Besides lighting situations during image acquisition choice of GCPs is

Fig. 9. Profiles of headcut 1 and 2 illustrating surface changes from November 2013 (dashed line) till February 2014 (solid line).Figure optionsDownload full-size imageDownload as PowerPoint slide
The illustrated profiles display AZD2858 representative example of many possible cross-profiles of meshed 3D surfaces. Hence, further evaluations were necessary to assess multi-temporal changes comprehensively. A visualisation of local erosion- and accumulation-areas was performed by calculating 3D changes of the two campaigns. Fig. 10 shows fitted plane and the darker area emphasise the area under which the volume was calculated. In headcut 1 the gully front is energy flow very flat and was therefore difficult to define. In contrast, headcut 2 is characterised by a clear terrain edge (cf. Fig. 10 upper images).
Fig. 10. 3D volume calculation. Upper images: Fitted plane in meshed headcut 2 model (left: oblique view; right: plan view). Lower images: 3D volume changes analysis of headcut 1 (right) and headcut 2 (left) calculated from meshed point clouds (Nov 2013 vs. Feb 2014).Figure optionsDownload full-size imageDownload as PowerPoint slide