How do you compare and merge QGIS styles as XML files using version control or diff tools?

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QGIS styles are a powerful way to customize the appearance of your maps and data layers. They define how features are symbolized, labeled, categorized, and rendered in QGIS. You can export and import QGIS styles as XML files, which are human-readable and editable. This allows you to share, reuse, and modify QGIS styles across different projects and platforms. But how do you compare and merge QGIS styles as XML files using version control or diff tools? In this article, you will learn how to use some common tools and techniques to manage your QGIS style files as XML.

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Swaroop Kallakuri

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1 Why use version control or diff tools for QGIS styles?

Version control and diff tools are software applications that can be used to track changes, compare differences, and merge conflicts in text files. Although these are mainly used by programmers and developers to manage code, they can also be useful for QGIS users who work with XML files. Utilizing version control or diff tools for QGIS styles allows you to keep a history of your style changes, collaborate with other QGIS users, review and improve your style code, and experiment with different style options. This way, you can revert to previous versions if needed, resolve style conflicts, fix errors, and compare results.

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Swaroop Kallakuri

CTO - Piren Technology | Follow me to get daily insights about A.I & Quantum computing
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Version control and diff tools are essential for managing changes to QGIS styles in collaborative or iterative projects. They allow multiple users to work on styles concurrently, track modifications, resolve conflicts, and ensure consistency across different versions of the styles. With version control, you can maintain a history of changes, revert to previous versions if needed, and collaborate more efficiently.

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2 How to export QGIS styles as XML files?

In order to use version control or diff tools for QGIS styles, you need to export your styles as XML files from QGIS. You can either export a single style from the Layer Styling panel by right-clicking on the style name and selecting Export > Save as QGIS Layer Style File, or you can export multiple styles from the Style Manager. To do this, go to Settings > Style Manager, select the styles you want to export, click on the Export button and choose QGIS Layer Style File. Then select a location and name for your XML file and click Save.

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Swaroop Kallakuri

CTO - Piren Technology | Follow me to get daily insights about A.I & Quantum computing
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Exporting QGIS styles as XML files is straightforward. In QGIS, you can do this by right-clicking on the layer in the Layers panel, selecting "Styles," and then choosing "Export..." This prompts you to save the style as an XML file, which can then be shared or version-controlled. Alternatively, you can use the Style Manager to export multiple styles at once.

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3 How to use version control for QGIS styles?

Version control is a system that records changes to a file or set of files over time, allowing you to revert to a specific version, compare versions, and merge changes. Git is the most popular and widely used version control system. It stores files and their history in a repository, which can be local or remote on platforms like GitHub or Bitbucket. To use version control for QGIS styles, you need to initialize a Git repository in the folder containing your XML files. You can do this via the command line or graphical user interface like GitKraken or SourceTree. Additionally, you must add your XML files and commit them with a message describing your changes. This creates a snapshot of your files in the repository which can then be pushed to a remote repository if you want to share them with others or access them from different devices. You can also clone or pull changes from a remote repository if you want to update your local repository with the latest version. Finally, create branches to work on different features or experiments without affecting the main branch, and switch between branches, compare them, and merge them when you are done.

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4 How to use diff tools for QGIS styles?

Diff tools are software applications that show the differences between two or more text files. By highlighting added, deleted, or modified lines, they help identify and resolve conflicts. Diff tools can be integrated with version control systems or used as standalone applications. Examples of diff tools include Meld, Diffuse, and KDiff3. Meld has a user-friendly interface that displays differences between two or three files or folders in a side-by-side or tabbed view. Diffuse has a similar interface to Meld, but with more options to customize the colors, fonts, and layout. KDiff3 has a more complex interface that displays differences between two or three files or folders in a four-pane view. To use diff tools for QGIS styles, you need to open your XML files in the diff tool of your choice, compare the differences between your files and identify the conflicts, merge the changes from one file to another or create a new file with the merged changes, and save your files and commit them to your version control system if applicable.

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5 How to test your merged QGIS styles?

After merging your QGIS styles as XML files with version control or diff tools, testing them in QGIS is essential to ensure they work as expected. To do this, you must import your XML files into QGIS, either with the Layer Styling panel or the Style Manager. Then, you can apply your styles to data layers and observe the results in the map canvas, as well as in the Print Layout or 3D Map View. If adjustments are necessary, export them again as XML files and commit them to your version control system if applicable.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How do you compare and merge QGIS styles as XML files using version control or diff tools?

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1 Why use version control or diff tools for QGIS styles?

2 How to export QGIS styles as XML files?

3 How to use version control for QGIS styles?

4 How to use diff tools for QGIS styles?

5 How to test your merged QGIS styles?

6 Here’s what else to consider

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