MapGIS明码文件的获取和在坐标转换中的应用研究

How to Get the Ascii Code Files of MapGIS and Use It in the Conversion of Coordinates

MapGIS是我国自主研发的大型地理信息系统软件平台,具有数字制图、空间分析、数据库管理功能,而且MapGIS还支持二次开发。MapGIS有两种数据格式,分别是加密数据文件和明码文件。明码文件可以通过MapGIS平台打开编辑,还可以通过txt、word等文件格式打开、浏览、编辑,这样为MapGIS数据文件的修改提供了多种途径。首先介绍了MapGIS中明码文件的基本特点,并列出了点、线、区、网文件的明码文件的逻辑结构和结构里面包含的信息;然后,重点介绍如何利用点、线、面、区加密文件获取明码文件和将明码文件转换成点、线、面、区加密文件,以及如何利用明码文件在坐标转换中实现平面直角坐标转经纬度坐标。

MapGIS is the large basic geographic information system software developed by China with functions including digital mapping, spatial analysis and database management. MapGIS has two data formats, which are encrypted date files and the ASCII code files. The ASCII files can be opened to be edited by MapGIS platform. You can also use txt, word and other file formats to open, view and edit the ASCII code files. And this can provides many ways for modifying MapGIS data files. This paper gives the introduction of the basic characteristics, logical construction and information of the ASCII code files of MapGIS . Then this paper highlights on how to realize the mutual conversion of wt, wl, wp and the ASCII code files and how to use the ASCII code files to realize converting the planimetric rectangular coordinates to the longitude -latitude coordinates in coordinates conversion.