KR20140058702A - Method for enhancement of oil spill detectability using remote sensing technique - Google Patents

Abstract

The present invention relates to an oil spill monitoring method capable of enhancing oil spill monitoring reliability and, more specifically, to an oil spill monitoring method capable of preventing a false alarm for oil spill from being sent, by making a scatter modeling table through a simulation in advance, and comparing remote exploration material result with the scatter modeling table to enhance the oil spill monitoring reliability, in monitoring oil spill on the sea through a remote exploration technology.

Description

Technical Field [0001] The present invention relates to an oil spill detection method for improving oil spill monitoring using remote sensing data,

More particularly, the present invention relates to a method for monitoring an oil spill using a remote sensing technique, and a spawning modeling table is created in advance by simulating the oil spill, And comparing the result with the scattering modeling table to improve the reliability of oil spill monitoring, thereby preventing a false alarm from being sent.

Generally, a ship is equipped with an oil tank for storing and supplying fuel because it is propelled by the power of the engine engine. When such a ship hits a reef or collides with another ship, the oil tank is damaged, It is possible to leak out to the outside. Such oil spills cause serious problems such as polluting the oceans, destroying marine ecosystems, depleting offshore resources and causing the death of aquaculture fish. In particular, in the case of large vessels and oil tankers, the above problems are more serious .

Therefore, in order to reduce the marine pollution caused by the oil spill, the oil fence is generally installed to suppress the spread of oil, and the oil is decomposed and precipitated by the emulsifier. In order to carry out these measures and to predict the oil spill area, we need to determine the oil spill area of the ocean.

As a method for determining the oil spill range of the ocean, a method of directly reading and distinguishing the color of general seawater and the color of seawater in an oil spill area using optical image photographs taken from an airplane or a satellite is used have. However, there are few systems that have been put to practical use due to constraints such as observation areas and weather conditions. In order to overcome these shortcomings, developed countries such as Europe are adopting active remote sensing technique to build and operate a maritime surveillance system.

However, when oil information and alarms are issued using only satellite information, many errors are caused by various phenomena occurring in ocean weather and sea level.

Particularly, in the case of seawater having a light oil band, it is often difficult or difficult to distinguish it from general sea water. Moreover, since the distinction between seawater discharged from oil and general seawater is made by naked eye, And because the range of oil spill is roughly read by reading the color of seawater, accurate range can not be derived, and measures for oil spill are implemented in anticipation of the approximate range of oil spill.

Therefore, in recent years, a method of monitoring the oil spill using remote sensing data through satellites has been used to overcome such problems. In this method, the propagation characteristics of the corresponding region are received through the satellite, the propagation characteristics of the region are analyzed, and it is determined whether or not the oil outflow has occurred in the corresponding region. If the oil outflow is judged to occur, It uses the sending method.

On the other hand, in the method of monitoring the oil spill using the remote sensing data, there is a problem that the frequency of the false alarm reporting that oil spill occurs is very frequent even though it is not actually an oil spill.

In addition, the method of monitoring the oil spill using remote sensing data is to monitor the oil spill using the propagation characteristics of the corresponding region through the satellite, and the propagation characteristics are not only changed by the characteristics of the spilled oil, Because of the many other variables besides oil, other parameters, such as wind and fog, may be found to have the same propagation characteristics as oil spillage, even though it is not actually a band of oil.

The present invention relates to a technique for minimizing the frequency of false alarms when oil spills are monitored using remote sensing data. Technical findings of oil spill monitoring methods for improving oil spill monitoring reliability using remote sensing data Thereby completing the present invention.

Accordingly, it is an object of the present invention to provide a method and system for estimating oil spill monitoring reliability using remote sensing data, which can improve the reliability of oil spill monitoring by creating a scattering modeling table through simulation and comparing remote sensing data with the scattering modeling table Thereby increasing the oil leakage.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides an oil leakage monitoring method for monitoring an oil spill in the sea, comprising the steps of: detecting radar frequency, radar polarization, and propagation characteristic information including a back scattering coefficient on the sea surface according to an incident angle; A first step of setting propagation characteristic information in a sea in which the oil flows out to a scattering modeling table which is a numerical analytical theory model; A second step of receiving, from a satellite radar, image information of an observation area actually observed by a satellite radar at a specific time and observation characteristic information which is a propagation characteristic of the image information; And an analysis unit for comparing the propagation characteristic information on the scattering modeling table with the observation characteristic information to derive an oil leaking condition and an oil leaking candidate area in the observation area and generating an oil leaking alarm when the oil leaking candidate area is derived And a third step of monitoring the oil spill.

