Format pseudo tags docs

docs/developers/environmental_considerations_and_pseudo_tags.md

@@ -1,7 +1,9 @@
 Environmental considerations (penalties for traffic, noise, town, no river, no forest) are possible due to the creation of pseudo tags during processing OSM data by spatial SQL queries in https://github.com/abrensch/brouter/blob/master/misc/scripts/mapcreation/brouter.sql. During this processing, roads are extended by a 32 m buffer creating 64 m wide lines. Then it is calculated what percentage of such line is at a specific distance to a noise source or within a forest, for example. The percentage is converted to a factor and the factor is assigned to a class. Ways that pass through different environments and are represented by a single OSM way can be problematic because the class is always based on the average environment along an entire OSM way. For traffic, calculations are on another level of complexity.
 
 ### consider_noise, noise_penalty
+
 For proximity of noisy roads (secondary and higher). The noise factor represents the proportion of a road's buffer area that lies within the 64-meter buffer of noisy roads. This proportion is reduced:
+
 - for motorways and trunk roads with max speed < 105 by 1.5
 - for primary roads 2 times
 - 3 times if maxspeed is 75 - 105 for primary and secondary
@@ -10,6 +12,7 @@ For proximity of noisy roads (secondary and higher). The noise factor represents
 Noise class is roughly proportional to the noise factor:
 
 noise_factor = noise class
+
 - < 0.1 = '1'
 - < 0.25 = '2'
 - < 0.4 = '3'
@@ -17,7 +20,7 @@ noise_factor = noise class
 - < 0.8 = '5'
 - ELSE = '6'
 
-To be classified as noise class 6, a way must be less than 13 m on average from the middle of the carriageway of a motorway with a maximum speed exceeding 105. For a class 5, the distance must be up to 35 meters.  (1 - noise factor) * 64 m for a given class determines the distance
+To be classified as noise class 6, a way must be less than 13 m on average from the middle of the carriageway of a motorway with a maximum speed exceeding 105. For a class 5, the distance must be up to 35 meters. (1 - noise factor) \* 64 m for a given class determines the distance
 
 **Max noise class:**
 | Max speed | Motorway, trunk |Primary|Secondary |
@@ -26,15 +29,17 @@ To be classified as noise class 6, a way must be less than 13 m on average from
 | 105 |5 |4 |3 |
 | 75 |5 |3 |2 |
 
-
 ### consider_river, no_river_penalty
+
 OSM data recognized as river:
+
 - waterway: river, canal
 - natural: water (except wastewater)
 
 Waterways have 32 m wide buffers. Water areas have 77 m wide buffers.
 
 river_see = river class
+
 - < 0.17 = '1'
 - < 0.35 = '2'
 - < 0.57 = '3'
@@ -43,7 +48,9 @@ river_see = river class
 - ELSE = '6'
 
 ### consider_forest, no_forest_penalty
+
 OSM data recognized as forest:
+
 - landuse: forest, allotments, flowerbed, orchard, vineyard, recreation_ground, village_green
 - leisure: garden, park, nature_reserve
 
@@ -52,6 +59,7 @@ No forest buffers are used.
 Imagine you trace the way with a pencil drawing lines 62 meters wide. Then estimated_forest_class=6 corresponds to the case that at least 98% of the line is in the woodland. This number is called a green factor.
 
 green_factor = forest class
+
 - < 0.1 = NULL
 - < 0.2 = '1'
 - < 0.4 = '2'
@@ -60,12 +68,12 @@ green_factor = forest class
 - < 0.98 = '5'
 - ELSE = '6'
 
-
-
 ### consider_town, town_penalty
+
 Town_class is determined by population data from OSM.
 
 Class
+
 - 1 = 50-80 k people
 - 2 = 80-150 k people
 - 3 = 150 - 400 k people
@@ -74,8 +82,10 @@ Class
 - 6 = > 2 million people
 
 ### consider_traffic, traffic_penalty
+
 (modified copy from the sql file).
 OSM data used to estimate the traffic:
+
 - population of towns (+ distance from position to the towns)
 - size of industrial areas (landuse=industrial) and distance to them. Not considered: solar & wind farms.
 - airports international
@@ -83,5 +93,5 @@ OSM data used to estimate the traffic:
 - density of highways (tertiary and higher) calculated on a grid (100 km^2). Traffic decreases when more such roads are available. Exceptions: near junctions between motorways and other roads the traffic increases on these roads.
 - mountain-ranges calculated as density of peaks > 400 m traffic is generally on highways in such regions higher as only generated by the local population or industrial areas
 - calculate traffic from the population (for each segment of type primary secondary tertiary)
-- SUM of (population of each town < 100 km) / ( town-radius + 2500 + dist(segment-position to the town) ** 2 )
+- SUM of (population of each town < 100 km) / ( town-radius + 2500 + dist(segment-position to the town) \*\* 2 )
 - town-radius is calculated as sqrt(population)