Orthomosaic in "strips" - Mavic Pro 2

PIX4Dmapper PIX4Dmapper Questions/Troubleshooting
1

Hello. This my first post on the forum. I recently flew two separate projects: For one I used Pix4D Capture App with a 3D grid, the other we flew a grid manually (unfortunately we didn’t have the app at that time). Both projects have unusable orthoimage outputs where there are “strips” of imagery with black spaces dividing them. If I look at the volumes tab in Pix4D mapper the results look much more “cohesive.”

Project 1 - “Manual” grid flight
Pix4D_proj1

Project 2 - Pix4D Capture App used
- As a new use I can only upload one file to the forum (see below).

  • Is this a Mavic Pro 2 camera calibration issue?
  • Is there anything I can do at this point?
  • How can I prevent this from happening in the future?

Thank you in advance for the feedback.

2

Here is a photo of Project 2:
Pix4D_proj2

3

HI @CK_FSLA,

Could you post here the Quality Report of your project? I can think of two causes of this issue. I would like to verify which one of those we are dealing with here. Thanks!

Regards

4

Hi. Thank you for the response. Attached are the reports. Let me know if you have any questions.

Project1_report.pdf (1.9 MB)

Project2_report.pdf (2.0 MB)

5

Hi,

Thank you very much for the reports.

The issue is related to camera calibration. I would suggest you change the camera shutter mode to Global Shutter and reprocess the project using the 3DMap processing template.

To change the Rolling Shutter for Global Shutter go to:

  1. Image Properties Editor.
  2. In the Selected Camera Model section click Edit.
  3. Click again Edit.
  4. Change the Shutter Model to Global Shutter or Fast Readout.
    image
    image761×749 25.3 KB
    .

I hope it helps!

6

Thank you. Trying this now. I will report back with the results. Are there any settings I should change on the drone itself or within Pix4D Capture to help make this smoother down the road?

7

So, I’m still processing (currently at step 3) Project 1 and anxious to see the results this is from the summary of the new report:

Camera Optimization
Camera Optimization807×43 10.5 KB

Is this concerning?

8

Hi!

It’s something that we have t work on :slight_smile: Could you please send us here the Quality Report of this new processing?

Best

9

Well the results look much better. I am having problems with the GCPs but I might start a new community thread for that since I assume it is a wholly independent issue. At least this is usable data now:

Pix4D_proj1_r2

As requested, here is the updated Quality Report
Project1_R2_report.pdf (1.5 MB)

Thanks for your help!

1 Like
10

Hi @CK_FSLA,

Thanks for following our best practices and posting a new issue as a separate topic.

I see that there are not many matches in the project. I think you could increase its density by selecting Use Geometrically Verified Matching in Step 1.

Best

11

Thanks. I will re-process and try to select that option. I think Pix4mapper may have gotten stuck at 51% calibration. It’s been at this point for hours. I am going to restart and try again
Pix4D_Calibrate

12

Hi @CK_FSLA,

Hm. I would suggest that you write us a ticket with Quality Report and the .log file attached. Definitely, the software does not work for you as expected. And we have to change that. :slight_smile:

Best!

13

Hello - Thank you for the response and for your help. I am still struggling with this project. The latest problem is that the software just seems to crash when I run the scan overnight. Very frustrating. I have created a ticket and uploaded the most recent quality report and log for the multiple attempts. Thank you.

1 Like