Processing Steps in Constructing Scaled Model of BP2_40: -Compiled by P. dePolo Workstation: SAMSON (geos-d-0901.geos.ed.ac.uk), Airborne Geosciences, University of Edinburgh Program Used: Agisoft Photoscan 1.2.5.2735 (64-bit, Professional Edition) 64 photographs used for model construction (images DSC_0134.jpg - DSC_0197.jpg inclusive). The images used to construct the photogrammetric model were captured using a 24.2 MP Nikon D3300 Digital SLR camera with an 18-55 mm VR II lens. -The photographs were captured in the field and the lighting conditions were diffuse as the day was cloudy. When photographs were imported into Agisoft, the tool 'Estimate Image Quality' was used. All photographs were above a threshhold value of 0.5 and were used. Preliminary Photo Alignment: Workflow -> Align Photos Settings: Accuracy = Medium Result: 64/64 cameras were aligned. Scalebar Construction: The pen (length of 15 cm) was used to scale this model. Two markers were created (pen_tip and pen_end) and checked at the pixel level in every photograph in which they appeared. A scalebar between the marker points was then created in the Reference pane and the length (15 cm) was specified. The camera positions were then optimized using the constraints imparted by the scale bar. 46,748 tie points resulted. Point Cloud Construction: Workflow -> Build Dense Cloud Settings: Quality = High Result: Dense cloud of 22,788,488 points resulted *The bounding box was set to closely fit the relatively flat plane in which the track occurred. This resizing of the bounding box excluded a negligable number of the points generated in the dense cloud. Mesh Construction: Workflow -> Build Mesh Settings: Surface Type = Arbitrary Source Data = Dense cloud Face count = High Result: Mesh with 4,557,589 faces *As the data set was small and the resulting model was both manipulable and manageable, the edges of the model were not trimmed and the data were not further modified. The dense cloud was exported as .obj and .ply files. The model was exported as .obj, .ply, and .stl files.