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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

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Mobile LiDAR Best Practices

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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


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

Deliverables - Uses for 3D Point Cloud Data…


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)


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