# Merging problematic projects

**URL:** <https://community.pix4d.com/t/merging-problematic-projects/9887>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [November 16, 2019, 12:25pm UTC](https://community.pix4d.com/t/merging-problematic-projects/9887 "2019-11-16T12:25:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@Phil](https://community.pix4d.com/u/Phil)\
**Post date:** [November 16, 2019, 12:25pm UTC](https://community.pix4d.com/t/merging-problematic-projects/9887/1 "2019-11-16T12:25:16Z")

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Hi!

My situation:  
**2 days of flying**

**First day:**  
First day I flew 3 out of 4 missions at 100m over forest - turns out it was too low.  
I flew one mission at 150m because otherwise I would not have had a clear line of sight.

Back at the office (after processing) it turned out that just 60% of the area could be stitched properly to a mosaic.

**Second day**  
Due to bad weather I had to stand down for two weeks. Then I was forced to fly at low temperatures with mediocre lighting conditions.  
I flew at 200m.

I made MTPs and merged the **200m\_Project** with the **150m\_Project**. Looks neat.

My next step would be to generate MTPs for the **200m150\_MERGE** and **100m\_Project**. I would exclude the parts with very dense forest from the **100m\_Project**. Then I would merge them.

Is this procedure tolerable? we have now winter here so there is no second chance to fly.

Best Regards,  
Phil

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**Author:** ![Phil](https://avatars.discourse-cdn.com/v4/letter/p/e95f7d/32.png) [@Phil](https://community.pix4d.com/u/Phil)\
**Post date:** [November 19, 2019, 3:05pm UTC](https://community.pix4d.com/t/merging-problematic-projects/9887/2 "2019-11-19T15:05:12Z")

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Any ideas?

Regards, Phil

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**Author:** ![Beata](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/beata/32/187_2.png) [@Beata](https://community.pix4d.com/u/Beata)\
**Post date:** [November 26, 2019, 11:59am UTC](https://community.pix4d.com/t/merging-problematic-projects/9887/3 "2019-11-26T11:59:38Z")

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Hi Phil.

Could you tell us whether those three projects were acquired by the same camera?

In general, we recommend not to exceed a difference of a factor more than 2 for the GSD. If you are at the limit, it is likely that you will need to add more MTPs common to both projects to help the software merge the projects.

Best