Drift Error - Analysis
Scenario 2 - Incremental Distancing
Upon observing the 18 points as depicted in Table 2 above, an analysis was completed to
assess the coordinate error of the TCH model viewer. Here, differences were calculated
between the observed model coordinates and the actual plan coordinates thereby providing
horizontal, vertical, and positional errors seen below in Table 5.
Pt Name Distance Hz (m) Vt (m) 3D (m)
1 0 0.015 -0.003 0.015
2 0 0.010 0.000 0.010
3 0 0.016 -0.001 0.016
4 5 0.023 0.000 0.023
5 5 0.026 0.000 0.026
6 5 0.024 0.002 0.024
7 10 0.032 -0.001 0.033
8 10 0.036 0.000 0.036
9 10 0.037 0.000 0.037
10 20 0.066 0.002 0.066
11 20 0.065 -0.001 0.065
12 20 0.063 0.008 0.064
13 30 0.089 -0.003 0.089
14 30 0.088 -0.001 0.088
15 30 0.088 0.001 0.088
16 50 0.206 0.001 0.206
17 50 0.200 -0.009 0.201
18 50 0.207 -0.005 0.207
Table 5: Error by Point (m)
A statistical breakdown of these errors for both solutions can be seen below in Table 6.
Noticeably, by integrating WLT the TCH model viewer performed significantly better, offering an
average positional error nearly 3.5x more accurate than when WLT is not integrated.
WLT Integrated WLT Not Integrated
Statistic Error (m) % by Distance Error (m) % by Distance
Average 0.072 0.37% 0.245 1.14%
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