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Electronic chart displaying method and system

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

Active Publication Date: 2015-07-15
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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  • Electronic chart displaying method and system
  • Electronic chart displaying method and system
  • Electronic chart displaying method and system

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Embodiment Construction

[0067] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0068] The present invention reads the original chart data through the memory mapping technology, and analyzes the read original chart data according to the S-57 standard of the IHO (International Hydrographic Organization, International Hydrographic Organization), so as to obtain the chart conforming to the S-57 standard. Electronic chart data. The obtained electronic chart data is converted from geographic coordinates to plane coordinate system through Mercator projection, so that 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 t...

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PUM

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Abstract

The invention relates to the field of electronic chart graph processing, in particular to an electronic chart displaying method and system. According to the electronic chart displaying method, an electronic chart area needing to be displayed is located through a rectangular cutting window; objects wholly outside the cutting window and portions, outside the cutting window, of objects partially in the cutting window are cut out in an electronic chart traversing mode; only portions in the cutting window are reserved; the objects are loaded into a memory bitmap; and finally the objects are displayed on a screen in a memory bitmap mode. Thus, the data volume loaded into internal storage is greatly reduced, and the electronic chart displaying speed is improved.

Description

technical field [0001] The invention relates to the field of electronic chart graphics processing, in particular to an electronic chart display method and system. Background technique [0002] Under the background 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 weather, ocean currents, pirates and other information, and can provide convenient query functions. With the help of navigation equipment, it can also conveniently carry out route design, route monitoring, route alarm and navigation. Appearing reefs or strange 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 have high requirements for hardware equipment, difficult maintenance, high power consumption, and low flexibility, a...

Claims

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Application Information

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IPC IPC(8): G06F3/14
CPCG06F3/14
Inventor 王娜徐韬郭强
Owner SHENZHEN UNIV
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