# gcp processing

**URL:** https://community.pix4d.com/t/gcp-processing/6983
**Category:** PIX4Dmapper Questions/Troubleshooting
**Created:** [August 6, 2018, 7:48am UTC](https://community.pix4d.com/t/gcp-processing/6983 "2018-08-06T07:48:03Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![selvakumar\_ganesan](https://avatars.discourse-cdn.com/v4/letter/s/9fc29f/32.png) [@selvakumar\_ganesan](https://community.pix4d.com/u/selvakumar_ganesan)
#### Post date: [August 6, 2018, 7:48am UTC](https://community.pix4d.com/t/gcp-processing/6983/1 "2018-08-06T07:48:03Z")

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&nbsp;Hi,

I have marked GCP points after completion of initial using Ray Cloud.

After that I had processed point Cloud & Ortho, generated it. I had imported the point Cloud & GCP in someother software, in that Gcp points are placed on someother place of point Cloud. There is a Z variation between point Cloud and GCP. What may be the reason this variation? Is there any problem in processing? Help me to find the problem.

Here I have attached my project’s quality report for ur reference

**[http://www.fileconvoy.com/dfl.php?id=gb6422edd0adc0e0f100010366864261e9d5fa41bc4](http://www.fileconvoy.com/dfl.php?id=gb6422edd0adc0e0f100010366864261e9d5fa41bc4)**

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<div class="post-metadata">

### Author: ![Cristina\_Timofte](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/cristina_timofte/32/221_2.png) [@Cristina\_Timofte](https://community.pix4d.com/u/Cristina_Timofte)
#### Post date: [August 7, 2018, 1:13pm UTC](https://community.pix4d.com/t/gcp-processing/6983/2 "2018-08-07T13:13:38Z")

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Hi,

&nbsp;

Thank you for sharing the&nbsp;quality report. Since your output, CS is the same as the&nbsp;GCP’s CS this shift should not have a place.

Because the shift occurs in the third party software could you provide some more details as:

Which software&nbsp;do you use for comparison

Are the GCP’s, and the point cloud imported correctly?

Have you checked&nbsp;the CS of both inputs in the third party,

Could you post here a screenshot to better understand the&nbsp;shift?

&nbsp;

Thanks,

Ina

&nbsp;