A flow direction feature-oriented ocean current vector field visualization method based on angle tracking

Abstract

The invention relates to a flow direction feature-oriented ocean current vector field visualization method based on angle tracking, which comprises the following steps: separating flow direction feature data concerned by a user from the whole ocean current vector field data by adopting a 3 * 3 window angle tracking technology, and dynamically superposing the flow direction feature data into oceanlarge environment basic background data in a network environment for visualization. The method comprises the steps that firstly, a network service system background program carries out 3 * 3 window angle forward tracking and reverse tracking on received ocean current vector field data to extract a flow line; and then the extracted flow line data is sent back to a front-end program of the network service system in a WKT message format, and finally the front-end program of the network service system maps and draws the flow line data and dynamically overlaps the flow line data to basic backgrounddata of the marine large environment for display.

Description

technical field [0001] The invention belongs to the field of marine geographic information system visualization research, and relates to a flow direction feature-oriented ocean current vector field visualization method based on angle tracking. Background technique [0002] The visualization of ocean current vector field is an important part of the visualization research of marine geographic information system. The research and analysis of the flow direction characteristics of ocean current vector field is of great significance to fishery, shipping, sewage discharge and military affairs. The existing vector field visualization methods mainly include direct visualization, geometric visualization, texture visualization and feature visualization. The direct visualization method is to draw arrows or other icons on the sampling points to describe the entire vector field. For example, in 2013, Wei Baoquan et al. published "GIS-Based Dynamic Visualization of Flow Field in the Changh...

AI Technical Summary

Problems solved by technology

Feature visualization methods are computationally complex and heavily dependent on the applied domain

[0003] In order to separate the flow direction feature data that the user cares about from the huge amount of vector field data, and avoid problems such as dense graphics generated due to the large amount of data in the limited screen range of the computer, the present invention proposes a flow direction feature-based The ocean current vector field visualization method based on angle tracking, according to the deflection angle of the vector, adopts the 3×3 window angle tracking technology to extract the flow direction characteristics of the entire ocean current vector field, and dynamically superimposes it on the basic background data of the marine environment for display

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