# processing area and merging two projects.

**URL:** <https://community.pix4d.com/t/processing-area-and-merging-two-projects/23693>\
**Category:** PIX4Dmapper\
**Created:** [August 25, 2022, 6:18pm UTC](https://community.pix4d.com/t/processing-area-and-merging-two-projects/23693 "2022-08-25T18:18:47Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![nathan.guessetto](https://avatars.discourse-cdn.com/v4/letter/n/a9adbd/32.png) [@nathan.guessetto](https://community.pix4d.com/u/nathan.guessetto)\
**Post date:** [August 25, 2022, 6:18pm UTC](https://community.pix4d.com/t/processing-area-and-merging-two-projects/23693/1 "2022-08-25T18:18:47Z")

</div>

I have a large area I have mapped with a Phantom4Pro RTK. I have processed the area in two seperate files and plan to merge them. I am going to use a processing area on both projects to trim out the area I dont need. I was wondering at what point do I add the processing area to each project? I have run step 1, added my GCP and manual tie points for the merge. After I have reoptimized both projects do I add the processing are to each one, then move forward with the merge? Thank you, Nathan

---

<div class="post-metadata">

**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 26, 2022, 11:54am UTC](https://community.pix4d.com/t/processing-area-and-merging-two-projects/23693/2 "2022-08-26T11:54:43Z")

</div>

Ciao @nathan.guessetto,

Welcome to the Pix4D Community 😉.

If you want to combine two projects, it is important that you have enough overlap between them.  
You can find more information about merging projects here:

> **[How to merge projects](https://support.pix4d.com/hc/en-us/articles/202558529-How-to-merge-projects)**
>
> It is possible to merge projects for which step 1. Initial Processing has already been completed in Pix4Dmapper. This allows the combination of information from different projects into one single...

I suggest you add the processing area for the entire project after you merge the two sub-projects.  
In fact, the processing area has no effect on the results of step 1, as explained here:  
[https://support.pix4d.com/hc/en-us/articles/202560179-How-to-use-a-processing-area-in-Pix4Dmapper#label1](https://support.pix4d.com/hc/en-us/articles/202560179-How-to-use-a-processing-area-in-Pix4Dmapper#label1)

Please let me know if there is anything else that I can do for you.

---

<div class="post-metadata">

**Author:** ![Chris\_Putnam](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/chris_putnam/32/4946_2.png) [@Chris\_Putnam](https://community.pix4d.com/u/Chris_Putnam)\
**Post date:** [August 26, 2022, 11:10pm UTC](https://community.pix4d.com/t/processing-area-and-merging-two-projects/23693/3 "2022-08-26T23:10:38Z")

</div>

Merge them first. The data you’re trimming in the “merge area” will only help to bolster your datasets when you rematch/optimize. Draw a processing area after you merge the projects. Then Rm/optimize. Don’t forget to check to ensure that your processing options, output coordinate systems & GCP coordinate systems are identical!