citygml-tools is a command line utility that bundles several operations for processing CityGML files.
citygml-tools is licensed under the Apache License, Version 2.0.
LICENSE file for more details.
The latest stable release of citygml-tools is 2.2.0.
- To file bugs found in the software create a GitHub issue.
- To contribute code for fixing filed issues create a pull request with the issue id.
- To propose a new feature create a GitHub issue and open a discussion.
Download and unzip the latest release or build the program from
source. Afterwards, open a shell environment and run the
citygml-tools script from the program folder to launch the
To show the help message and all available commands of citygml-tools, simply type the following:
> citygml-tools --help
This will print the following usage information:
Usage: citygml-tools [-hV] [--extensions=<folder>] [-L=<level>] [--log-file=<file>] [--pid-file=<file>] [@<filename>...] [COMMAND] Collection of tools for processing CityGML files. [@<filename>...] One or more argument files containing options. -L, --log-level=<level> Log level: error, warn, info, debug (default: info). --log-file=<file> Write log messages to this file. --pid-file=<file> Create a file containing the process ID. --extensions=<folder> Load extensions from this folder. -h, --help Show this help message and exit. -V, --version Print version information and exit. Commands: help Displays help information about the specified command stats Generates statistics about the content of CityGML files. validate Validates CityGML files against the CityGML XML schemas. apply-xslt Transforms city objects based on XSLT stylesheets. change-height Changes the height values of city objects by a given offset. remove-apps Removes appearances from city objects. to-local-apps Converts global appearances into local ones. clip-textures Clips texture images to the extent of the target surface. subset Creates a subset of city objects based on filter criteria. filter-lods Filters LoD representations of city objects. reproject Reprojects city objects to a new coordinate reference system. from-cityjson Converts CityJSON files into CityGML. to-cityjson Converts CityGML files into CityJSON. upgrade Upgrades CityGML files to version 3.0.
To get help about a specific command of citygml-tools, enter the following and replace
COMMAND with the name of
the command you want to learn more about:
> citygml-tools help COMMAND
The following example shows how to use the
stats command to generate and print statistics about the content
of the specified CityGML file:
> citygml-tools stats /path/to/your/CityGML.gml
Supported CityGML versions
You can process CityGML 3.0, 2.0, and 1.0 files with citygml-tools. The
upgrade command provides an
easy way to convert your existing CityGML 2.0 and 1.0 datasets into the latest version 3.0 of CityGML.
to-cityjson commands support CityJSON 2.0, 1.1, and 1.0 files.
- Java 11 or higher
citygml-tools can be run on any platform providing appropriate Java support.
citygml-tools is also available as Docker image. You can either build the image yourself using the provided
or use a pre-built image from Docker Hub: https://hub.docker.com/r/citygml4j/citygml-tools.
To build the image, clone the repository to your local machine and run the following command from the root of the repository:
> docker build -t citygml-tools .
An official image can be pulled from Docker Hub as shown below.
> docker pull citygml4j/citygml-tools:TAG
TAG label with the version of citygml-tools you want to use such as
refers to the latest stable release and is also the default value if no tag is specified. If you want to pull the
most recent unreleased snapshot of citygml-tools, use
edge as tag.
How to use the image
Using citygml-tools via Docker is simple:
> docker run --rm citygml-tools
This will show the help message and all available commands of citygml-tools.
The following command mounts a local directory at
/data using the
-v parameter and runs the
of citygml-tools to convert all CityGML files in the mounted volume into CityJSON.
> docker run --rm -u 1000 -v /path/to/your/data:/data citygml-tools to-cityjson *.gml
/data is the default working directory inside the container. Relative paths to input files like
in the above example are automatically resolved against
/data by citygml-tools. If you mount your local directory at
a different path inside the container, you must specify the full path to your input files, of course.
-u parameter to pass the username or UID of your current host's user to set the correct file permissions on
generated files in the mounted directory.
The citygml-tools image uses Eclipse Temurin OpenJDK binaries for Alpine Linux to keep the resulting images small. Additionally, it is written as multi-stage image, which means the "JDK image" is only used for building, while the final application gets wrapped in a smaller "JRE image".
By default, the container process is executed as non-root user. The default working directory inside the container
citygml-tools uses Gradle as build system. To build the program from source, clone the repository to your local machine and run the following command from the root of the repository.
> gradlew installDist
The script automatically downloads all required dependencies for building and running citygml-tools. So make sure you are connected to the internet. The build process runs on all major operating systems and only requires a Java 11 JDK or higher to run.
If the build was successful, you will find the citygml-tools package under