Your Range and Angle Gate can be adjusted in ROCK Desktop when processing your trajectory. Here's some more detail for those settings.
Understanding Range Gate
The range gate is described as the distance from the sensor, which is related to your flight height. For instance, if a mission was collected at 45 meters above ground level, you want to ensure your range gate has a maximum value greater than 45 meters. The default range gate settings in Rock Desktop are set to 8 meters and 65 meters.
Key Points:
- Default Settings: 8 meters (minimum) and 65 meters (maximum).
- Recommended Range: If your goal is a final dataset with survey grade accuracy, ROCK recommends that you use a range gate of 8-65 meters.
- Adjustments: If flown at higher altitudes (e.g., 100 to 120 meters), adjust the range gate accordingly so your maximum value is greater than your flight height.
If the range gate is set too low, not all data may be captured. For example, if your mission was flown at 45 meters, ensure the maximum range gate is set above this height for full data coverage. For more information on recommended settings visit Creating a Mission Plan.
Understanding Angle Gate
The angle gate is related to the field of view for your ROCK LiDAR unit. By default, this is set from -30 to +30 degrees. You may want to expand the angle gate due to the presence of tall objects like powerlines or a vertical structure. However, the highest quality data will be present where the field of view is closest to zero degrees (straight down).
Key Points:
- Default Settings: -30 to +30 degrees
- Expanding the Angle: If tall structures or powerlines are present this may be necessary. Allows more data points but may reduce data quality.
- Project Knowledge: The person processing the data should have a full understanding of the data collection settings project goals. These factors should be considered when determining the settings for processing the LiDAR data.
When expanding the angle gate beyond the default settings, you allow more data points to be included in the processing. However, the quality of these points may be reduced.
ROCK Desktop Use
Here’s how you can adjust these settings in ROCK Desktop for Trajectory Processing:
- Range Gate: Ensure the maximum range is set above the flight height.
- Angle Gate: Keep within the recommended -30 to +30 degrees for optimal data quality. However these values can be adjusted depending on what you are trying to see in your LiDAR dataset.
If you have any questions or comments about this, feel free to reach out to us at support@rockrobotic.com.