Noise Detection

Menu: Analyze / Noise

The Noise Detection tool identifies and classifies isolated points as Class 7 (Low Points / Noise), following ASPRS standards.

⚠ Important:

• This algorithm only detects isolated points—points that are significantly distant from any others.

• Moving objects (e.g., cars in motion) and surface noise will not be detected due to their higher point density.

1. Noise Detection Settings

Minimum Points per Cell

• Defines the threshold for classifying a cell as noise.

• If the number of points in a cell is below this threshold, the cell is marked as noise.

Minimum Cell Size (in distance units)

• Defines the tile size for processing.

• Smaller values improve accuracy but increase processing time.

• The cell size must be smaller than the project cell size, or else the default project cell size will be used.

  • Project cell size information is available in File → Project Info.

2. Processing Area Limitations

Starting Point

• Defines the initial point for classification.

• Can be:

  • Manually set by entering coordinates.

  • Picked from the point cloud using the "Pick" button.

• For best performance, select a known isolated point to reduce processing time.

• If Limit by Radius is enabled, detection will be centered around this point.

Limit by Radius (in distance units)

• Restricts processing to a circular area centered on the starting point.

• Useful for testing parameter settings or processing specific areas separately.

3. Statistical Noise Removal

Use Statistical Removal

☑ Enables statistical noise filtering

• Analyzes nearby points in neighboring cells before classifying noise.

• Prevents the misclassification of small clusters of points at the extremities of a larger point group.

• ⚠ Enabling this option increases processing time.