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A terminator time sea fog detection algorithm based on Himawari-8 satellite data

A detection algorithm and satellite data technology, which is applied in computing, computer components, instruments, etc., can solve the problems that the sea fog detection algorithm is not suitable and cannot cope with the rapid changes in the radiation amount of ground objects at dawn and dusk, and achieve the effect of improving the extraction accuracy

Inactive Publication Date: 2019-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006] The present invention provides a sea fog detection algorithm based on Himawari-8 satellite data at dawn and dusk, aiming at sea fog and low cloud spectral features similar, fixed thresholds cannot cope with rapid changes in ground object radiation at dawn and dusk, and sea fog detection at day and night None of the algorithms are suitable for the detection of sea fog at dawn and dusk. This method realizes the detection of sea fog at dawn and dusk by combining object-oriented image segmentation and setting dynamic thresholds for some judgment conditions.

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  • A terminator time sea fog detection algorithm based on Himawari-8 satellite data
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  • A terminator time sea fog detection algorithm based on Himawari-8 satellite data

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[0032] In order to make the purpose, content and advantages of the present invention clearer, the implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples:

[0033] refer to figure 1 , the specific implementation steps of the present invention are:

[0034] (1) Preprocess the Himawari-8 satellite data to obtain the solar zenith angle data and image data at dawn and dusk. Preprocessing includes: geometric correction, land masking, determining the relationship between sea fog, sea surface albedo and solar zenith angle. The solar zenith angle at dawn and dusk ranges from 60° to 85°. The expression of the relationship between the reflectivity of the sea fog and sea surface and the solar zenith angle is shown in Table 1:

[0035] Table 1

[0036] sea ​​fog

sea ​​table

the y 1 : Ref=-0.00885×SOZ+0.808

Y 1 : Ref=-0.004×SOZ+0.381

the y 2 : Ref=-0.0085×SOZ+0.773 ...

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Abstract

The invention discloses a terminator time sea fog detection algorithm based on Himawari-8 satellite data, and relates to the technical field of new generation static satellite data application. The method comprises the following steps of preprocessing Himawari-8 data to obtain the sea area data at a terminator moment; removing the medium-high cloud and low cloud through image segmentation; settinga brightness temperature threshold of a far infrared band to remove missing middle and high clouds; extracting a sensitive wave band, constructing a judgment index to form a judgment condition, setting a corresponding threshold value to remove a sea surface, and finally obtaining a sea fog recognition result. According to the method, the change characteristics of the ground object at the terminator moment and the spectral similarity characteristics of sea fog and low cloud are comprehensively considered, sea fog detection at the terminator moment can be achieved through combination of image segmentation and the judgment threshold value of the set judgment condition, and a foundation is provided for sea fog detection all day long.

Description

Technical field: [0001] The invention relates to the technical field of application of geostationary satellite data, in particular to the field of sea fog detection at dawn and dusk based on geostationary satellite data. Background technique [0002] As a kind of disastrous weather, sea fog will seriously affect economic operations such as marine transportation, oil exploration, fishing and fishing, and even threaten the lives of relevant operators. However, the current detection of sea fog is mostly concentrated during the day or night, and the dawn and dusk as the initial stage of sea fog are very important for understanding the law of sea fog generation and disappearance. Therefore, the detection of sea fog at dawn and dusk can not only realize the all-day detection of sea fog in combination with the detection of sea fog during the day and night, but also provide reliable data support for sea fog forecast research. [0003] Traditional sea fog detection mainly relies on ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06K9/34
Inventor 万剑华蒋莉刘善伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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