LiDAR QA/QC in a Production Environment

1. www.merrick.com
LiDAR QA/QC in a Production Environment
June 14, 2018
UF/IFAS Mid-Florida Research and Education Center
UF/FL-ASPRS Spring LiDAR Workshop
www.merrick.com
Matt Bethel
Director of Operations and Technology
matt.bethel@merrick.com
303-353-3662

2. OUR PURPOSE FAST FACTS
Founded in 1955 by Sears Merrick and Ed Lecuyer
Employee-owned with 550 employees
Full-service, multi-disciplinary engineering and
architecture firm headquartered in Colorado
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Markets served: Energy, National Security, Life
Sciences, and Infrastructure
20 office locations
(17 in the U.S., 1 in Canada, 1 in Mexico, 1 in the U.K.)
RESPECT, INTEGRITY, SERVICE & EXCELLENCE.
We live our core values every day in how we work
together, stay true to our purpose, and pursue our vision.
SOLVING.
GROWING.
LIVING.
OUR VISION
Our family of employee
owners collaboratively
developing the right solutions
to better our world.
ABOUT
MERRICK

3. 20 OFFICE
LOCATIONS

4. Traditional Airborne LiDAR Workflow

5. Traditional Airborne LiDAR Workflow with QC Steps

6. Data Check
QC
Inputs:
• LAS swath files
• Project boundary
• Point density requirement
• Units selection

7. Data Check
QC
Output testing
reports:
• Returns
• Intensity
• Point density
• Data voids
• Spatial distribution
• Relative accuracy
• Sensor calibration
stability
• Channel to channel
alignment (if multiple
channel LiDAR system
was used)
• Data coverage
• System anomalies

8. MARS® QC Module
Data Check Report Example

9. Calibration
Check QC
Inputs:
• LAS swath or tiled files
• Project boundary
• Point density requirement
• Units selection

10. Calibration
Check QC
Output testing
reports:
• Measurable relative
accuracy
• Sensor calibration
• Channel to channel
alignment (if multiple
channel LiDAR system
was used)

11. MARS® QC Module
Calibration Check Report Example

12. USGS NGP
LBS 1.2 QC
Inputs:
• LAS swaths
• Classified LAS tiles
• Tile shapefile
• Project boundary
• Quality level selection
• LiDAR checkpoints (both
NVA and VVA)
• Units selection

13. USGS NGP
LBS 1.2 QC
Output testing reports
(Collection)

14. USGS NGP
LBS 1.2 QC
Output testing reports
(Data Processing /
Handling)

15. MARS® QC Module
USGS NGP LBS 1.2 Report Example