Abstract
In this study we examined how a GIS-based viewshed analysis that integrates movement could be used to provide substantial knowledge about the placement of Bronze Age grave cairns along the coast in a study area in Brunlanes, Larvik in South-East Norway. Additionally we studied the significance of digital elevation model quality for the interpretation of the viewshed analysis and for encluding palaeo-environmental changes (uplifting of land) in the analysis. Two sets of viewshed analyses were carried out from seven potential sailing routes based on a 20-metre and one-metre resolution DEM. The results indicate that the grave cairns were placed on the skyline in order to stand out more clearly to observers approaching from the sea, and that the DEM quality is of importance for the interpretation. Taking palaeo-environmental issues into consideration, we found that the effects of the uplifting of land were proven to affect visibility whereas vegetation was not an obstacle.
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