Airborne LiDAR Scanning

Aerial Survey & LiDAR Scanning

 

Aerial Survey

Lidar

Promap utilize a Trimble Harrier 68i Aerial Imaging & Laser Scanning System. This system consists of a Riegl Q680i LiDAR laser scanner, a precise IMU and a digital, 60 mega-pixel, medium format camera. This system incorporates multiple turn-around functionality (MTA) allowing the sensor to emit a laser pulse before the last pulse has been received which allows for higher pulse repetition rates at low altitudes. This is a particularly useful dense vegetation penetration or mapping power line conductors etc. Designed for both aircraft and helicopter operation, the Trimble Harrier 68i is ideal for long-range corridor projects as well as wide-area mapping. The system incorporates a wide-angle, airborne laser scanner, enabling one to extract the most comprehensive information. The laser scanner’s 400 kHz effective measurement rate (at 60° scan angle) delivers high point density on the ground to provide detailed modelling data needed for precise planning, engineering and monitoring applications. The Trimble Harrier 68i allows flight at a typical maximum altitude of 1600 meters above ground level, resulting in a wider footprint coverage.

Lidar_installed

The system installed in the aircraft

 

Area or corridor based project configurations.

Advantages of applying LiDAR technology in corridor mapping

  • Fast data collection and processing (Can save up to 50% in time)
  • Fast turn-around time
  • High data accuracy and quality (survey-grade) whilst providing an advanced product.
  • Economical surveying technique – the longer the corridor the cheaper it gets!
  • Planning/Monitoring of inaccessible areas
  • Assessing Security and Environmental impacts can be integrated earlier in the process with no / limited field work – realising substantial time and cost savings.
  • Added benefits from the survey product can be derived for purposes of environmental and existing structural analysis, hydraulic – and/or flood simulations
  • Time and cost effective route determination for any infrastructure (powerlines, railways, motorways, gas and pipe lines)
  • The data can be acquired without interferences of road / rail traffic, property and difficulty accessibility
  • Flights can take place during the night (LIDAR data acquisition only)
  • Problem solving and decision making are simplified & facilitated.
  • Added value of a geo-referenced image to the laser dataset.
  • Ease of visualizing the relationships between planned and existing infrastructure and other man-made or natural objects.
  • True-ortho images can be used as maps to make measurements and establish accurate geographic locations of planned or existing infrastructure.
Flight plan

A typical area based flight plan coverage

Powerline Corridors

  • Soil erosion assessment
  • Powerlines risk management assessment
  • Identification and calculation of slopes changes for templating and design.
  • Capacity to predict actual and future areas prone to flooding
  • Ensures that the terrain’s morphology is good enough to meet the planning/construction requirements
  • Most advanced data to select the route planning and construction with the lowest environmental and economical costs
  • The type of the terrain, i.e. rocky, heavily vegetated, existence of water bodies.
  • Better definition of the failure surfaces, deformation patterns, and morphologies required for understanding failure modes.
  • High-resolution data for evaluation of analytical and numerical models of terrain deformations.
  • The accurate terrain measurements allow assessing the feasibility of construction in such places as, e.g.:
    • Valleys between mountains, hills and dunes
    • Identification and/or construction of access routes
  • Determine of 3D Co-ordinates on existing power-line features
  • Plan, manage, and maintain powerlines
  • Analyze the risks of transmission line sagging, tree interference, and clearance
  • Monitor vegetation growth and tree locations.