Electronic chart data conversion device and electronic chart data conversion method

Abstract

The invention provides an electronic chart data conversion device and an electronic chart data conversion method. The electronic chart data conversion device comprises a data reading unit, a data conversion unit, a data storage unit and a display unit, wherein the data reading unit is used for reading original electronic chart data in a source file, the data conversion unit is used for reconstructing and projecting the original electronic chart data, the data storage unit is used for storing the reconstructed and projected electronic chart data into the electronic chart data with a user-defined format, and the display unit is used for reading the electronic chart data with the user-defined format and drawing and displaying a chart according to the read electronic chart data. According to the technical scheme, the reconstructing and projecting processes which consume a central processing unit (CPU) are simplified so as to reduce the occupation of the CPU and the use of storage space, the chart is displayed stably and display speed is fast on the basis that the precision of the chart data is guaranteed to the greatest extent.

Description

technical field [0001] The invention belongs to the field of computer technology. Specifically, it relates to an electronic chart data conversion device and an electronic chart data conversion method. Background technique [0002] While paper nautical charts play a huge role in navigation, their shortcomings such as single information and difficulty in carrying are also displayed. Electronic nautical charts make up for the shortcomings of paper nautical charts to a certain extent. [0003] The development of electronic charts has roughly gone through three stages: [0004] (1) Electronic reproduction stage of paper charts [0005] After digitizing paper charts all over the world, people store them on disks, and then use display devices and plotting instruments to perform chart operations as on paper charts. [0006] (2) Function expansion stage [0007] Through the use of digital nautical charts, people have found that it has many potential functions, such as displaying...

AI Technical Summary

Problems solved by technology

(7) ENCs of the same scale can overlap each other geographically, but the content of the overlapping area can only appear in one data set

[0016] The disadvantage of the method of directly displaying the electronic chart data without any conversion: this method directly reconstructs the data such as points, lines, and planes in the electronic chart data, and then converts them to screen coordinates after projection. Draw the chart on the display terminal and display it

Due to the complex calculation of the reconstruction and projection process, it will take up a lot of CPU

These disadvantages lead to slow switching and display of charts, and operations on charts can easily cause system paralysis; operations such as adding, deleting, modifying, and querying charts take a long time, and the system is unstable

[0017] Based on SENC's electronic chart data conversion, this solution saves the reconstruction process, so the CPU usage is reduced, but the space occupation of the reconstructed point, line and surface information will increase by nearly 100%.

[0018] Half-grid and half-vector nautical chart data processing scheme Since the raster nautical chart is stored after scanning the existing paper nautical chart, it occupies a large space and cannot perform operations such as querying objects on the nautical chart

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