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 DSM 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 the flight and the processing need to be taken in 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: 202560349.
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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. | |