# Project flipped upside down after reoptimization **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [September 14, 2022, 1:07pm UTC](https://community.pix4d.com/t/project-flipped-upside-down-after-reoptimization/23916 "2022-09-14T13:07:44Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![scottsamms17](https://avatars.discourse-cdn.com/v4/letter/s/e47774/32.png) [@scottsamms17](https://community.pix4d.com/u/scottsamms17)\ **Post date:** [September 14, 2022, 1:07pm UTC](https://community.pix4d.com/t/project-flipped-upside-down-after-reoptimization/23916/1 "2022-09-14T13:07:45Z")
After adding my GCPs after step 1( I noticed theres almost a 30m difference in elevation in point cloud and GCPs), i reoptimized and ran step 2 & 3 and once finished the full project is completely upside down and i cannot rotate up right and seems like the quality is terrible. Ive done a few projects and never experienced this problem yet. any idea whats different about this one? ---
**Author:** ![Rosana\_Lin](https://avatars.discourse-cdn.com/v4/letter/r/71e660/32.png) [@Rosana\_Lin](https://community.pix4d.com/u/Rosana_Lin)\ **Post date:** [September 15, 2022, 2:40am UTC](https://community.pix4d.com/t/project-flipped-upside-down-after-reoptimization/23916/2 "2022-09-15T02:40:16Z")
Hi @scottsamms17 Welcome to our Community! May I confirm if the project orientation was good before adding GCPs after step 1? If that is the case, I would suggest having a look at the Coordinates Order of the GCPs in the GCP/MTP Manager. ![](https://global.discourse-cdn.com/pix4d/original/2X/b/bb235cfd573177e474b49c9ff98f70d9684b8316.png) Another way that could also help is to orient the project when step 1 is completed. You can find the step-by-step instruction here: [How to orient a project](https://support.pix4d.com/hc/en-us/articles/205360385-How-to-orient-a-project?source=search). Regards, Rosana