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Table 5 Comparison of travel time with Euclidean and friction surfaces methods

From: Improving geographical accessibility modeling for operational use by local health actors

Time estimation methoda Sample of fieldwork routes (N = 168) All routes (N = 41,426)
Absolute difference (minutes) Relative difference (%) PHC CHS
Absolute difference (minutes) Relative difference (%) Absolute difference (minutes) Relative difference (%)
Fieldwork Reference Reference
OSRM + statistical model 3.6 4.27 Reference Reference Reference Reference
Euclidian distance + 5 km/h speed 31.22 40.5 47.54 36.89 13.27 34.47
Friction surfaces + custom speed values 22.57 29.81 26.31 19.88 7.86 25.35
  1. aAbsolute values are used to allow for consistent average estimations. The distribution of differences (with signs to reflect underestimation or overestimation) is shown in Additional file 7