# GCP elevations not reflected in pointcloud

**URL:** <https://community.pix4d.com/t/gcp-elevations-not-reflected-in-pointcloud/4021>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [September 19, 2017, 6:38pm UTC](https://community.pix4d.com/t/gcp-elevations-not-reflected-in-pointcloud/4021 "2017-09-19T18:38:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Erik\_Graham](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/erik_graham/32/360_2.png) [@Erik\_Graham](https://community.pix4d.com/u/Erik_Graham)\
**Post date:** [September 19, 2017, 6:38pm UTC](https://community.pix4d.com/t/gcp-elevations-not-reflected-in-pointcloud/4021/1 "2017-09-19T18:38:52Z")

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Does anyone know why the elevation of GCP’s isn’t the same elevation when they are exported to a point cloud? Seems like the elevation of those points should be consistent between Pix4d Desktop and the exported point cloud in Autocad, but they aren’t.

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**Author:** ![Pierangelo\_Rothenbuhler](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/pierangelo_rothenbuhler/32/2439_2.png) [@Pierangelo\_Rothenbuhler](https://community.pix4d.com/u/Pierangelo_Rothenbuhler)\
**Post date:** [September 20, 2017, 11:02am UTC](https://community.pix4d.com/t/gcp-elevations-not-reflected-in-pointcloud/4021/2 "2017-09-20T11:02:00Z")

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If I correctly understood, you have included Ground Control Points (GCPs) in a project in Pix4D software by marking them in images and reoptimizing (Process \> Reoptimize) the project after step 1. Initial Processing. Then, you have created a densified point cloud during step 2. Point Cloud and Mesh. You have imported this densified point cloud in AutoCAD with the GCPs and they do not align in AutoCAD.&nbsp;Is this the issue you have described? If not please add more information and if possible screenshots.&nbsp;

The problem might be with how the coordinate systems were defined. I would double check the coordinate systems both in Pix4D and AutoCAD. In Pix4D I would check if the GCP and output coordinate system are defined as they should. Here is an article on how you can check them:&nbsp;[https://support.pix4d.com/hc/en-us/articles/202560029&nbsp;](https://support.pix4d.com/hc/en-us/articles/202560029%C2%A0)

Maybe the vertical coordinate system needs to be modified, which could explain the shift you are seeing.&nbsp;

Let us know if you could solve the issue!