Reality Capture Field Procedures
      Back to home
      1. Welcome to the Global Survey Knowledgebase
      2. Reality Capture
      3. Reality Capture Field Procedures

      Mobile laser scanning data capture guide

      Before you begin

      • Draw up a plan of your project so that you can hit the ground running in the field
      • Plan the entire scan path including multiple passes
      • Clean the path of obstructions
      • Fix all the doors if possible (in case of a building capture)

      Example Scan Plan

      mobile scan plan

      Scanning - General Mobile Capture Tips

      • Move at a constant speed and avoid sudden swerves, avoid extreme slow speeds
      • Keep the length of missions as short as possible (5 – 10 mins) as the accuracy of the scanners trajectory will worsen with time
      • Multiple passes provide a check on the accuracy of the scanner trajectories and help fill in areas shadowed by moving objects

      blk2go

      Scanning - BLK2GO Capture Tips

      • Scan density is a function of the walking speed. Slow down to capture finer details and to help the SLAM algorithms in challenging environments
      • When moving through areas without structures within maximum range of the scanner (25m) consider placing objects to help the SLAM algorithms. E.g. in long corridors

       

      pegasusScanning - Pegasus Backpack Capture Tips

      • The mission should start and finish in exactly the same place. Use the base plate provided
      • Plan ZUPTS locations as part of the mission planning
      • Some environments, such as long hallways, tunnels and stairs can be more challenging for the SLAM algorithms. Consider the use of targets to aid in these areas – create custom targets here: https://tlstarget.com/index.html
      • A ZUPT (Zero Velocity Update) is a static phase of 20 seconds that needs to be performed every 2 minutes of capture and for every floor change (before and after stairs)