Vertical shift between flight blocks /EXIF file. I'm lost!!

hi,

i use drone P4P for 1km2 mapping

i have 30 mission(flight)

i use 5 GCP's.

I use the same GSPs coordinate system (WGS84).

i make good over lapping between flights.

i fly 40m altitude 1GSD.

i follow the right workflow as per your instruction of website which:

1- run initial step for each mission separably. (here i check quantity report, i have 1 block created for each mission).

2-marge the sub project in one project. (here i check quantity report, i have 8  block created for each mission and virtual shifting around 50m).

3- Mark GCPs.

4-Re-optimize (here i check quantity report, Its same i have 8 block created for the project).

This is the first result !

 

i try something different as following:

 

1- run initial step for each mission separably. (here i check quantity report, i have 1 block created for each mission).

2- add MTPs for sub project and reoptimize 

3-marge the sub project number 1 to sub project number 2 in one project . (here i check quantity report, i have 1 block created )

4- add MTPs for merged project 1+2 & reoptmize.

5-then i marge sub project number 1+2 to sub project number 3 , and 1+2+3 to 4 all by using MTPs....So that for 30 mission 

6- I Mark the GCPs.(here i check quantity report, i have 1 block created )


7-Re-optimize (here i check quantity report, Its same i have 1 block for the project).

This is the second result ! but it take long long time !! (Where I tried to put MTPs on each optimized sub project and marge them one time but still i have multi blocks.  

 

after asking some Pix4d users they said

" if you using GCPs remove the geolocation from the photo because the initial geolocation on the photos is highly inaccurate in comparison to the GCPs, the mismatch in between the blocks should be corrected once your remove  the EXIF file data from image,, So the correct workflow will be as follows :" 

1.do your initial processing with the geolocation on.
2. Mark gcps
3. Remove exif data
4. Reoptimize
5. Check for accuracy
6. Continue to process next steps

The quote ended.

Now i do not understand that and i don't know how to do that and i don't if that is the right workflow. what you say about that.

and kindly inform me if there and setting i should do on my drone P4P before starting the mission, because i do nothing only run pix4d mapper and change the mapper software setting it self.

 

Thanks

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