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MTB_factor and smallpaved_factor
- Parameters MTB_factor and smallpaved_factor modifies the behavior of profiles based on the Trekking-Poutnik template. The effect is created by the parameter of positive value (+), negative value (-) or parameter has no effect (0). The opposite parameter value sign has the opposite effect.
Effect | MTB_factor | Smallpaved_factor |
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Supress unpaved ways* | - | + |
Supress mainroad network | + | + |
Prefer unpaved ways | + | - |
Prefer mainroad network | - | - |
Prefers small paved roads | 0 | + |
Prefers less hilly roads | - | + |
Decreases turncost | + | - |
Decreases roughness penalty | + | - |
* way means any OSM way highway=*, physically a general way from motorway to path
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The Positive values of MTB_factor progressively increases costfactor of mainroads, while decreases costfactor of of unpaved tracks/paths. It additionally decreases elevationcost and roughness cost ( combined evaluation of tags smoothness and MTB_scale ), so bikers are more stimulated to take up/down tracks.
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The Negative values of MTB_factor have the opposite effect: They progressively prefer the mainroads and supress unpaved ways, increase elevationcosts(preferring flatter roads) and additionally suppress rough surfaces.
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Positive values of smallpaved_factor progressively suppress mainroads and unpaved ways, promoting small paved roads. Negative values suppresses small paved roads - this makes sense together with big MTB_factor.
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The road suppressing/boosting scale is unified for the both factors, using the common scaling factor
univ_factor_coef
. Similarly is unified the approach to elevation and roughtness penalties. -
MTB_factor 1.0 adds 1.0 to the highway=trunk costfactor, making 1 km of such road effectively 1 km longs. As the opposite, it adds -1.0 to the costfactor of highways=track|path, trackgrade=grade5, surface=ground, making 1 km effectively 1 km shorter.( Notes that the base effective length of such 1 km track is significantly bigger than 1 km.)
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Smallpaved_factor 1.0 adds 1.0 to costfactor of both trunk and unpaved ground tracks.
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Effect of both factors on intermediate road classes a/o surfaces is somewhere between both extremes.
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The OSM ways classes are figurally spreaded along the horizontal scale with big roads like trunks on the very left, small paved roads/tracks in the middle and small gravel/soil paths on the very right.
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Values below are from Trekking-Poutnik template version 2.4.15 ALFA, can be subject of later tuning.
For current values, see Trekking-Poutnik current template
assign univ_factor_coef = (
if ( highway=motorway|motorway_link|trunk|trunk_link ) then 1.0
else if ( highway=primary|primary_link ) then 0.9
else if ( highway=secondary|secondary_link ) then 0.7
else if ( highway=tertiary|tertiary_link ) then 0.4
else if ( highway=unclassified ) then 0.25
else if ( highway=residential|living_street|service|pedestrian|footway )
then switch ispaved 0.25 switch isunpaved -0.4 0.0
else if not highway=track|road|path then switch ispaved 0.25 switch isunpaved -0.4 0.0 #
else if highway=track|road then ( # not path
if surface=concrete then -0.2
else if and tracktype=grade1 ispaved then 0.2
else if or tracktype=grade1 ispaved then 0.1
else multiply ( add 1.0 ( multiply 0.33 roughness_penalty ) )
( if surface=cobblestone then -0.4
else if surface=fine_gravel then -0.4
else if surface= then switch tracktype=grade2|grade3 -0.4 -0.7
else if surface=compacted then -0.5
else if surface=grass then -0.8
else if surface=ground|gravel|pebblestone|mud then -1.0
else -1.0
)
)
# is path
else ( multiply ( add 1.0 ( multiply 0.33 roughness_penalty ) )
( if surface=concrete then -0.3
else if ispaved then 0.1
else if surface=compacted|fine_gravel then -0.4
else -1.0
)
)
)