Application of Airborne LiDAR to the Determination of the Height of Large Structures. Case Study: Dams
Keywords:airbone LiDAR, low density LiDAR, dam height, accuracy
The best way to determine the height of dams is to level the top of the dam applying a geometric leveling, nevertheless this task is very demanding and expensive. The accuracy potential of LiDAR data has significantly improved, these systems can provide accuracy about 2-3 cm level, which could be enough to be applied in the determination of the height of dams. The point acquisition density is an important factor that is involved in the process of determining the height using LiDAR technique. Finally, due to LiDAR technique is based on ellipsoidal heights, it is necessary to transform the coordinates to the official orthometric system. This paper shows the results obtained using low density airborne LiDAR data (0.5 pts/m2) and their validation with post-processed GPS observations. Test results have shown LiDAR can be accurate enough (10-25 cm) to determine the height and to be applied in many civil engineering activities.
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