Transmission Corridor Mapping

In order to meet the multifaceted challenge of providing a safe, reliable energy supply servicing markets with constantly growing demands, it is critical for utility companies to maintain existing infrastructure today while looking ahead and planning for new power line corridors to meet future growth. This requires accurate and timely surveys of current infrastructure and assets as well as surveys for deployment of future infrastructure. 

LiDAR (Light Detection and Ranging) is technology developed for creating highly accurate, three-dimensional surveys of terrain, vegetation and electric utility infrastructure. Close-range LiDAR data is classified as having the sensor positioned at distances ranging from 500' to 1,500' from the features to be acquired. The acquisition for modeling can be accomplished from the air or ground. Close-range aerial LiDAR is typically collected from a helicopter platform and can yield x,y,z point densities of 25 to 40 per square meter. Static terrestrial scanners and kinematic mobile mapping systems collect the LiDAR data and image data from ground perspectives at densities ranging from 500 to 2000 points per square meter. These LiDAR collection technologies can be deployed independently, or in tandem for effective electric transmission corridor mapping. 

3D Modeling & Engineering Analysis 

Sanborn utilizes the latest Lidar data acquisition technology for modeling overhead lines, structures, terrain and vegetation features. The features will be extracted from the point clouds so electric engineers can model and calculate line ratings, element sag and tension using the surveyed conductor positions. Three-dimensional engineering models will be constructed from actual field "as built" surveys that precisely map the relationship between all of the natural and manmade utility ROW features. In addition, various weather combinations including wind, barometric pressure and temperature will be captured during the mission to support the building of PLS-CADDTM Method 1 models for analysis including:

  • Stringing and graphically sagging the wire to match the surveyed wire points at its rated temperature
  • Survey Point Clearance reports for each circuit or line segment.
  • Perform engineering analysis and calculations including:
    • Maximum operating temperature for each circuit.
    • Circuit summary on a span-by-span basis
    • Minimum clearance to terrain surface
    • Survey point clearance reports, wire blowout, insulator swings, maximum sag condition