基于面向对象的地图投影转换模块设计  

Module Design for Map Projection Transformation Based on Object Oriented Methods

作　　者：陈焱明[1] 王结臣[1] 李丽[1] 

机构地区：[1]南京大学地理信息科学系,南京210093

出　　处：《热带地理》2009年第1期69-73,共5页Tropical Geography

基　　金：国家基础科学人才培养基金(J0630535)

摘　　要：以基于面向对象的方法实现地图投影转换模块设计,探讨该方法在地图投影转换中以及具体投影转换模块的设计及实现,在VC6.0平台下通过相关接口的建立以及地理坐标系和投影坐标系两大主要类的设计和扩充,实现地理坐标系间、投影坐标系间或两者间的投影转换。该模块有利于快速、高效编程的实现,并具有扩展性强和易于维护等优势。Map projection transformation is a key research issue in cartography as well as in GIS. With the continuous updating and improvement of geographical data, effective handling of map projection transformation for geographic information is needed. In this paper, a map projection transformation module developed is presented based on object-oriented methods and discuss the advantages of the methods, with the design and implementation of the module explained in detail. In a VC-6.0 platform, a number of systems have been developed including Cnvt-Coordinate-System, I-Coordinate-System, Geo-Coordinate-System, Prj-Coordinate- System, and Ellipsoid-Set. Among these systems, the Cnvt-Coordinate-System is a key system that draws other relevant methods to accomplish the projection transformation operation. It is concluded that by extending the Geo-Coordinate-System and Prj-Coordinate-System, the module can implement projection transformation between different geographic coordinates systems, or different projection systems, or between the two types of systems. This module can make projection transformation fast and efficient, possesses strong expandability and is easy to maintain.

关 键 词：面向对象 地图投影 地图投影变换 地理信息系统 

分 类 号：P226[天文地球—大地测量学与测量工程]