thorn fishing boat operation orderliness.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of and extract based on fishing boat accommodation data the method that rake thorn fishes for state, comprise the following steps:
(1) speed of a ship or plane threshold range of the state that pulls is judged according to speed of a ship or plane frequency change rate;
(2) point in speed of a ship or plane threshold range is tentatively judged as towing rake thorn state point;
(3) statistics is being tentatively judged as that towing rake thorn state point is with other points in the time period of front and back, if other points over half be towing rake thorn state, be describedly tentatively judged as that towing rake thorn state point is defined as towing rake thorn state point;
(4) cumulative time or the mileage of towing rake thorn in a period of time is calculated.
Described step (1) is front also to be comprised: the accommodation point data of each for fishing boat towing rake thorn ship whole year is divided into groups by the speed of a ship or plane, the data amount check dropped in different groups is this class frequency, the ratio of the sum of frequency and accommodation point is called frequency, obtains speed of a ship or plane frequency change rate.
The accommodation point data of each for fishing boat towing rake thorn ship whole year is divided into groups by speed of a ship or plane interval 0.1m/s.
In described step (4), accumulative towing time of a rake thorn ship a period of time or mileage are used
calculate, wherein, Z
icumulative time or the mileage of towing rake thorn in a period of time, P
i,j, P
i, j-1be time or the position of two adjacent accommodation points, i is certain towing rake thorn, j is towing rake thorn sum, p is that certain once pulls certain towpoint in rake thorn, n is that certain once pulls the sum of towpoint in rake thorn; First time summation is cumulative time or the mileage of a rake thorn towing, and second time summation is accumulative fishing time or the mileage of a period of time multiple towing rake thorn.
Beneficial effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, there is following advantage and good effect: the present invention utilizes the Big Dipper accommodation data of rake thorn fishing boat, according to speed of a ship or plane threshold decision fishing boat state, the accumulative towing time of statistics fishing boat and distribution thereof, thus accurately can understand rake thorn fishing boat operation orderliness, provide reference for formulating Fishing Gear and Fishing Method relevant policies.
Accompanying drawing explanation
Fig. 1 is some distribution schematic diagram in B302639 accommodation in embodiment;
Fig. 2 is 500 Big Dipper accommodation locus of points figure of B302639 in embodiment;
Fig. 3 is 500 accommodation point longitude and latitude change curves of B302639 in embodiment;
Fig. 4 is 500 accommodation point speed of a ship or plane change curves of B302639 in embodiment;
Fig. 5 is towing and non-Condition Of Tow chart of frequency distribution in 500 accommodation points of B302639 in embodiment;
Fig. 6 is three rake thorn ship histograms in embodiment;
Fig. 7 is three rake thorn ship frequency change rate figure in embodiment;
Fig. 8 is the state verification schematic diagram of 500 accommodation points of B302639.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiments of the present invention relate to a kind of method of fishing for state based on fishing boat accommodation data extraction rake thorn, comprise the following steps: (1) judges the speed of a ship or plane threshold value of the state that pulls according to speed of a ship or plane frequency change rate; (2) point in speed of a ship or plane threshold range is tentatively judged as towing rake thorn state point; (3) statistics is being tentatively judged as that towing rake thorn state point is with other points in the time period of front and back, if other points over half be towing rake thorn state, be describedly tentatively judged as that towing rake thorn state point is defined as towing rake thorn state point; (4) cumulative time or the mileage of towing rake thorn in a period of time is calculated.
The present invention is further illustrated below by a specific embodiment.
1. fish for process analysis procedure analysis
Big Dipper fishing boat accommodation data mainly comprise Big Dipper card number, the longitude and latitude position of fishing boat, the speed of a ship or plane, course, transmitting time (Big Dipper fishing boat accommodation point is hereinafter referred to as accommodation point).Within 2013, collect B302639 rake thorn ship 62794 accommodations point (see Fig. 1), drag strike mostly is thing or north and south, mainly be distributed in Haizhou Wan fishing ground, connect green stone fishing ground, fishing boat state can demonstrate navigation, towing rake thorn, at a slow speed (or casting anchor).
Choose in the accommodation point of rake thorn ship B302639 in 2013 on February 20th, 2013 4:46:04 to February in 2013 5:58:04 on the 21st 500 points as sample, a in Fig. 2 is the enlarged drawing of Fig. 1, rake thorn ship B302639 is at Dec 15 and 16 days job position, towing rake thorn 1 ~ 4, b and c in Fig. 2 is the enlarged drawing of 4 towing rake thorns, has marked out fishing boat navigation direction in figure.
