1.1. System requirements

1.1.1. 3D City Database

Setting up an instance of the 3D City Database requires an existing installation of a PostgreSQL, Oracle, or PolarDB database.

PostgreSQL with PostGIS extension
Supported versions are PostgreSQL 11 and higher with PostGIS 2.5 and higher. Make sure to check the PostgreSQL versioning policy to find out which PostgreSQL versions are actively maintained or have reached end-of-life. The PostGIS support matrix shows which versions of PostgreSQL are supported by which versions of PostGIS and whether a specific PostGIS version has reached end-of-life.
Supported versions are Oracle 19c and higher. Make sure to check the Oracle lifetime support policy to find out which Oracle versions are actively maintained or have reached end-of-life.
PolarDB for PostgreSQL with Ganos extension
Supported versions are PolarDB 1.1 and higher with Ganos 4.6 and higher. Make sure to check the PolarDB documentation to find out which PolarDB and Ganos versions are actively maintained or have reached end-of-life.


It is recommended that you always install the latest patches, minor releases, and security updates for your database system. Database versions that have reached end-of-life are no longer supported by the 3D City Database.

The SQL scripts for creating the 3D City Database schema are written to be executed by the default command-line client of either database system – namely psql for PostgreSQL and SQL*Plus for Oracle. The scripts include meta commands specific to these clients and would not work properly when using a different client software. So please make sure psql or SQL*Plus is installed on the machine from where you want to set up the 3D City Database.

1.1.2. Importer/Exporter tool

The Importer/Exporter tool can run on any platform providing support for Java 8 and higher. The recommended version for running the Importer/Exporter is Java 11. The tool has been successfully tested on (but is not limited to) the following operating systems:

  • Microsoft Windows 7, 8, 10, 11;
  • Apple Mac OS X and macOS;
  • Ubuntu Linux 9 to 22.

Prior to the setup of the Importer/Exporter tool, a Java Runtime Environment (JRE) must be installed on your system. Java installation packages are offered and maintained by different vendors. The following list provides a non-exhaustive overview of Java distributions that are free to download and use:

Follow the installation instructions for your operating system. Note that starting from Java 17 long-term support (LTS) version, Oracle Java is again released under a no-fee and free-to-use license, while use of previous versions of Oracle Java remains restricted to a fee-based subscription license. Likewise, Java binaries from other vendors like Azul Zulu or Red Hat OpenJDK might require a license for commercial use or access to updates. Please carefully review the license terms and conditions of use provided by the vendors.

The Importer/Exporter is shipped with an installer that will guide you through the steps of the setup process. A full installation of the Importer/Exporter including database scripts, plugins and test datasets requires approx. 280 MB of hard disk space. Installing only the mandatory application files will use approx. 160 MB of hard disk space. Installation packages can be selected during the setup process.

The Importer/Exporter runs with 1 GB of main memory per default. The maximum available main memory is controlled by JVM default options. This setting should be reasonable on most platforms and for most import/export processes. If required, you can manually adapt the main memory limits in the starter script of the program or by using environment variables. Please refer to Section 4.1 for more details.