Hierarchical Model

Hierarchical Model: -

The hierarchical database organizes data in a tree structure. Data is structured downward in a hierarchy of tables. Any level in the hierarchy can have unlimited children, but any child can have only one parent. Hierarchical DBMS have not gained any noticeable acceptance for use within GIS. They are oriented for data sets that are very stable, where primary relationship among the data change frequently or never at all. Also, the limitation on the number of parents that an element may have is not always conducive to actual geographic phenomenon.