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Method for improving display speed of ship motion tracks on electronic navigation chart client

A technology of ship movement and electronic chart, applied in the direction of measuring devices, instruments, surveying and navigation, etc., can solve the problems of long download time client display processing time, large amount of ship track data, difficulty, etc., to ensure downloading and Effect of display speed, improved user-friendliness

Inactive Publication Date: 2010-06-09
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In these systems, when the user client requests to superimpose the ship’s trajectory on the electronic chart, especially when requesting to superimpose the ship’s trajectory data for a long period of time, there is a common problem: due to the large amount of ship trajectory data, Requires long download time and client display processing time
[0003] How to quickly display a large amount of ship trajectory data on the electronic chart client while maintaining a low degree of distortion is still a valuable but difficult problem

Method used

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  • Method for improving display speed of ship motion tracks on electronic navigation chart client
  • Method for improving display speed of ship motion tracks on electronic navigation chart client
  • Method for improving display speed of ship motion tracks on electronic navigation chart client

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Embodiment Construction

[0033] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0034] The principle of the present invention is to use vector data compression method to preprocess the ship motion track data, and assign a display scale range mark to each ship position point. The smaller the display scale, the fewer corresponding ship position points. The selected vector data compression method should ensure that the key position points of the ship's trajectory can be preserved in the case of a small display scale. When the display scale of the electronic chart client is small, it only downloads and superimposes the current chart from the server to display the ship track outline information within the geographical range or within the appropriate zoom range. When the user increases the scale of the electronic chart, it will ...

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Abstract

The invention discloses a method for improving the display speed of ship motion tracks on an electronic navigation chart client. The method comprises the steps of: dividing a display scale of an electronic navigation chart into different levels, wherein each level corresponds to one display scale range; presetting a data compression threshold for each display scale level; utilizing a vector data compression method to mark the display scale level for each position point in the ship motion track, wherein a scale is larger and corresponding ship motion track points are more; and only downloading data of the ship motion track points which are positioned in the geographical range displayed by the navigation chart of the client or the properly amplified range and correspond to the display scale of the navigation chart of the client from a server and displaying the data by the client. Through the method, when a user performs the display of the ship motion tracks on the electronic navigation chart client, only a less amount of ship track data is downloaded and displayed, which can effectively improve the download and display speed of the ship track data.

Description

Technical field: [0001] The invention relates to a method for dynamic monitoring and playback of a remote ship, in particular to a method for increasing the display speed of a ship's motion track on an electronic chart client. Background technique: [0002] Superimposing and displaying the ship's trajectory on the electronic chart can enable users to analyze ship accidents more intuitively and grasp the historical dynamics of the ship. Since the ship dynamic management system based on the client and server structure (C / S) and the browser and server structure (B / S) has the advantages of convenient installation and maintenance, support for concurrent access by multiple users, and centralized data management, etc., it is becoming more and more popular. It is more and more widely used in maritime security departments and shipping companies. In these systems, when the user client requests to superimpose the ship’s trajectory on the electronic chart, especially when requesting to...

Claims

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Application Information

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IPC IPC(8): G01C21/00
Inventor 胡勤友杨春孟良施朝健
Owner SHANGHAI MARITIME UNIVERSITY
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