In a preferred embodiment of the present invention, after a predetermined time elapses from the specific time, image information and observation characteristic information re-received from the satellite radar are compared with the propagation characteristic information to derive an oil leaking condition in the observation area, And a fourth step of informing that the oil leakage alarm is false if the oil is derived from the observation area through the oil particle tracking method.

In a preferred embodiment, the scattering modeling table generates an irregular sea surface having a high dielectric constant and an oil layer having a low dielectric constant located on the sea surface, and calculates a roughness of the sea surface, a thickness of the oil layer, Layer radar frequency, radar frequency of satellite radar, radar polarization of satellite radar, and incident angle of satellite radar are set to different values, and the radar backscattering factor for various oil spills is calculated.

In a preferred embodiment of the present invention, the third step includes calculating a radar frequency, a radar polarized wave, an incident angle, and a back scattering coefficient in the scattering modeling table with a radar frequency, a radar polarization, an incident angle, And a value within a predetermined threshold value is matched.

The present invention has the following excellent effects.

First, according to the oil spill monitoring according to an embodiment of the present invention, a scattering modeling table is created by simulation in advance, and the reliability of the oil spill monitoring can be improved by comparing the remote sensing data with the scattering modeling table Effect can be obtained.

In addition, according to the oil spill monitoring according to the embodiment of the present invention, even if an alarm that an oil spill occurs once is sent, the process of comparing the remote sensing data and the scattering modeling table after a predetermined time is repeated, It is possible to obtain an effect of once more improving the reliability of monitoring.

1 is a flowchart showing an oil spill monitoring method according to an embodiment of the present invention;

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

Also, the oil leakage monitoring method according to an embodiment of the present invention generates a scattering modeling table substantially including propagation characteristic information on a computer, and transmits radio wave characteristic information on the scattering modeling table and observation characteristic information received from the satellite radar Lt; / RTI >

In addition, the program may be a program in which a program command, a local data file, a local data structure or the like is composed solely or in combination, and may be a program code that can be executed by a computer using an interpreter or the like It can be a program written in a high-level language code.

In addition, the program is stored in a computer-readable medium and is read by a computer to perform the functions. The medium may be specifically designed or configured for the present invention, or may be stored in a computer- Optical recording media such as CD and DVD, magneto-optical recording media which can also serve as magnetic and optical recording media, magnetic recording media such as ROM, RAM, and optical recording media. , Flash memory, or the like, or a hardware device specially configured to store and execute program instructions by a combination thereof.

In addition, the program may be stored in a server system capable of transmitting information through a communication network such as an intranet or the Internet, and may be transmitted to a computer, as well as being read by a computer by the medium. A computer can access the server system without sending it to a computer and provide a platform for executing the program on the server system.

FIG. 1 is a flowchart illustrating an oil spill monitoring method according to an embodiment of the present invention.

Referring to FIG. 1, an oil leakage monitoring method according to an embodiment of the present invention is for monitoring an oil leakage in the sea, and more particularly, to an oil leakage area, And the like.

Also, in the oil spill monitoring method according to an embodiment of the present invention, first, a scattering modeling table is generated. Here, the scattering modeling table is generated by a numerical analytical theory model of electromagnetic wave scattering on the sea surface from which oil flows out, and calculates the back scattering coefficient of the satellite radar by the outflowed oil.

Also, the scattering modeling table sets the backscattering factor on the sea surface according to the radar frequency, radar polarization, and incident angle of the satellite radar as a variable having a plurality of values, and calculates a scattering model for the oil spill area having various aspects For example, the scattering modeling table may be a database table that is simulated in advance by applying the radar frequency, the radar polarization, and the incident angle as different variables and calculating the rear scattering coefficient. Here, the radar frequency, the radar polarization, the incident angle, and the back scattering coefficient may be defined as propagation characteristics information for the satellite radar.

Specifically, the scattering modeling table generates an irregular sea surface having a high dielectric constant and an oil layer having a low dielectric constant located on the sea surface, and calculates a roughness of the sea surface, a thickness of the oil layer, , Radar frequency of satellite radar, radar polarization of satellite radar, and incident angle of satellite radar are set to different values, and radar backscattering factor for various oil spill sea is calculated.

At this time, when mathematical calculation is performed to generate the scattering modeling table, the number of backscattering coefficients can be derived using various numerical analysis methods (S1000).

Next, the satellite radar receives the remote observation data actually observed at a specific time, and the remote observation data includes image information for the observation area, which is an area actually observed by the satellite radar, and observation characteristics Information.

