S, in order to reduce it (Supplementary file).The photographic survey was carried out by three shooting modes (i) making use of the camera using the mm lens, mounted on a telescopic rod at m above the testpits, so that you can record each testpit, too because the spatial connection in between testpits; (ii) utilizing the camera freehand together with the mm lens, in an effort to obtain added shots of each and every testpit; and (iii) applying the camera close towards the ground using the mm lens, in an effort to acquire detailed subareas.A lot more than , pictures have been taken, for any total of about GB.Information processingData processing began by checking measurements in plan and height.This step is preliminary towards the definition from the handle point coordinates.The trilateration strategy was applied to obtain x,y coordinates on the handle points in program.For each testpit, six measurements had been taken in the identical height the length from the 4 sides from the perimeter and also the length with the two diagonals.Redundant measurements had been applied to compute the PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/21493333 errors.Along with a preliminary graphical manage by CAD software (Autodesk AutoCAD), the automatic calculation computer software MicroSurvey STARNET was applied to adjust, by least squares approach, a new set of x,y coordinates and heights of your manage points (Supplementary file).The report offered by the software program shows that the residues of adjustments never exceeded mm (Supplementary file), which is a fully acceptable figure taking into consideration the size of your testpits.As soon as the adjusted x,y,z coordinate of all the control points (Supplementary file) have been computed, we utilised them to scale and locate in the D space the D models constructed by the Structure from Motion technique (see beneath).The images were initially calibrated to reduce lens geometric Isorhamnetin site distortion, and tone adjustment was applied in order to homogenize them and to reduce the effects of different lighting circumstances for the duration of shooting.Subsequently, the application Agisoft Photoscan was employed to create D spatial information starting from the pictures, by way of the following phases (i) alignment in the photos; (ii) creation on the dense point cloud; (iii) transformation from the dense point cloud into a surface (mesh); (iv) application of your texture for the mesh (Supplementary file).A series of orthophotos (with and without having textures) have been extracted from the D models (Figure figure supplements , and and Figure figure supplement).A check on dense point cloud density was also carried out by CloudCompare, software for D point cloud and triangular mesh processing (Figure figure supplements , and and Figure figure supplement).Digital survey of your cast of the G and GG trailsAt the finish on the September field season, we also surveyed a firstgeneration fiberglass cast of the southern portion from the Internet site G trackway (about .m in length) (Figure) kept at the Leakey Camp at Olduvai Gorge.The cast contains the following tracks in the path of walking G, , , , , , , , , around the western side and GG, , , , , , , , , and on the eastern side.Information acquisition and processing (Supplementary file) were performed following the workflow described above for the Web page S testpits.We positioned four perimeter control points and inner targets.The latter had been used to model in detail six selected tracks (GG, G, G, G, G and G, listed within the direction of walking) (Figure figure supplement).Morphometric evaluation Morphometric information acquisitionThe D data obtained by the aboveexplained procedures had been also employed within the morphometric analysis of your hominin tracks.