Versions of PostgreSQL supported by which versions of PostGIS

PostgreSQL Version	PostGIS 1.3	PostGIS 1.4	PostGIS 1.5
8.1	Yes (no windows)	No	No
8.2	Yes	Yes	No
8.3	Yes	Yes	Yes
8.4	Yes	Yes	Yes
8.5	No?	Yes?	Yes

The development releases of PostgreSQL 8.5 has not been tested against any version of PostGIS, but we plan to support it for PostGIS 1.5. Any observations of PostgreSQL 8.5 against the aforementioned versions of PostGIS are welcome.

Versions of GEOS vs of PostGIS

The below chart shows which versions of GEOS work with which versions of PostGIS. The none means that you can get that version to work without GEOS, though its not recommended since a lot of functions will not be installed.

For the not recommended, this means that while you can get PostGIS to work with those versions, you'll be missing out on some PostGIS functions such as ST_Covers, ST_CoversBy and for PostGIS 1.5 the ST_HausdorffDistance and enhancements to ST_Buffer (both speed and functionality). GEOS 3.1 brought cascade union. GEOS 3.2 brought faster buffering and buffering enhancements, plus numerous enhancements with dealing with tolerance issues when unioning.

Geos Version	PostGIS 1.3	PostGIS 1.4	PostGIS 1.5
None	Yes (not recommended)	No	No
2.2	Yes (not recommended)	Yes (not recommended)	No
3.0	Yes	Yes (not recommended)	Yes (not recommended)
3.1	Yes	Yes	Yes (not recommended)
3.2	Yes	Yes	Yes