PostGIS Cookbook - Second Edition

Structuring spatial data with table inheritance

An unusual and useful property of the PostgreSQL database is that it allows for object inheritance models as they apply to tables. This means that we can have parent/child relationships between tables and leverage that to structure the data in meaningful ways. In our example, we will apply this to hydrology data. This data can be points, lines, polygons, or more complex structures, but they have one commonality: they are explicitly linked in a physical sense and inherently related; they are all about water. Water/hydrology is an excellent natural system to model this way, as our ways of modeling it spatially can be quite mixed depending on scales, details, the data collection process, and a ...