PostGIS Raster

This type of database overlay loads raster data from a PostGIS Raster Database.

Select Add Overlay > Databases > PostGIS Raster.

Select the PostGIS Raster Layer you wish to open as a SIS overlay.

Option Description


The PostgreSQL database server host.

Port Number

The PostgreSQL database server port.


Specify the database to connect to.


PostgreSQL database user name.


Password for the specified PostgreSQL user name.

Save connection details in UI settings database (with encrypted password)

Check this tickbox if SIS should store these connection details in the UI settings database. The password will be stored in encrypted form for security

Saved connection name

This text box will become active if the Save connection details in UI settings database (with encrypted password) tickbox is checked. Enter a meaningful name for this connection. This text box cannot be left blank and the same name cannot be used twice.

Note: You cannot select PostGIS Raster Layers that are stored in PostGIS 2.0 as a filesystem raster (such rasters are called out-db). This limitation is not present if using PostGIS 2.1 or later.

The difference in behaviour is due to changes in the ST_AsBinary function of the PostGIS Raster API between 2.0 and 2.1 releases. (PostGIS 2.0 does not allow you to query out-db rasters as in-db. See However PostGIS 2.1 or later allows this. See

Connection Type

  1. Dynamic: Maintains an active connection to the PostgreSQL Database, with all redraws returning to the server. The Dataset will be editable, subject to PostgreSQL user privileges.
  2. Local cache: Makes a local copy of the entire table. The dataset will be read-only.
  3. One-off import: Copies the entire table into an Internal Overlay.

Click Finish.