In view of the argument to the definition and the application scope about equivalent earth s radius in recent years,the paper gives the analysis and discussion about several parameters corresponding relations in the real earth and the equivalent earth,then gives the equivalency and limitations of equivalent earth s radius in order to apply correctly in p.

Then the model s visualization was implemented using OpenGL,and finally 3-D realistic terrain with dynamic character was formed.

The Noumenon that Return to the Composition Training：Writing trully;