Author Archives: perpalaa

Vat GIS

3-D Map of Vatnsskarð Pillow Ridge Quarry, Iceland

A quarry at Vatnsskarð, which is part of the Krisuvik fissure system in southwestern Iceland, provides exceptional exposures of the stratigraphy and insights into the formation processes of a glaciovolcanic, pillow-dominated tindar. The active part of the quarry is ~0.5 km wide and 0.7 km long, while the overall width of the ridge at this location is ~1.2 km. This project aimed to examine the stratigraphic relationships at the quarry by creating a 3-D map of the quarry using GPS data points and high-resolution photographs collected in the field. Mapping these types of quarry features is useful in that we can learn something about sub-glacial pillow ridge formations. Having a greater knowledge of how these volcanic features are formed can be beneficial to communities that live around areas where there is volcanic activity under glaciers. The creation of an entire ridge from one single event would create significant ice melting and consequently extensive flooding; however, if these ridges are formed from a series of events, then there would likely be less danger to the surrounding communities.

The original objective of the project was drape a GigaPan image of the quarry over the bare map to render a realistic image of the site, thereby facilitating a more detailed and accurate interpretation of the site. Using the GPS point cloud data, a 3-D map of the quarry was created. The GigaPan image; however, was not draped over the 3-D because of difficulties in accomplishing this task in ArcScene program. We also attempted to geo-rectify the GigaPan image, but this also was not successful due to an inability to identify accurate control points in both the image and map. The results of this project would suggest more detailed field mapping must be accomplished in order to super-impose high-resolution imagery over a 3-D map using the ArcGIS toolsets.3-D Map of Vatnsskarð Pillow Ridge Quarry, Iceland