PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS).
A. Vitol, N. Zhukova, и A. Pankin. Proceedings of the 21th International Conference on Conceptual Structures (ICCS 2013), том 7735 из Lecture Notes in Computer Science, стр. 266-276. Springer, (2013)