Some areas of the DSM have a lot of noise. Instead of representing correctly the area, the DSM has rough distortions / noise.
The Densified Point Cloud and consequently the DSM, which is created based on this, has a lot of noise on specific areas.
|Figure 1. Noise on the DSM.
This error comes from processing images with different light conditions. These images have different shades that confuse the algorithm and create noise.
|Figure 2. Different light condition between images.
In order to solve the issue, both the flight conditions and the processing need to be taken into consideration:
- During flight: Try to fly with the same lighting conditions as much as possible, same hour of the day, same sun direction, same weather conditions etc.
- During processing:
|Before adding Manual Tie Points
|After adding Manual Tie Points
|Figure 3. Improvement of the DSM after adding Manual Tie Points.