> For the complete documentation index, see [llms.txt](https://docs.phoenixlidar.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.phoenixlidar.com/spatialexplorer-8-and-9/user-interface/toolbars/workflow/ground-control.md).

# Align to GCPs

<figure><img src="/files/iCBx2Y3v6sihTyY8DPeY" alt=""><figcaption></figcaption></figure>

The Align to GCPs tool automatically compute vertical residuals between GCPs and the pointcloud. These residuals will appear in the corrections window. Residuals/Corrections can be computed solely for analysis purposes, however they can be applied to the pointcloud as a rigid adjustment if desired. For a variable adjustment ("rubber sheet") in respect to GCPs, see [LiDARSnap with Ground Control](/spatialexplorer-8-and-9/user-interface/toolbars/workflow/lidarsnap-v4/ground-control-with-lidarsnap.md).&#x20;

For information on importing ground control into the project, see [Project->Ground Control](/spatialexplorer-8-and-9/user-interface/windows/project/ground-control-points-gcps.md).