On constructing the earth framework model

The framework model of the earth is the core framework of digital earth system, it directly affect the success of constructing digital earth system, and has a profound effect on the usability and user-friendly of the system. It can promote the speed of construction of digital earth system, and can enhance user´s understanding of the digital earth system. This paper firstly discuss how to construct parametric spherical subdivision model which is the basis of the framework model, then combines with data encoding and index method, referring coordinates and projection mode these key aspects to discuss how to construct framework model of the earth, and then presents the effectiveness of using this framework model of the earth in our practice.