Earth Imaging Journal: Remote Sensing, Satellite Images, Satellite Imagery
Breaking News
Demonstrating Geospatial Value is Key to Regaining Public Trust in Experts says UN-GGIM: Europe
Momentum created by the 2030 Development Agenda and 2020...
Caroline Bellamy Appointed New Chief Data Officer of Ordnance Survey
Ordnance Survey (OS) is pleased to announce the appointment...
UNITAR-UNOSAT and Radiant.Earth Partner for Greater Impact from Earth Observations
The United Nations Institute for Training and Research (UNITAR),...
Insitu Announces High Accuracy Photogrammetry Payload for Broad Aerial Survey
COSTA MESA, Calif. - Insitu today announced the successful integration...
PDF3D V2.14 Release Meets Demands of Drones, Scanners and 3D Design Applications
PDF3D, leaders in 3D PDF conversion software, have today...

What are the effects of the “angle between images” setting in circular missions when it comes to 3D reconstruction?

Knowing which drone flight plan to design for 3D modeling can be challenging, but the good news is that Pix4Dcapture has automatic flight missions optimized for different scenarios. We tested circular missions with three image angle overlay variations in order to compare results.

Circular missions are recommended to 3D map a single object of interest, like a building or a monument.

When it comes to circular mission settings, DJI drone pilots can choose the angle between images. By dividing the 360° flight covered by the drone into sections, or variable angles (4°, 8°, 12°), the drone is told by the app to shoot a picture when it reaches the predefined angle. At a practical level, this means that at a low angle value (e.g. 4°), the drone will take more images and have a bigger image overlap than a higher angle value (e.g. 12°).

For this test, we flew the three missions around a building with a base of 30 x 30 meters and height of 18 meters, using a DJI Phantom 4.

Each mission had a different value for the “angle between images” setting; we tested capturing images with 4°, 8° and 12°. As constant factors, the flight altitude was 40m and the data was processed on Pix4D Cloud.

Circular mission with 4° angle between images

 

  • Flight time: 9 min
  • Number of images: 124
  • Cloud processing: 35 min 23 sec
  • Average GSD:84 cm / 1.12 in

 

 

Circular mission with 8° angle between images

  • Flight time: 5 min 44 sec
  • Number of images: 62
  • Cloud processing: 17 min 23 sec
  • Average GSD:87 cm / 1.13 in

 

 

 

Circular mission with 12° angle between images

  • Flight time: 4 min 29 sec
  • Number of images: 31
  • Cloud processing: 10 min 8 sec
  • Average GSD:11 cm / 1.22 in

 

  

So, how do I choose the angle between images in circular flights?

 

To answer this question, it’s important to define the goal of your 3D mapping project and keep in mind time and quality constraints.

By using a higher overlay level, there is more image information for the software to reconstruct an object, resulting in a more detailed 3D model. However, more data implies more time spent flying and acquiring images, and also a longer processing time.

Depending on the purpose of the 3D model, managing the angle between images helps balance time and quality: allowing you to choose from faster and more schematic reconstructions, to more detailed ones.

So, what are your project goals and constraints?

 

Comments are closed.