Planning

Collection

Processing

Quality Control

Deliverables

Mobile LiDAR Best Practices

- Planning

- Panel and Validation Point Spacing and Placement

- (Dependent on road type, conditions & req’d accuracy)- (Between 500 and 2500 feet)

- GPS Conditions (avoid outages & poor DOP)

- Traffic Volumes (avoid rush hours)- Plan Travel/Collection Routes- Plan GPS Base Location(s)

- Collection

- Blocker Vehicle or Not- Vehicle Calibration / IMU Wake-Up- Follow Travel/Collection Routes in Google- Earth- Speed (panel sizes/end product)- Avoid Stop and Go- Limit Collection Routes to Manageable Lengths/File Sizes

(within 10 to 20 miles)- Use base station within 5 to 7 miles of project- Survey Control

- VRS for Horizontal & Digital Level for Vertical

- Processing- Reduce/Localize Control- PosPac – GPS Trajectory- Register Trajectory, Point Clouds, Cameras

to Final Panel Control- May use some validation points for

registration- May use cloud to cloud registration in

some areas

- Quality Control

- LiDAR Processing Software- Run Surface Confidence Check (Point Cloud to

Validation Points) / RMSE Report- May Constrain to Validation Points if Needed

- Client Software- Geppak, AutoCad, TopoDOT, Geocue

- Run 0.10’ contours on surface- Compare Original Point Cloud Contours to Point Grid

Contours to Point Grid + 3D Breaklines Contours- Compare to Aerial or Other Avail. Line Work

Deliverables - Uses for 3D Point Cloud Data…

Detailed As-Built InformationBasis for DesignTopographic MappingPavement DTMGIS Feature InventoriesChange Detection (Mesh to Point Cloud Comp)Volume Surveys2D or 3D Mapping

Keys to a Successful Project

• Determine the Level of Detail• Determine the Accuracy of the Primary Delivery• Collect once – use many– Fidelity of the data during collection– Archive Everything

• Know the Client’s 3D aptitude– IT Infrastructure (can their computers handle it)– Personnel– End User (is it an engineer or a dozer operator)