# Two Projects, Two Different Elevations

**URL:** <https://community.pix4d.com/t/two-projects-two-different-elevations/32856>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [February 14, 2025, 12:06am UTC](https://community.pix4d.com/t/two-projects-two-different-elevations/32856 "2025-02-14T00:06:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ajbrennan](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@ajbrennan](https://community.pix4d.com/u/ajbrennan)\
**Post date:** [February 14, 2025, 12:06am UTC](https://community.pix4d.com/t/two-projects-two-different-elevations/32856/1 "2025-02-14T00:06:10Z")

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Our team flew a project area then returned several months later to fly an additional adjacent area. After processing both projects I have found that the overlapping areas differ in elevation anywhere from 1-6 feet. GCPs were used both times and they were established using the same survey control point. I have checked for all the normal blunders but cant seem to figure out what the problem is.

Any ideas?

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**Author:** ![giancarlo.patierno](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/giancarlo.patierno/32/5999_2.png) [@giancarlo.patierno](https://community.pix4d.com/u/giancarlo.patierno)\
**Post date:** [March 10, 2025, 6:16pm UTC](https://community.pix4d.com/t/two-projects-two-different-elevations/32856/2 "2025-03-10T18:16:29Z")

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Hi ajbrennan,  
could you share the Report of both projects? With no screenshoots at hand, I can only make suppositions:

- if one of the two projects shows a 1-6 ft of Camera Displacement: the Pix4D is recognizing the GCPs, but it’s unable to make the proper adjustment due to an unknown reason (log or report are needed to investigate further)
- if none of the two projects shows Camera Displacement: in one of the two projects, no GCPs where used (maybe they were selected as Check Points, or Manual Tie Points)  
In both cases, I kindly suggest to Create a Support Ticket, once Pixie allows you to do that (sometimes it’s thinking several minutes, before to go ahead with the interaction): until now, I opened several ones, and I always received a good support.  
Regards,  
Giancarlo