This is an area which was not possible with conventional topographic data techniques and where the LiDAR data are being used most. The LiDAR pulses get reflected highly from the wires of transmission lines thus generating a coordinate at the wire. Multiple returns produce data for different story of wires. In addition, LiDAR also captures the natural and artificial objects under and around the transmission lines (Figure 26). This information is extremely useful for knowing tower locations, structural quality of towers, determining catenary models of lines, carrying out vegetative critical distance analysis and for carrying out repair and planning work in a transmission line corridor Figure 26.
Figure 26: Transverse section of a transmission line using LiDAR data (Courtesy Toposys)
There are many more application areas for LiDAR data e.g., Creating realistic 3D environment for movies, games, and pilot training; Simulation of Hurricane movement and its effect; Simulation of Air pollution due to an accident or a polluting source; Transport of vehicular pollution in urban environment; etc. Basically, all those application areas where topographic data are fundamental can benefit with LiDAR data. LiDAR instruments are also being used for extra-terrestrial mapping (e.g. MOLA, LLRI)