> 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/gnss-hardware-and-ground-control/stonex-s-900-and-cube-a/surveying-ground-control-points.md).

# Surveying ground control points

Survey ground control points for use in validating elevation values of a point cloud

Once you have correctly configured your base and rover you can begin surveying control points. Navigate to the Survey menu at the bottom of the main screen. 

![Survey menu of Cube-A](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/7VyowlhMOAjVWPTtLdHp/Screenshot_20210302-175450_Cube-a%20v5.jpg)

Select Point Survey, then click the nail icon and select Control Point.

![Selecting to survey Control Point in Cube-A](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/vLHJRHKrVIHF0Va1M4Xu/Screenshot_20210302-175500_Cube-a%20v5.jpg)

Configure the control point settings menu. Values of HRMS, VRMS, plane limit, elevation limit, should be configured to satisfy the accuracy requirements of your project. 

![Control point settings](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/1ooNPxriuJCtDM2nvrdY/Screenshot_20210302-175511_Cube-a%20v5.jpg)

You can always view collected points by navigating back to the Project menu and selecting Collected Points

![Collected points menu](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/NkWFSVkq8gBNDgUrthl3/Screenshot_20210305-154916_Cube-a%20v5.jpg)