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More conservative estimates for walking slopes #3982

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Spell out MTNT formula
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hungerburg authored Feb 20, 2023
commit b27eedeb860af59e9d90a91070c35a1150d03ecc
3 changes: 3 additions & 0 deletions src/sif/pedestriancost.cc
Original file line number Diff line number Diff line change
@@ -178,6 +178,9 @@ const BaseCostingOptionsConfig kBaseCostOptsConfig = GetBaseCostOptsConfig();
// For comparison, value researched by the Mountain Tactical Institute
// https://mtntactical.com/research/yet-calculating-movement-uneven-terrain/
// https://mtntactical.com/research/walking-uphill-10-grade-cuts-speed-13not-12/
// The MTNT finding goes: Contrary to some conventional wisdom, instead of
// halving speed, 10% increase in incline only bring down speed one third.
// Their approximation "math.exp(-0.04*slope)" below shown as last value per row.
//
// When tweaking for users with better performance, do not change flat-speed,
// instead up the values of ascent/descent, e.g. 400/800 better matches