CN103455804B - Satellite fire point distinguishing method for electric transmission line forest fire based on dynamic threshold - Google Patents

Satellite fire point distinguishing method for electric transmission line forest fire based on dynamic threshold Download PDF

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Publication number
CN103455804B
CN103455804B CN201310421175.5A CN201310421175A CN103455804B CN 103455804 B CN103455804 B CN 103455804B CN 201310421175 A CN201310421175 A CN 201310421175A CN 103455804 B CN103455804 B CN 103455804B
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China
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transmission line
fire
fire point
passage
modis
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CN201310421175.5A
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Chinese (zh)
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CN103455804A (en
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陆佳政
徐勋建
张红先
李波
方针
赵纯
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国家电网公司
国网湖南省电力公司
国网湖南省电力公司电力科学研究院
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Priority to CN201310421175.5A priority Critical patent/CN103455804B/en
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Abstract

The invention discloses an electric transmission line forest fire satellite fire point distinguishing method based on a dynamic threshold. The method comprises the following steps of receiving MODIS infrared satellite data, generating a three-channel composite picture, determining and distinguishing open flame fire points, determining and distinguishing fire points through a dynamic threshold method, removing industrial and urban fire point information, removing fire point information beyond a 5km distance range of an electric transmission line, and obtaining forest fire point information of the electric transmission line. The method eliminates side effects on fire point recognition in different seasons and different moments, eliminates effects of different areas on the fire point recognition, improves the accuracy of the fire point recognition of the electric transmission line, can timely publish electric transmission line forest fire alarm information to enable people to take measures in advance and reduces the power grid loss caused by forest fire to the maximum limit.

