5.2. Contribution of the methodology
We based our comparative analyses on values for the strike and
dip parameters obtained using the three different data sets. The
results of the manual compass survey and the analyses of the 3D
point clouds obtained by laser scanning and dense stereo matching
were quite similar. However, the cluster corresponding to bedding
did not emerge from the compass survey data, whereas this cluster
was clearly identified by both the laser (cluster FL_1) and photogrammetric
(FP_1) methods. As mentioned in the structural interpretation,
the bedding has been affected by metamorphism and
fracturing, so it is not easy to measure bedding planes in the field. In
addition, bedding often occurs in inaccessible areas of the outcrop
(black dots in Fig. 10). The failure of the compass survey to detect
bedding discontinuities illustrates one of the drawbacks of traditional
methods based on single point measurement, as indicated in
the Introduction of this paper.