PlanningCollectionProcessingQuality ControlDeliverables Mobile LiDAR Best Practices.

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Presentation transcript:

PlanningCollectionProcessingQuality ControlDeliverables 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 Information Basis for Design Topographic Mapping Pavement DTM GIS Feature Inventories Change Detection (Mesh to Point Cloud Comp) Volume Surveys 2D 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)