The observation characteristic information may include a radar frequency of the satellite radar, a radar polarization of the satellite radar, an incident angle of the satellite radar, and a back scattering coefficient of the sea surface according to the incident angle, The difference is that it is actually observed information.

In addition, the satellite radar may be variously provided, but it may be provided with a synthetic aperture radar (SAR), and the image information actually observed in the satellite radar may be a SAR image (S2000).

Next, an oil outflow alarm is generated according to whether or not the oil radiated from the observation area observed by the satellite radar. The oil outflow in the observation area is determined by comparing the observation characteristic information with the propagation characteristic information on the scattering modeling table .

Here, it is compared whether the observation characteristic information for each pixel on the image information of the satellite radar has a similar value with the propagation characteristic information on the scattering modeling table within a predetermined threshold value. On the other hand, the observation characteristic information of the specific coordinates actually observed by the satellite radar may be compared with the propagation characteristic information.

When the observation characteristic information is compared with the propagation characteristic information, the radar frequency, the radar polarization, the incident angle and the back scattering coefficient in the scattering modeling table, the radar frequency, the radar polarization, Can be compared with each other in a matching manner. In another method of comparing the observation characteristic information and the propagation characteristic information, the respective back scattering coefficient numbers may be matched and compared.

In addition, when comparing the observation characteristic information with the propagation characteristic information, predetermined regions from which the oil flows out are extracted as the oil spill candidate region. When the oil spill candidate region is derived, a variety of weather information and ocean current information It is also possible to obtain more information by matching it.

Therefore, by comparing the observation characteristic information as the remote monitoring data with the propagation characteristic information as the simulated information to derive the oil leakage candidate region, it is possible to accurately detect the oil leakage region, Reliability can be improved.

In addition, when the oil spill candidate region is derived, it is generated as an oil spill alert, and the oil spill alert can be transmitted to a predetermined management agency capable of responding to the oil spill at sea (S3000).

Next, the observation characteristic information and the propagation characteristic information for the observation area are compared again. The image information and the observation characteristic information for the observation area are measured after a predetermined time period.

Also, the image information and the observation characteristic information measured after the predetermined time with respect to the observation area from the satellite radar are re-received and are compared with the propagation characteristic information on the scattering modeling table, And the oil spill candidate region. At this time, it is possible to determine whether the oil has flowed or moved through the observation area through the oil particle tracking method.

In addition, when the oil spill candidate region is derived by variables other than oil such as wind or fog, it is deduced that the oil does not leak out when the oil spill is judged after a predetermined time.

If the oil spill candidate region is derived at the specific time but the oil does not leak out from the observation area after a predetermined time at the specific time or the oil spill candidate region is not derived, And informs the predetermined management agency of the alarm (S4000).

Therefore, the reliability of the oil spill monitoring can be improved by repeating the process of comparing the remote sensing data and the scattering modeling table after a predetermined time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the present invention. Various changes and modifications will be possible.

Claims (4)

As an oil spill monitoring method that monitors oil spills at sea,
The propagation characteristics information including the radar frequency of the satellite radar, the radar polarization, and the backscattering coefficient on the sea surface according to the incident angle is set as a variable having a plurality of values, and the propagation characteristic information in the oil- A scattering modeling table which is a theoretical model;
A second step of receiving, from a satellite radar, image information of an observation area actually observed by a satellite radar at a specific time and observation characteristic information which is a propagation characteristic of the image information; And
Wherein the control unit compares the propagation characteristic information on the scattering modeling table with the observation characteristic information to derive an oil outflow candidate region and an oil outflow candidate region in the observation region and to generate an oil outflow candidate region when the oil outflow candidate region is derived, 3. A method of monitoring an oil spill comprising:.
The method according to claim 1,
After a predetermined time elapses from the specific time, the image information and the observation characteristic information re-received from the satellite radar are compared with the propagation characteristic information to derive an oil leakage in the observation area again. Further comprising: a fourth step of informing that the oil leakage alarm is a false alarm when the oil is not discharged or moved in the observation area.
3. The method of claim 2,
In the scattering modeling table,
Wherein the surface roughness of the sea surface, the thickness of the oil layer, the dielectric constant of the oil layer, the radar frequency of the satellite radar, the radar frequency of the satellite radar, Wherein the radar polarization and the incident angle of the satellite radar are set to different values, and the radar backscattering factor for the various outflow oil spills is calculated.
3. The method of claim 2,
The third step is to match the radar frequency, the radar polarization, the incident angle, and the backscattering factor in the scattering modeling table with the radar frequency, the radar polarization, the incident angle, and the backscattering factor in the observation characteristic information, Value of the oil spill is compared.

Images