Milevis med LiDAR, Tønnevis med Tjære - LiDAR i jakten på myrmilene; en trøndersk spesialitet
Abstract
The aim of this thesis was to investigate how LiDAR could best be used to discover tar piles in bogs in Rennebu, Trøndelag, Norway. And further, what new historical and cultural knowledge could be gained from an extended LiDAR based survey of such tar piles. It was demonstrated that LiDAR could be used to find tar piles if the quality of LiDAR-data was above five returns per square meter, and if a suitiable visualisation was used. LIDAR targets were inspected in a field survey to control LiDAR accuracy. From this data, a model-based approach was used to estimate the total amount of tar piles in bogs in Sør-Trøndelag. From this estimate, a volume of yearly tar production was derived. This volume proved to have relations with tar export history, and this export correlated well with major historical events in Europe. Tar piles in bogs in Trøndelag, therefore, can be seen as a consequence of a rise in demand for tar that likely originated from these events.