I love short and consist install instructions. I know this is a MySQL blog but our good friend PostGreSQL has a great GIS library. This is what I learned upgrading our PostGIS system to GIS 1.5. Much thanks to Jeremy Tunnell for give this document it’s start.

Start with CentOS 5.6 x86_64 basic install.

Add the PostgreSQL Yum repository to your system.

 $ wget http://yum.pgrpms.org/reporpms/9.0/pgdg-centos-9.0-2.noarch.rpm
 $ rpm -i pgdg-centos-9.0-2.noarch.rpm

Another location for these is DAG. I have to tried these so your results may very.

You will need to exclude the packages CentOS provide by added two lines to the BASE and UPDATE sections of /etc/yum.repos.d/CentOS-Base.repo. They are:

exclude=postgresql*
exclude=geos*

You you are ready to install the needed packages. This includes proj version 4 and geos version 3.

 $ yum install postgresql90-contrib.x86_64
 $ yum install postgis90.x86_64
 $ yum install postgresql90-server
 $ yum install proj
 $ yum install geos
 $ yum install php-pear
 $ yum install php-devel

GEOS

There may be some dependencies you will have to work through. If you are using PDO and haven’t installed the pgsql PDO drivers, you can do it now:

 $ pecl install pdo_pgsql

PL/pgSQL

You you are ready to initialize the database files and start postgresql.

 $ service postgresql-9.0 initdb
 $ service postgresql-9.0 start

Now you can change to the postgres user and begin installing the functions for GIS. You have to start with defining the language.

 $ su – postgres
 $ psql
 # create language plpgsql ;
 # \q

Now you can create your database and add the GIS functions calls to it.

 $ createdb geos
 $ psql -d geos -f /usr/pgsql-9.0/share/contrib/postgis-1.5/postgis.sql
 $ psql -d geos -f /usr/pgsql-9.0/share/contrib/postgis-1.5/spatial_ref_sys.sql

You you can verify the install.

 $ psql geos
 # select postgis_full_version();
                                              postgis_full_version
——————————————————————————————————–
 POSTGIS=”1.5.2″ GEOS=”3.2.2-CAPI-1.6.2″ PROJ=”Rel. 4.7.1, 23 September 2009″ LIBXML=”2.6.26″ USE_STATS
(1 row)

For more on using PostGIS check out Jeremy’s “PostGIS part 2”.

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Mark Grennan