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A method and system for displaying an electronic chart

A technology of electronic chart and display method, which is applied in the direction of digital output to display equipment, etc., and can solve the problems of restricting the display speed of electronic charts and low performance of embedded systems

Active Publication Date: 2018-04-03
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the PC, the performance of the embedded system is lower, which restricts the display speed of the electronic chart, which has become an important factor restricting the development of the electronic chart system based on the embedded operating system.

Method used

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  • A method and system for displaying an electronic chart
  • A method and system for displaying an electronic chart
  • A method and system for displaying an electronic chart

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Embodiment Construction

[0067] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments.

[0068] The present invention reads the raw data of the nautical chart through the memory mapping technology, and analyzes the raw data of the read nautical chart according to the S-57 standard of IHO (International Hydrographic Organization), so as to obtain the electronic data conforming to the S-57 standard. Chart data. The obtained electronic chart data is converted from geographic coordinates to a plane coordinate system by Mercator projection. In this way, in the process of displaying electronic charts, there is no need to perform Mercator projection calculations, which can speed up the display. The data after Mercator projection is then imported into the color table, symbol library and conditional commands according to IHO's S-52 standard, a...

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PUM

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Abstract

The present invention relates to the field of pattern processing for electronic charts, and particularly to an electronic chart display method and system. The method of the present invention comprises: positioning an electronic chart region to be displayed using a rectangular cutting window; cutting out objects completely located outside the cutting window and the portions located outside the cutting window of objects partially located inside the cutting window in a manner of traversing an electronic chart, and only reserving the portions located inside the cutting window; then, loading objects in a memory bitmap; and finally, displaying same on a screen in a manner of the memory bitmap, thereby greatly reducing the data amount loaded in a memory, and improving the display speed of the electronic chart.

Description

Technical field [0001] The present invention relates to the field of electronic chart graphics processing, in particular to an electronic chart display method and system. Background technique [0002] In the context of the information age, electronic charts have gradually replaced paper charts and are widely used in the field of navigation. It can store and display a large amount of nautical chart data and information such as weather, ocean currents, pirates, etc., and can provide convenient query functions. With the help of navigation equipment, it can also conveniently perform route design, route monitoring, route alarm and navigation functions, targeting near ships The emergence of reefs or unfamiliar ships can also provide a voice alarm function, which has powerful functions that traditional paper charts do not have. [0003] At present, the most used electronic chart systems are based on PCs, which require high hardware equipment, difficult to maintain, high power consumption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/14
CPCG06F3/14
Inventor 王娜徐韬郭强
Owner SHENZHEN UNIV