# Merge projects without GCPs **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [July 26, 2023, 5:38pm UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258 "2023-07-26T17:38:26Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![nelsoncard\_09](https://avatars.discourse-cdn.com/v4/letter/n/a587f6/32.png) [@nelsoncard\_09](https://community.pix4d.com/u/nelsoncard_09)\ **Post date:** [July 26, 2023, 5:38pm UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/1 "2023-07-26T17:38:26Z")
Hi, It’s possible to merge two projects with just common MTPs? ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [July 28, 2023, 8:17am UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/2 "2023-07-28T08:17:37Z")
Hi @nelsoncard_09, Thank you for your question, and welcome to the Pix4D Community 🤝 . Common MTPs are not needed when merging two PIX4Dmatic projects. However, please ensure the following requirements concerning coordinate reference systems and accuracy are fulfilled. 1. The projects to be merged must have the same coordinate reference system, including both the horizontal and vertical coordinate systems. 2. The projects to be merged must have either the positioning accuracy of a PPK/RTK device or be geolocated with the use of GCPs. You can find out more here: > **[Merge Projects - PIX4Dmatic](https://support.pix4d.com/hc/en-us/articles/11043252302237-Merge-Projects-PIX4Dmatic)** > > PIX4Dmatic allows for the merging of multiple projects into a single unified project. This can be useful when capturing aerial or terrestrial images from different flights or perspectives to create... ---
**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:** [August 2, 2023, 3:15pm UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/3 "2023-08-02T15:15:49Z")
I’d like to add an additional trick to make sure that the projects you want to merge are located correctly for merging, even if you do not have RTK or GCPs. You can create MTPs in an overlapping area in your “reference” project, create a .txt file with their coordinates (you can read them at the bottom of the software interface) in the format described in this article: [https://support.pix4d.com/hc/en-us/articles/360038397752-Tie-points-GCPs-CPs-import-format-PIX4Dmatic#label3](https://support.pix4d.com/hc/en-us/articles/360038397752-Tie-points-GCPs-CPs-import-format-PIX4Dmatic#label3). These can be imported as “fake” GCPs in the other project you want to merge it with (ensuring it’s in the same coordinate reference system). There you can use them to have the project located correctly before merging. Another trick in case you only need to “align” two point clouds (without the need for having the calibration merged), you can use the “manual registration” workflow in PIX4Dsurvey too. ---
**Author:** ![nelsoncard\_09](https://avatars.discourse-cdn.com/v4/letter/n/a587f6/32.png) [@nelsoncard\_09](https://community.pix4d.com/u/nelsoncard_09)\ **Post date:** [August 3, 2023, 3:31pm UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/4 "2023-08-03T15:31:54Z")
Thanks for the reply, I’ll try this ---
**Author:** ![nelsoncard\_09](https://avatars.discourse-cdn.com/v4/letter/n/a587f6/32.png) [@nelsoncard\_09](https://community.pix4d.com/u/nelsoncard_09)\ **Post date:** [August 3, 2023, 4:50pm UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/5 "2023-08-03T16:50:08Z")
![1](https://global.discourse-cdn.com/pix4d/original/2X/e/edd01706c4d1ccc8f7218109af1faaa7785aead6.jpeg) How can i chargue the .txt file? none coordinate system works for me in the column format ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [August 4, 2023, 10:34am UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/6 "2023-08-04T10:34:49Z")
Hi @nelsoncard_09, What GCP coordinate system did you select? It seems that you selected a **geographic** coordinate system while your GCP table contains **projected** coordinates. Cheers, Daniele ---
**Author:** ![nelsoncard\_09](https://avatars.discourse-cdn.com/v4/letter/n/a587f6/32.png) [@nelsoncard\_09](https://community.pix4d.com/u/nelsoncard_09)\ **Post date:** [August 4, 2023, 4:57pm UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/7 "2023-08-04T16:57:01Z")
You’re right, it was a problem in my coordinate system. I followed @Pierangelo_Rothenbuhler’s recommendation and it worked for me, thanks. ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [August 7, 2023, 6:08am UTC](https://community.pix4d.com/t/merge-projects-without-gcps/27258/8 "2023-08-07T06:08:41Z")
hi @nelsoncard_09, I’m happy to hear that it is working fine for you. Let us know if there is anything else we can do for you. Happy mapping 🙂