Learn how to plan the mapping of cities for optimal results with your WingtraOne.
When processing aerial images of buildings or other elevated structures, you might notice distortions near edges in your orthomosaics or DSMs. The altitude of points at the edges of buildings are more prone to errors, resulting in altitude differences between points at the same altitude. The errors are transferred from the point cloud to the orthomosaic.
Try these tips to help reduce such distortions in your deliverables.
Flight planning
- Increase the flight overlaps. If you are already flying with the default 70% side overlap, try increasing to 80%. You can also increase the front overlap, but do not set this too high, as it can result in missing triggers. If you increase the front overlap, check for warnings in WingtraPilot to ensure that your flight does not miss images.
- Set up the flight plan with two overlapping areas with flight lines running perpendicular to each other over the area of interest ("cross-hatching").
- Fly on a bright but overcast day to avoid the influence of shadows. Shadows darken areas and reduce visibility of distinctive features in your images.
Photogrammetry processing
- Select the recommended settings for 3D reconstruction.
- Edit your outputs manually by removing noise in the point cloud to make sharper edges in the mesh and orthomosaic.
Generally, the tips above can be implemented with any photogrammetry software. Bentley ContextCapture is our recommended solution for the creation of digital twins based on 3D mapping with the Oblique Sony a6100. For more information, you can refer to our case study on creating a digital twin of the city of Zurich.