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# Adjust Map Transformation
After merging several maps into a single MapSet, you might notice that some individual maps are not perfectly aligned. You can manually adjust the transformation properties (such as position and rotation) of each map individually using one of the following methods:
* **Web-based Viewer** – Use the MapSet viewer in the Developer Portal to fine-tune map placement directly in your browser.
* **Unity Editor** – Use the [MapSet Alignment Sample Scene](/multiset/unity-sdk/sample-scenes/mapset-alignment.md) in the Unity SDK. This is **recommended for large scans** as it provides better performance and more precise control.
By selecting a particular map within either tool, you can fine-tune its placement—shifting it slightly or rotating it—to better match the surrounding maps. These adjustments help in correcting any misalignments or rotation errors that occurred during the merge process, ensuring that the maps fit together seamlessly within the MapSet.
It's important to note that this adjustment step is optional. You only need to adjust individual map transformations if you observe errors or discrepancies after merging.
### Using the Web-based Viewer
Go to **Developer Portal** -> **MapSet** -> **View Mapsets** -> **View Maps**
Analyze the map transformations, and if you notice errors produced during merging, you can select individual maps and adjust their position and rotation to align them accurately with their real-world transformations.
Click on the **Update** button to save your transformation.
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