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In general cases, the total RMS error should be controlled within one pixel on flat terrain and in hilly area, and should not exceed 2 pixels in mountain area.
In most situations, on flat terrain, users need to be able to walk to one stop, but not to two stops, so duplicate coverage is a waste.
"We don't go run miles on flat terrain.
Poles can be used on flat terrain as well for hill walking.
It could land big rovers or small, on flat terrain or sloped, in all kinds of weather.
UP AND DOWN HILLS Many people believe that cross-country skiers compete on flat terrain, but actually most trails incorporate sizable hills.
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In this work, for the sake of simplification, the perception experiments are performed on flat terrains, with a rugged one and a smooth one.
The uncertainties vary from 1.3 m on flat terrains up to 9 m on slope gradients of 80° (Fig. 2).
The mean errors are found to vary from 0 m on flat terrains to −0.9 m on slopes of 80° (Fig. 2).
Helbing et al. have recently examined the emergence of human trail systems on flat terrains while Minetti and Margaria established the effect of gradients on human metabolic efficiency.
This shows a DSM uncertainty approximatively equal to 1 pixel size on flat terrains, which is also consistent with previous estimations using the Pléiades satellites (Berthier et al. 2014; Lacroix et al. 2015), the ASTER GDEM (Toutin 2002) and the SPOT5 satellite (Toutin 2002; Berthier et al. 2014; Tsutsui et al. 2007).
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