US: The Florida Department of Transportation, US, has released, ‘Terrestrial Mobile LiDAR Surveying & Mapping Guidelines’. The guidelines focus on three major application categories of Terrestrial Mobile LiDAR (TML).
Type A is for high accuracy surveys such as design engineering and structures and bridge clearance. Type B is for medium accuracy surveys such as detailed asset inventory and environmental and Type C is for low accuracy projects like preliminary planning and transportation statistics.
The report further listed certain key factors to consider while determining if TML is appropriate for a particular project. Key factors include; Safety, Project deliverables desired, Budget, Project time constraints, GNSS data collection environment, Terrain and length/size of project and traffic volumes and available observation times.
All of the equipment in the TML system used to collect, process, and adjust data must be of sufficient precision to meet the accuracy requirements of the project and applicable accuracy standards.
The report further suggested that in order to maximise the quality and production of measurements, mission planning should be conducted before the collection of TML project data commences.
During a TML data collection mission, simultaneous GNSS signals from a minimum constellation of 5 satellites should be maintained between at least one GNSS Base Station receiver, and the GNSS roving receiver(s).