Description

A kind of electric transmission line forest fire satellite fire point discrimination method based on dynamic threshold
Technical field
The invention belongs to electrical engineering technical field, relate to a kind of electric transmission line forest fire satellite fire point discrimination method based on dynamic threshold, be applicable to automatic, the discrimination method fast and accurately of mountain fire near transmission line of electricity.
Background technology
In recent years, along with global warming, extreme climate weather frequently occurs, and China ALFISOL IN CENTRAL, between spring ploughing and lucid interval, more and more easily continuous high temperature sunny weather occurs.Simultaneously due to economic development, rural area fuel by traditional withered grass and trees by combustion gas is substituted, add the enforcement of multi-line regression model, vegetation keeps more and more intact to area, mountain area, so, near transmission line of electricity, mountain fire frequency presents a rapidly rising trend, and the number of times that tripping operation occurs because of mountain fire also obviously increases.Even if extra high voltage line, as Shanxi Chang Nan line, also once there is mountain fire trip accident, the safe and stable operation of serious threat electrical network.And traditional electric transmission line forest fire satellite fire point monitoring, general employing absolute threshold method, namely as the infrared channel MODIS in infrared monitoring satellite, (abbreviation of English full name " moderate-resolution imaging spectroradiometer ", Chinese translation is " Moderate Imaging Spectroradiomete ".) series of satellites is generally when the 21st passage is greater than certain absolute threshold and is judged as fiery point, there is following defect in the method: (1), easily by the impact of cloud layer, bare area and the water surface, causes the erroneous judgement of fire point; (2) easily by the impact of seasonal variations, surface temperature change, the erroneous judgement of fire point is caused; (3) easily affect by urban heat land effect, cause the erroneous judgement of fire point.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of prior art, a kind of electric transmission line forest fire satellite fire point discrimination method based on dynamic threshold is provided, use the method can automatically, the fire satellite fire point of identification transmission line forest fire quickly and accurately, farthest avoid erroneous judgement, thus transmission line forest fire alarm can be issued in time, instruct the mountain fire preventing and controlling near transmission line of electricity, avoid the transmission line of electricity trip accident because mountain fire occurs, ensure power network safety operation.
Technical scheme of the present invention is, a kind of electric transmission line forest fire satellite fire point discrimination method based on dynamic threshold provided, first system synthesizes RGB picture according to the 7th passage of MODIS infrared satellite Monitoring Data, the 2nd passage, the 1st passage, and the qualitative identification of the bright red spot utilizing picture to show fires a little.Then to utilize in the 21st channel value of all fiery dot informations minimum value as threshold value, recycling threshold method Quantitative fires concrete coordinate a little and burnt area, according to transmission line of electricity geographic information data, reject the fire point and the extraneous fiery point of transmission line of electricity 5km along the line that are positioned at manufacturing district and city, obtain transmission line forest fire fire dot information.Specifically, the method comprises the steps:
(1), receive MODIS infrared satellite data: MODIS infrared satellite receiving trap is set, utilizes this device to receive the Monitoring Data of MODIS infrared satellite, be i.e. the data of 36 passages altogether that contain of each pixel of MODIS infrared satellite;
(2), triple channel synthesising picture is generated: the 7th passage of MODIS infrared satellite step (1) received is given red, 2nd passage is given green, 1st passage is given blue, use conventional method, will the 7th red passage 2nd passage green with imparting be given, give the 1st blue passage generation Three Channel Color synthesising picture;
(3), the qualitative identification of naked light fire point: on the triple channel synthesising picture that step (2) generates, find out the red pixel of the naked light fire point that all expressions are being burnt.Conventional method is used to calculate the minimum value T of the 21st channel value of all red pixels 0.This minimum value T 0for dynamic change value.Different regions, Various Seasonal and not in the same time, minimum value T 0difference, but be presented on triple channel synthesising picture, be bright red spot;
(4), dynamic thresholding method fire point Quantitative: utilize the dynamic minimum value T acquired by step (3) 0as the dynamic threshold of the 21st passage, in discriminating step (3), the bright red spot be presented on triple channel synthesising picture is naked light fire point, and exportable fire point geographic coordinate and fire point area, this fire point area is directly proportional with the fire point pixel number be connected;
(5) industry and city fire dot information, is rejected: in the MODIS infrared satellite data that step (1) receives, find out the industry in transmission line of electricity Geographic Information System and urban geographic information coordinate, utilize this coordinate to reject the fiery dot information dropped within manufacturing district and metropolitan district;
(6) the fiery dot information outside transmission line of electricity 5km along the line distance range, is rejected: in the MODIS infrared satellite data that step (1) receives, find out transmission line of electricity Geographic Information System, utilize the 220kV in this system and the above geography information along 5km place, transmission line of electricity both sides, reject the fiery dot information of transmission line of electricity along both side outside 5km distance range;
(7), draw transmission line forest fire fire dot information: check step (5) ~ (6) institute ember dot information, namely draw the potential risk transmission line forest fire fire dot information affecting transmission line of electricity safe and stable operation.
The invention has the beneficial effects as follows:
1, utilize the 21st passage minimum value of the red pixel of triple channel synthesising picture, ingeniously eliminate Various Seasonal and not in the same time to the adverse effect of fire point identification;
2, utilize transmission line of electricity Geographic Information System (GIS) data, effectively eliminate the impact of different regions on the identification of fire point;
3, transmission line of electricity forest fire accuracy rate is substantially increased;
4, a difficult problem for transmission line forest fire fire point monitoring is solved.According to the transmission line of electricity fire point of monitoring out, transmission line forest fire warning information can be issued in time, before generation mountain fire tripping operation prerequisite, carry out counter-measure, reduce the loss that mountain fire causes to electrical network to greatest extent.
Embodiment
Embodiment 1:
(1), receive MODIS infrared satellite data: MODIS infrared satellite receiving trap is set, utilizes this device to receive the Monitoring Data of MODIS infrared satellite;
(2), triple channel synthesising picture is generated: the 7th passage of MODIS infrared satellite step (1) received, 2nd passage is given green, 1st passage is given blue, use conventional method, will the 7th red passage 2nd passage green with imparting be given, give the 1st blue passage generation Three Channel Color synthesising picture;
(3), the qualitative identification of naked light fire point: on the triple channel synthesising picture that step (2) generates, find out the red pixel of the naked light fire point that all expressions are being burnt.Conventional method is used to calculate the minimum value T of the 21st channel value of all red pixels 0;
(4), dynamic thresholding method fire point Quantitative: utilize the dynamic minimum value T acquired by step (3) 0as the dynamic threshold of the 21st passage, in discriminating step (3), the bright red spot be presented on triple channel synthesising picture is naked light fire point;
(5) industry and city fire dot information, is rejected: in the MODIS infrared satellite data that step (1) receives, find out the industry in transmission line of electricity Geographic Information System and urban geographic information coordinate, utilize this coordinate to reject the fiery dot information dropped within manufacturing district and metropolitan district;
(6) the fiery dot information outside transmission line of electricity 5km along the line distance range, is rejected: in the MODIS infrared satellite data that step (1) receives, find out transmission line of electricity Geographic Information System, utilize the 220kV in this system and the above geography information along 5km place, transmission line of electricity both sides, reject the fiery dot information of transmission line of electricity along both side outside 5km distance range;
(7), draw transmission line forest fire fire dot information: check step (5) ~ (6) institute ember dot information, namely draw the potential risk transmission line forest fire fire dot information affecting transmission line of electricity safe and stable operation.
Embodiment 2:
Step (1) ~ (3) are with embodiment 1;
(4), dynamic thresholding method fire point Quantitative: utilize the dynamic minimum value T acquired by step (3) 0as the bright red spot be presented in the dynamic threshold discriminating step (3) of the 21st passage on triple channel synthesising picture all for naked light fire point.Step leaves it at that.

