Using Gigapan and LiDAR as supporting tools when analyzing Rockfall hazard in Norway

摘要

Development in remote sensing has opened up new techniques to map and quantify rockfall in massive rockfaces like those in the western Norwegian fjords. Gigapan photogrammetry enable the visualization of the entire slope in detail with the ability to zoom into the image to see individual features. The terrestrial LiDAR scanning gives the possibility to quantify the findings in the Gigapan photos. In Lyseboten this technique was used with success, and 19 rockfall sources threatening the construction site of Lyse's new electrical power plant was identified. Prime lenses with long focal length targeted the size and distance to the rockface should be used when shooting the Gigapans. Care should also be taken when selecting scanning positions to avoid wind and other factors that could influence on the data quality.