# Shift in the point cloud

**URL:** <https://community.pix4d.com/t/shift-in-the-point-cloud/7081>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [August 22, 2018, 7:13am UTC](https://community.pix4d.com/t/shift-in-the-point-cloud/7081 "2018-08-22T07:13:12Z")\
**Posts on this page:** 4\
**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 22, 2018, 7:13am UTC](https://community.pix4d.com/t/shift-in-the-point-cloud/7081/1 "2018-08-22T07:13:12Z")

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Hi,

I had Completed my initial processing using Alternative calibration and all prior for internal parameter optimisation. There is a shift in the point cloud. Eventhough i had picked GCP points, the shift doesn’t adjusted. What may be&nbsp; the reason. Please help me to solve problem.&nbsp;

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**Author:** ![momtanu.chakraborty](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/momtanu.chakraborty/32/269_2.png) [@momtanu.chakraborty](https://community.pix4d.com/u/momtanu.chakraborty)\
**Post date:** [August 23, 2018, 7:32pm UTC](https://community.pix4d.com/t/shift-in-the-point-cloud/7081/2 "2018-08-23T19:32:47Z")

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Hi Selvakumar,

Did you reoptimise&nbsp;after marking the GCPs ([https://support.pix4d.com/hc/en-us/articles/202560769-How-to-mark-GCPs-in-the-rayCloud](https://support.pix4d.com/hc/en-us/articles/202560769-How-to-mark-GCPs-in-the-rayCloud))?

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<div class="post-metadata">

**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 24, 2018, 4:29am UTC](https://community.pix4d.com/t/shift-in-the-point-cloud/7081/3 "2018-08-24T04:29:48Z")

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Yes I had reoptimised my project for the marked GCP. but there is no change in the point cloud. Still tere is a shift in it.

&nbsp;

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**Author:** ![momtanu.chakraborty](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/momtanu.chakraborty/32/269_2.png) [@momtanu.chakraborty](https://community.pix4d.com/u/momtanu.chakraborty)\
**Post date:** [August 28, 2018, 7:03pm UTC](https://community.pix4d.com/t/shift-in-the-point-cloud/7081/4 "2018-08-28T19:03:42Z")

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Hi Selvakumar,

Can you attach a screenshot of the GCP accuracy from the quality report?

It loks like you have two fllights at different heights. Is it so?

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