电子海图文件的读取与显示程序开发

The Development of Electronic Chart File Read and Display

本文介绍了电子海图文件的显示以及读写程序的开发过程。首先分析电子海图文件格式结构(本项目采用的电子海图是与CAD文件相兼容的DXF格式),然后根据电子海图的格式及结构编写出读写电子海图的程序流程图,根据此流程图可以开发出电子海图读写程序。另外还介绍了电子海图在显示设备上显示时,大地坐标到设备显示坐标之间的转换方法。

This article describes the development process of the how to display and write of the electronic chart file. First analysis the structure of the electronic chart file format （electronic chart used in this project is compatible with DXF format）, and then prepared program flowchart according to the format and structure of the electronic chart. electronic chart reading and writing program can be developed according to this the flow chart. This article Also introduced the conversion method that geodetic coordinates to the device coordinate.