Fishing boat towing rake thorn track is east-west direction distribution, each towing rake thorn has multiple round towing (see the b and c) of Fig. 2, therefore longitude has multiple broken line (see Fig. 4), in towing rake thorn 1 ~ 4, have twice between rake thorn 1,4 and rake thorn 2,3 move (see Fig. 2 a), therefore there is twice jump (see Fig. 4) in latitude.Centered by the Big Dipper accommodation central point of 500 sampling points (120.212 ° of E, 34.73679 ° of N), each Big Dipper accommodation point to the longitude and latitude distance of this point, as centre distance (see Fig. 5).
Speed of a ship or plane change has certain periodicity (see Fig. 4), and 500 sample points comprise 4 cycles of A ~ C state, and in B state, the speed of a ship or plane is eminence slightly, has the flex point of centre distance.Due to marine environment more complicated in fishing boat operation process, the speed of a ship or plane is also unstable in each state phase, occurs saltus step once in a while, and as there is middling speed in C1, C4 place at a slow speed stage, the higher speed of a ship or plane appears in B2, B3 place, and therefore each stage there will be mixing of other speed of a ship or plane a small amount of.
2. condition adjudgement
The speed of a ship or plane in the A height speed of a ship or plane, B, the low speed of a ship or plane of C (comprise at a slow speed, cast anchor, drift about) three kinds of states are significantly distinguished by speed of a ship or plane change (Fig. 4), if the middle speed of a ship or plane (about 3 joint) continues 4 hours, can be judged as that towing rake thorn fishes for state (hereinafter referred to as Condition Of Tow) from the experience of towing rake thorn fishing operation, the high speed of a ship or plane, the low speed of a ship or plane are that non-towing rake thorn fishes for state (hereinafter referred to as non-Condition Of Tow).In conjunction with the space tracking figure (b of Fig. 2 and c) and speed of a ship or plane variation diagram (Fig. 4) of sample point, towing rake thorn fishing operation totally four times can be judged, every subjob comprise navigation and put rake thorn (the A height speed of a ship or plane), pull (in B the speed of a ship or plane), the receive rake thorn process of (the low speed of a ship or plane of C).Status time period is as table 1, and towing rake thorn average out to 4.95h, receives rake thorn average out to 0.34h.Put the normal and navigation of rake thorn to combine, time shorter about 10 ~ 15min.
Table 1 rake thorn ship B302639 state demarcation
3. threshold speed scope is determined
The data of accommodation sample point are pressed speed of a ship or plane interval 0.1m/s and are divided into groups, and the data amount check dropped in different groups is this class frequency.Have 100 points to be non-Condition Of Tows in 500 sample accommodation points, 400 points are Condition Of Tows, and point class frequency is as Fig. 5, and Condition Of Tow is mainly distributed in 1 ~ 1.9m/s, and the minimum value of the scope of this speed of a ship or plane and maximal value are as threshold value.
The accommodation point data of rake thorn ship B302639, rake thorn ship B303423, rake thorn ship B302794 whole year is pressed speed of a ship or plane interval 0.1m/s and is divided into groups, the number dropping on different class midpoint is this class frequency, the ratio of the sum of frequency and accommodation point is called frequency, can find out data distribution situation similar (Fig. 6) substantially by the frequency of speed of a ship or plane group.
The threshold range (Fig. 7) of each rake thorn ship Condition Of Tow is judged by the turning point of rake thorn ship frequency change rate, B302639 Condition Of Tow speed of a ship or plane threshold range is 1 ~ 1.9m/s, B303423 Condition Of Tow speed of a ship or plane threshold range is 1.1 ~ 2.1m/s, B302794 Condition Of Tow speed of a ship or plane threshold range is 1.2 ~ 2.6m/s.
4. state is extracted
Marine environment more complicated in fishing boat operation process, the speed of a ship or plane is also unstable in each state phase, occurs saltus step once in a while.During according to speed of a ship or plane threshold decision rake thorn boat state, there will be a small amount of non-Condition Of Tow point in the continuous Condition Of Tow of a period of time, also there is this problem in non-Condition Of Tow.The method adopting current point state to compare with front and back dotted state can correct this problem,
Tentatively judge Condition Of Tow point by the threshold value of Condition Of Tow, select this Condition Of Tow point 3, left side point and 3, the right point respectively, if the point of more than 50% is Condition Of Tow, just determine that this point is Condition Of Tow point.
The accumulative towing time of a rake thorn ship a period of time calculates by formula (1).
Wherein, Z
iaccumulative towing time or the mileage of certain towing rake thorn a period of time, P
i,j, P
i, j-1be time or the position of two adjacent accommodation points, both mistimings are the towing time, and distance is towing mileage.First time summation is cumulative time or the mileage of a rake thorn towing, i is certain towing rake thorn, j is towing rake thorn sum, p is that certain once pulls certain towpoint in rake thorn, n is that certain once pulls the sum of towpoint in rake thorn, and second time summation is accumulative fishing time or the mileage of a period of time multiple towing rake thorn.
