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PostGIS and spatial database

Connie Irwin

Joined: Aug 01, 2005
Posts: 8
So, does postGIS have it's own sql engine, or does it utilize the postgres sql. Can the two datatypes, the geometric and geographic be extended in the same fashion that a java class can be subclassed?


Connie Irwin
chris webster

Joined: Mar 01, 2009
Posts: 2030

Hi Connie,

Already replied to your other post, but just in case it helps:

* PostGIS builds upon the existing geometric data types in PostgreSQL.
* PostGIS also extends the existing indexing mechanisms in PostgreSQL to support indexing of spatial data, which obeys different rules from scalar data.
* PostGIS provides a set of additional spatial functions that can be used within SQL (and PGPLSQL) code, but the underlying SQL engine is provided by PostgreSQL itself.

Hope this helps a bit.

(And where are the PostGIs authors anyway?)


No more Blub for me, thank you, Vicar.
I agree. Here's the link:
subject: PostGIS and spatial database