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Parallel-based global ocean mesoscale eddy rapid identification algorithm

A recognition algorithm and scale vortex technology, applied in computing, image data processing, instruments, etc., can solve problems such as large computational load, incorrect OW parameters, misjudgment, etc., to avoid multi-core structure, reduce the number of iterations, and improve recognition efficiency. Effect

Active Publication Date: 2018-03-09
OCEAN UNIV OF CHINA
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Problems solved by technology

The OW method defines the criteria from the physical properties of mesoscale vortices, which can better reveal the physical nature of mesoscale vortices, but it has obvious defects.
First, the Coriolis force tends to 0 near the equator, so the OW parameters calculated by SLA, Coriolis force and gravity acceleration are incorrect
Second, the W field will generate a lot of noise, which is often misjudged as a vortex
Third, the results obtained by different thresholds fluctuate greatly
[0008] When using the above methods for vortex identification, there will be a large amount of calculation and a low identification rate of mesoscale vortices, resulting in the inability to quickly identify large-area mesoscale eddies

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Embodiment Construction

[0021] The global ocean mesoscale vortex rapid identification method of the present invention (such as figure 2 shown), including the following steps:

[0022] (1) Perform high-pass filtering on the global sea level anomaly (SLA) data, and then divide the filtered global SLA image into several regions to obtain the SLA image data of multiple regions; the global SLA image is first processed with a radius of 5° ( latitudinal), 10° (longitudinal) high-pass filtering, and then divide the filtered image into 18 areas of the same size, and each area is divided into two parts: "inner block" ( figure 1 Middle A / B area) and "outer block" ( figure 1 Middle C area). The "outer block" is the overlapping part of two adjacent regions to avoid losing the vortex due to segmentation, so the size of the "outer block" should be larger than the maximum diameter of the mesoscale vortex, here it is set to 10°, and the size of the "inner block" is set to 50° (longitudinal) and 52° (latitudinal)....

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Abstract

The invention relates to a parallel-based global ocean mesoscale eddy rapid identification algorithm. The algorithm is based on day-average ocean dynamics field sea level anomaly (SLA) satellite altimeter data, firstly, the high-pass filtering processing of the data is carried out, then the world is divided into several regions, and each region has an overlapped region with a surrounding area. Eddy seed points in each area are identified and an SLA contour is generated, the SLA contour is iterated, and whether an eddy boundary condition is satisfied is judged and the eddy identification is carried out. Based on parallel computing, the eddy identification of multiple regions is carried out at the same time, after the eddy identification of all regions is completed, eddy identification results are merged, repeated eddies of overlapped regions of the adjacent regions are eliminated, and thus the identification of global ocean mesoscale eddies is realized.

Description

technical field [0001] The invention belongs to the field of ocean visualization, and in particular relates to a parallel-based global ocean mesoscale eddy fast identification algorithm. Background technique [0002] Since the 1970s, the research on mesoscale eddies has increasingly become a focus and focus of physical oceanographers. Since the mesoscale vortex can cause changes in the vertical positions of thermoclines and haloclines, it has high research value and significance in both theoretical research such as ocean dynamics and practical applications such as national defense and military affairs. [0003] There are many methods for identifying and extracting oceanic mesoscale vortices. Currently, common eddy identification methods include SeaSurface Height (SSH) method, Okubo-Weiss (OW) method, Vector Geometry (VG) method, and Hybrid Detection (HD) method. [0004] (1) SSH method: This method takes the closed contour of the outermost circle as the vortex boundary, and...

Claims

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Application Information

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IPC IPC(8): G06T7/60
CPCG06T2207/20024Y02A90/10
Inventor 田丰林刘颖洁陈戈
Owner OCEAN UNIV OF CHINA
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