Claims (1)

1., based on an electric transmission line forest fire satellite fire point discrimination method for dynamic threshold, the method comprises the steps:
(1), receive MODIS infrared satellite data: MODIS infrared satellite receiving trap is set, utilizes this device to receive the Monitoring Data of MODIS infrared satellite;
(2), triple channel synthesising picture: the 7th passage of MODIS infrared satellite step (1) received is given red, 2nd passage is given green, 1st passage is given blue, use conventional method, will the 7th red passage 2nd passage green with imparting be given, give the 1st blue passage generation Three Channel Color synthesising picture;
(3), the qualitative identification of naked light fire point: on the triple channel synthesising picture that step (2) generates, find out the red pixel of the naked light fire point that all expressions are being burnt, use conventional method to calculate the minimum value T of the 21st channel value of all red pixels 0;
(4), dynamic thresholding method fire point Quantitative: utilize the dynamic minimum value T acquired by step (3) 0as the dynamic threshold of the 21st passage, in discriminating step (3), the bright red spot be presented on triple channel synthesising picture is naked light fire point;
(5) industry and city fire dot information, is rejected: in the MODIS infrared satellite data that step (1) receives, find out the industry in transmission line of electricity Geographic Information System and urban geographic information coordinate, utilize this coordinate to reject the fiery dot information dropped within manufacturing district and metropolitan district;
(6) the fiery dot information outside transmission line of electricity 5km along the line distance range, is rejected: in the MODIS infrared satellite data that step (1) receives, find out transmission line of electricity Geographic Information System, utilize the 220kV in this system and the above geography information along 5km place, transmission line of electricity both sides, reject the fiery dot information of transmission line of electricity along both side outside 5km distance range;
(7), draw transmission line forest fire fire dot information: check step (5) ~ (6) institute ember dot information, namely draw the potential risk transmission line forest fire fire dot information affecting transmission line of electricity safe and stable operation.
CN201310421175.5A 2013-09-16 2013-09-16 Satellite fire point distinguishing method for electric transmission line forest fire based on dynamic threshold CN103455804B (en)

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CN103942912B (en) * 2014-05-09 2015-04-15 国家电网公司 Power transmission line mountain fire fine positioning method based on brightness temperature value analysis
CN104112327B (en) * 2014-07-09 2015-05-06 国家电网公司 Multi-pixel fire point correction method for power transmission line wildfire satellite monitoring
CN104236616B (en) * 2014-10-11 2015-08-19 国家电网公司 A kind of transmission line forest fire satellite monitoring system monitoring test method
CN104537792A (en) * 2014-12-26 2015-04-22 浙江大学 Transmission line wildfire satellite monitoring method based on background information
CN105740642B (en) * 2016-03-14 2018-11-13 国家电网公司 MODIS fire satellite fire point accuracy method of discrimination based on multi- source Remote Sensing Data data
CN105761408B (en) * 2016-04-25 2017-08-04 国网湖南省电力公司 The dynamic threshold monitoring method and system of transmission line forest fire satellite
CN106297142B (en) * 2016-08-17 2018-09-11 云南电网有限责任公司电力科学研究院 A kind of unmanned plane mountain fire exploration control method and system
CN109509319B (en) * 2018-12-29 2020-06-30 北京恒泰实达科技股份有限公司 Power transmission line forest fire monitoring and early warning method based on static satellite monitoring data

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