EuroSDR Projects - Host Ireland

In building length determination (Figure 4-14), laser based methods were not as accurate as
photogrammetric methods, as could be expected from the above. The photogrammetrically derived
lengths varied from 14 to 51 cm (RMSE, mean 26 cm, median 22 cm, std 12.6 cm). Lengths obtained
with aerial image assisted laser scanning varied from 19 to 108 cm (mean 59.4 cm, median 57 cm, std
31.2 cm). The laser scanning based lengths varied from 13 to 292 cm (mean 93 cm, median 84.5 cm,
std 60.9 cm). With laser scanning the complexity of the buildings was the major cause for site wise
variation rather than the point density.
4.2.4 Roof Inclination
Roof inclination accuracies of different models are shown in Table 4-20 (Hermanni), Table 4-21
(Senaatti) and Table 4-22 (Amiens).
All Cyber- Stutt-
ICC
laser+ Nebel+ ICC
C+B
FOI
observations City gart IGN aerial Partner laser Delft Aalborg Technik Dresden outlines FOI
N 17 17 17 17 17 17 11 16 12 3 12 15
Min -2.41 -2.38 -1.57 -1.49 -2.38 -1.49 -1.15 -0.93 -5.29 0.03 -1.48 -1.67
Max 4.30 5.54 1.78 0.34 0.32 0.41 0.72 0.83 -0.36 0.45 0.52 0.46
Median 1.16 1.09 -0.16 -0.38 -0.33 -0.32 -0.42 -0.18 -2.22 0.32 -0.68 -0.70
Mean 0.95 1.27 -0.07 -0.38 -0.51 -0.34 -0.29 -0.15 -2.58 0.27 -0.52 -0.61
STD 2.02 2.62 1.01 0.52 0.73 0.58 0.60 0.54 1.65 0.22 0.59 0.54
RMSE 2.18 2.84 0.99 0.63 0.88 0.65 0.64 0.55 3.03 0.32 0.77 0.80
IQR 3.01 5.10 1.85 0.71 0.89 1.17 0.62 0.87 3.34 0.29 0.59 0.55
R 2 Outliers
removed
0.7701 0.6559 0.9419 0.9851 0.9714 0.9814 0.9565 0.9805 0.7927 0.8592 0.9728 0.9823
N 16 0.14
Min -1.95 -1.27
Max 0.32 0.46
Median -0.30 -0.68
Mean -0.40 -0.53
STD 0.57 0.47
RMSE 0.68 0.70
IQR 0.50 0.62
Table 4-20: Hermanni roof inclination accuracy in degrees.
All Cyber- HamStutt- ICC
laser+ Nebel+ ICC
C+B
FOI
observations City burggart IGN aerial Partner laser Delft Technik Dresden outlines FOI
N 10 9 6 8 9 9 5 4 2 3 2 6
Min -2.00 -7.16 -4.00 -2.42 -2.12 -4.24 -3.10 -1.34 -22.10 -1.02 -2.61 -2.55
Max 1.31 2.65 6.49 2.27 0.46 0.57 0.32 0.42 -4.38 0.36 -1.09 0.03
Median -0.23 -2.29 0.72 -0.22 -0.17 -1.00 -1.99 -0.37 -13.24 0.24 -1.85 -0.72
Mean -0.20 -2.52 0.80 -0.14 -0.61 -1.41 -1.51 -0.41 -13.24 -0.14 -1.85 -0.95
STD 0.98 2.93 3.76 1.95 0.99 1.89 1.37 0.93 12.53 0.76 1.07 1.04
RMSE 0.95 3.74 3.52 1.83 1.12 2.27 1.95 0.91 15.93 0.64 2.00 1.34
IQR 1.44 4.07 5.07 3.28 2.02 4.55 2.54 1.70 17.72 1.25 1.52 1.69
R 2 0.9741 0.7699 0.8233 0.9498 0.9765 0.9392 0.9675 0.7406 1.0000 0.9904 1.0000 0.9708
Table 4-21: Senaatti roof inclination accuracy in degrees.
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