# can't merge projects (linear projects) **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [February 24, 2018, 12:49am UTC](https://community.pix4d.com/t/cant-merge-projects-linear-projects/6053 "2018-02-24T00:49:26Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Jose\_C](https://avatars.discourse-cdn.com/v4/letter/j/cab0a1/32.png) [@Jose\_C](https://community.pix4d.com/u/Jose_C)\ **Post date:** [February 24, 2018, 12:49am UTC](https://community.pix4d.com/t/cant-merge-projects-linear-projects/6053/1 "2018-02-24T00:49:26Z")
I have a linear project of 2000 photos, for a 20 km x 25m corridor, with images captured in 6 flights using PPK technology, so I don’t need 3D-GCP’s, just checkpoints. If I process all the project as a whole I get a rotation in my model at the middle. Hence I processed each flight separately and got good individual results. Now, after this, I have not been able to merge any combination of two or more subsequent projects (tried first merging all), I get a failure at the very end of the merge projects process. This procedure had worked for me for other linear projects. Any ideas? I get this message: Writing tie points images done (Failed!) Log details: [2018.02.23 19:37:20][28%RAM][41%CPU][Info]: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* ``` [2018.02.23 19:37:20][28%RAM][41%CPU][Info]: \*\*\*\*\*\*\*\*\*\*\*\* merge cameras and tie points \*\*\*\*\*\*\*\*\*\*\* [2018.02.23 19:37:20][28%RAM][41%CPU][Info]: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* [2018.02.23 19:37:22][25%RAM][48%CPU][Info]: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* [2018.02.23 19:37:22][25%RAM][48%CPU][Info]: \*\*\*\*\*\*\*MergeProcessing\*\*\*\*\*\*\*\*\* [2018.02.23 19:37:22][25%RAM][48%CPU][Info]: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* [2018.02.23 19:37:22][25%RAM][48%CPU][Info]: merge project 0 WE\_Flight\_034 [2018.02.23 19:37:27][31%RAM][44%CPU][Info]: 0 common tie points [2018.02.23 19:37:27][31%RAM][44%CPU][Warning]: No common tie points or cameras: effective GPS bias rigid transform: scale 1 trans -1245 -58 5 [2018.02.23 19:37:27][31%RAM][44%CPU][Warning]: RotationMatrix xyz -0 0 -0 opk 3.14159 -0 0 [2018.02.23 19:37:27][31%RAM][44%CPU][Warning]: 1 0 0 [2018.02.23 19:37:27][31%RAM][44%CPU][Warning]: 0 1 0 [2018.02.23 19:37:27][31%RAM][44%CPU][Warning]: 0 0 1 [2018.02.23 19:37:27][31%RAM][44%CPU][Info]: NrNewCameras: 0 nrExistingCameras: 0 [2018.02.23 19:37:53][38%RAM][14%CPU][Info]: GCP \<10\> not enough cameras [2018.02.23 19:37:53][38%RAM][14%CPU][Info]: GCP \<22\> not enough cameras [2018.02.23 19:37:53][38%RAM][14%CPU][Info]: GCP \<23\> not enough cameras [2018.02.23 19:37:53][38%RAM][14%CPU][Info]: nrTracks 3454167 [2018.02.23 19:37:54][34%RAM][14%CPU][Info]: merge project 1 WE\_ChepicaT2\_36 [2018.02.23 19:37:55][34%RAM][13%CPU][Info]: 0 common tie points [2018.02.23 19:37:55][34%RAM][13%CPU][Warning]: No common tie points or cameras: effective GPS bias rigid transform: scale 1 trans 1868 87 -7 [2018.02.23 19:37:55][34%RAM][13%CPU][Warning]: RotationMatrix xyz -0 0 -0 opk 3.14159 -0 0 [2018.02.23 19:37:55][34%RAM][13%CPU][Warning]: 1 0 0 [2018.02.23 19:37:55][34%RAM][13%CPU][Warning]: 0 1 0 [2018.02.23 19:37:55][34%RAM][13%CPU][Warning]: 0 0 1 [2018.02.23 19:37:55][34%RAM][13%CPU][Info]: NrNewCameras: 0 nrExistingCameras: 0 [2018.02.23 19:38:07][36%RAM][13%CPU][Info]: GCP \<24\> not enough cameras [2018.02.23 19:38:07][36%RAM][13%CPU][Info]: GCP \<25\> not enough cameras [2018.02.23 19:38:07][36%RAM][13%CPU][Info]: nrTracks 4841913 [2018.02.23 19:38:07][36%RAM][13%CPU][Error]: No calibrated cameras. ```   ---
**Author:** ![Julie\_Pichon](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/julie_pichon/32/592_2.png) [@Julie\_Pichon](https://community.pix4d.com/u/Julie_Pichon)\ **Post date:** [February 28, 2018, 7:20am UTC](https://community.pix4d.com/t/cant-merge-projects-linear-projects/6053/2 "2018-02-28T07:20:05Z")
Hi Jose, Would it be possible to share with us the following for the final project created by merging the sub-projects (e.g. via WeTransfer)? - The project log file (text file): …\project\_name\project\_name.log - The project file (.p4d): …\project\_name.p4d And for each individual sub-project ideally (only two if you have many): - The quality report (.pdf format): …\project\_name\1\_initial\report\project\_name\_report.pdf - The project file (.p4d): …\project\_name.p4d ---
**Author:** ![OEM-reseller\_Sci.Aer](https://avatars.discourse-cdn.com/v4/letter/o/ce7236/32.png) [@OEM-reseller\_Sci.Aer](https://community.pix4d.com/u/OEM-reseller_Sci.Aer)\ **Post date:** [August 9, 2018, 3:15am UTC](https://community.pix4d.com/t/cant-merge-projects-linear-projects/6053/3 "2018-08-09T03:15:22Z")
I have had the same error appear while trying to do a similar activity. Are there any updates on how this occurred? I have other issues with my project too so I may post them separately ---
**Author:** ![Blaz](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/blaz/32/4344_2.png) [@Blaz](https://community.pix4d.com/u/Blaz)\ **Post date:** [August 13, 2018, 2:27pm UTC](https://community.pix4d.com/t/cant-merge-projects-linear-projects/6053/4 "2018-08-13T14:27:16Z")
@Sci.Areo, at the moment it is not clear what could cause the issue and we would need additional information in order to get an overview of the situation. Could you submit a support ticket using the request form including all the information we requested in the previous comment?