Extracted the Condition Of Tow point of rake thorn ship B302639, B303423, B302794 according to above method by VS2010C# programming, add up Condition Of Tow cumulative time and the accumulative mileage (see table 2) in each month.June 1 was fishing off season to September 15, and fishing boat does not go to sea, at only operation two weeks in September; Rake thorn ship B302639 5,9 ~ Dec, B303423 4, May do not have data.Towing rake thorn cumulative time and accumulative mileage longer month, owing to terminating in fishing off season during this period of time, productivity effect was good, and fishing time is long in 10 ~ Dec.
Table 2 rake thorn boat state is extracted
5. state verification
Manual verification (Fig. 8) is carried out with 500 sample points of rake thorn ship B302639, be judged as that non-Condition Of Tow point has 95, wherein actual non-towing rake thorn state point has 94, judgment accuracy is 98.95%, be judged as towing rake thorn state point 405, wherein actual towing rake thorn state point has 399, and judgment accuracy is 98.52%; Or 100 non-towing rake thorn state points, be judged as that the point of Condition Of Tow has 6, misjudgment rate is 6%, 400 towing rake thorn state points, and be judged as the point 1 of non-Condition Of Tow, misjudgment rate is 0.25%.
Claims (4)
1. extract based on fishing boat accommodation data the method that rake thorn fishes for state, it is characterized in that, comprise the following steps:
(1) speed of a ship or plane threshold range of the state that pulls is judged according to speed of a ship or plane frequency change rate;
(2) point in speed of a ship or plane threshold range is tentatively judged as towing rake thorn state point;
(3) statistics is being tentatively judged as that towing rake thorn state point is with other points in the time period of front and back, if other points over half be towing rake thorn state, be describedly tentatively judged as that towing rake thorn state point is defined as towing rake thorn state point;
(4) cumulative time or the mileage of towing rake thorn in a period of time is calculated.
2. method of fishing for state based on fishing boat accommodation data extraction rake thorn according to claim 1, it is characterized in that, described step (1) is front also to be comprised: the accommodation point data of each for fishing boat towing rake thorn ship whole year is divided into groups by the speed of a ship or plane, the data amount check dropped in different groups is this class frequency, the ratio of the sum of frequency and accommodation point is called frequency, obtains speed of a ship or plane frequency change rate.
3. according to claim 2ly extract rake thorn based on fishing boat accommodation data and fish for the method for state, it is characterized in that, the accommodation point data of each for fishing boat towing rake thorn ship whole year is divided into groups by speed of a ship or plane interval 0.1m/s.
4. according to claim 1ly extract rake thorn based on fishing boat accommodation data and fish for the method for state, it is characterized in that, in described step (4), accumulative towing time of a rake thorn ship a period of time or mileage are used
calculate, wherein, Z
icumulative time or the mileage of towing rake thorn in a period of time, P
i,j, P
i, j-1be time or the position of two adjacent accommodation points, i is certain towing rake thorn, j is towing rake thorn sum, p is that certain once pulls certain towpoint in rake thorn, n is that certain once pulls the sum of towpoint in rake thorn; First time summation is cumulative time or the mileage of a rake thorn towing, and second time summation is accumulative fishing time or the mileage of a period of time multiple towing rake thorn.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105279702A (en) * | 2015-09-23 | 2016-01-27 | 中国水产科学研究院东海水产研究所 | Trawl fishing accumulated value obtaining method based on Beidou satellite data |
| CN110377634A (en) * | 2019-06-24 | 2019-10-25 | 中国水产科学研究院东海水产研究所 | A kind of inshore fishing fishing boat goes to sea the time and voyage carries out quantitative analysis method |
| CN112801807A (en) * | 2020-12-25 | 2021-05-14 | 中国水产科学研究院东海水产研究所 | Squid fishing ground fishing intensity spatial information extraction method |
Citations (1)
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| CN101866157A (en) * | 2009-04-20 | 2010-10-20 | 中国水产科学研究院东海水产研究所 | Ship track recording and monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101866157A (en) * | 2009-04-20 | 2010-10-20 | 中国水产科学研究院东海水产研究所 | Ship track recording and monitoring method |
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| Title |
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| 张胜茂等: "北斗船位数据提取拖网捕捞努力量算法研究", 《水产学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105279702A (en) * | 2015-09-23 | 2016-01-27 | 中国水产科学研究院东海水产研究所 | Trawl fishing accumulated value obtaining method based on Beidou satellite data |
| CN110377634A (en) * | 2019-06-24 | 2019-10-25 | 中国水产科学研究院东海水产研究所 | A kind of inshore fishing fishing boat goes to sea the time and voyage carries out quantitative analysis method |
| CN112801807A (en) * | 2020-12-25 | 2021-05-14 | 中国水产科学研究院东海水产研究所 | Squid fishing ground fishing intensity spatial information extraction method |
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