Error
Some areas of the DSM have a lot of noise. Instead of representing correctly the area, the DSM has rough distortions / noise.
Description
The Densified Point Cloud and consequently the DSM, which is created based on this, has a lot of noise on specific areas.
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Figure 1. Noise on the DSM. |
Cause
This error comes from processing images with different light conditions. These images have different shades that confuse the algorithm and create noise.
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Shadow | No Shadow |
Figure 2. Different light condition between images. |
Solution
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:
- Add Manual Tie points on the problematic / noisy areas. For more information about how to add Manual Tie Points: How to import and mark Manual Tie Points (MTPs).
- Remove the noise from the Densified Point Cloud, as it is described here: How to remove noise from the point cloud.
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Before adding Manual Tie Points | After adding Manual Tie Points |
Figure 3. Improvement of the DSM after adding Manual Tie Points. |
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