PostGIS

PostGIS is an open source spatial database based on PostgreSQL, and is currently one of the most popular open source spatial databases today.

Adding a PostGIS database

As with all formats, adding a shapefile to GeoServer involves adding a new store to the existing Stores through the Web Administration Interface.

Using default connection

To begin, navigate to Stores ‣ Add a new store ‣ PostGIS NG.

../_images/postgis.png

Adding a PostGIS database

Option Description
Workspace Name of the workspace to contain the database. This will also be the prefix of any layer names created from tables in the database.
Data Source Name Name of the database. This can be different from the name as known to PostgreSQL/PostGIS.
Description Description of the database/store.
Enabled Enables the store. If disabled, no data in the database will be served.
dbtype Type of database. Leave this value as the default.
host Host name where the database exists.
port Port number to connect to the above host.
database Name of the database as known on the host.
schema Schema in the above database.
user User name to connect to the database.
passwd Password associated with the above user.
namespace Namespace to be associated with the database. This field is altered by changing the workspace name.
max connections Maximum amount of open connections to the database.
min connections Minimum number of pooled connections.
fetch size Number of records read with each interaction with the database.
Connection timeout Time (in seconds) the connection pool will wait before timing out.
validate connections Checks the connection is alive before using it.
Loose bbox Performs only the primary filter on the bounding box. See the section on Using loose bounding box for details.
preparedStatements Enables prepared statements.

When finished, click Save.

Using JNDI

GeoServer can also connect to a PostGIS database using JNDI (Java Naming and Directory Interface).

To begin, navigate to Stores ‣ Add a new store ‣ PostGIS NG (JNDI).

../_images/postgisjndi.png

Adding a PostGIS database (using JNDI)

Option Description
Workspace Name of the workspace to contain the store. This will also be the prefix of all of the layer names created from the store.
Data Source Name Name of the database. This can be different from the name as known to PostgreSQL/PostGIS.
Description Description of the database/store.
Enabled Enables the store. If disabled, no data in the database will be served.
dbtype Type of database. Leave this value as the default.
jndiReferenceName JNDI path to the database.
schema Schema for the above database.
namespace Namespace to be associated with the database. This field is altered by changing the workspace name.

When finished, click Save.

Configuring PostGIS layers

When properly loaded, all tables in the database will be visible to GeoServer, but they will need to be individually configured before being served by GeoServer. See the section on Layers for how to add and edit new layers.

Using loose bounding box

When the option loose bbox is enabled, only the bounding box of a geometry is used. This can result in a significant performance gain, but at the expense of total accuracy; some geometries may be considered inside of a bounding box when they are technically not.

If primarily connecting to this data via WMS, this flag can be set safely since a loss of some accuracy is usually acceptable. However, if using WFS and especially if making use of BBOX filtering capabilities, this flag should not be set.

Publishing a PostGIS view

Publishing a view follows the same process as publishing a table. The only additional step is to manually ensure that the view has an entry in the geometry_columns table.

For example consider a table with the schema:

my_table( id int PRIMARY KEY, name VARCHAR, the_geom GEOMETRY )

Consider also the following view:

CREATE VIEW my_view as SELECT id, the_geom FROM my_table;

Before this view can be served by GeoServer, the following step is necessary to manually create the geometry_columns entry:

INSERT INTO geometry_columns VALUES ('','public','my_view','my_geom', 2, 4326, 'POINT' );

Performance considerations

GEOS

GEOS (Geometry Engine, Open Source) is an optional component of a PostGIS installation. It is recommended that GEOS be installed with any PostGIS instance used by GeoServer, as this allows GeoServer to make use of its functionality when doing spatial operations. When GEOS is not available, these operations are performed internally which can result in degraded performance.

Spatial indexing

It is strongly recommended to create a spatial index on tables with a spatial component (i.e. containing a geometry column). Any table of which does not have a spatial index will likely respond slowly to queries.

Common problems

Primary keys

In order to enable transactional extensions on a table (for transactional WFS), the table must have a primary key. A table without a primary key is considered read only to GeoServer.