Meanwhile, we explicate the solution to some technical problems such as the data form, attribute relationship with graphics, the B + tree index of graphic cell of database, flows of data query, etc.

• 详细说明了在MAPGIS平台的支持下全国土地利用数据库的数据组织方式 ；以及外部属性与图形数据的关联方式、图库中图元的B+ 树索引的结构、数据检索、输出流程等关键技术问题的解决方案 .