在认识的基础上进行逐步抽象，最后得到数字化的空间数据，这正是OpenGIS九层抽象模型前五层所描述的内容。最后是空间数据库模型，进一步强调了该抽象过程。

本章的内容有助于加深对空间数据和空间信息的理解。

-On the basis of the gradual understanding of the abstract, the resulting digital spatial data, which is nine OpenGIS abstract model described in the contents of the previous five. Finally, spatial database model, further emphasized the abstract process. This chapter will help to enhance spatial data and spatial information for understanding.