org.opentripplanner.routing.util

Class ElevationUtils

java.lang.Object

org.opentripplanner.routing.util.ElevationUtils

public class ElevationUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
ElevationUtils()

Method Summary

Modifier and Type	Method and Description
static PackedCoordinateSequence	getPartialElevationProfile(PackedCoordinateSequence elevationProfile, double start, double end)
static SlopeCosts	getSlopeCosts(com.vividsolutions.jts.geom.CoordinateSequence elev, boolean slopeLimit)
static double	getWalkCostsForSlope(double verticalDistance, double maxSlope) The cost for walking in hilly/mountain terrain dependent on slope using an empirical function by WG Rees (Comp & Geosc, 2004), that overhauls the Naismith rule for mountaineering. For a slope of 0 = 0 degree a cost is returned that approximates a speed of 1.333 m/sec = 4.8km/h TODO: Not sure if it makes sense to use maxSlope as input and instead better use a lower estimate / average value.
static Double	parseEleTag(String ele) checks for units (m/ft) in an OSM ele tag value, and returns the value in meters
static double	slopeSpeedCoefficient(double slope, double altitude)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ElevationUtils

public ElevationUtils()

Method Detail

getSlopeCosts

public static SlopeCosts getSlopeCosts(com.vividsolutions.jts.geom.CoordinateSequence elev,
                                       boolean slopeLimit)

Parameters:

elev - The elevation profile, where each (x, y) is (distance along edge, elevation)

slopeLimit - Whether the slope should be limited to 0.35, which is the max slope for streets that take cars.

Returns:

slopeSpeedCoefficient

public static double slopeSpeedCoefficient(double slope,
                                           double altitude)

getWalkCostsForSlope

public static double getWalkCostsForSlope(double verticalDistance,
                                          double maxSlope)

The cost for walking in hilly/mountain terrain dependent on slope using an empirical function by WG Rees (Comp & Geosc, 2004), that overhauls the Naismith rule for mountaineering.
For a slope of 0 = 0 degree a cost is returned that approximates a speed of 1.333 m/sec = 4.8km/h
TODO: Not sure if it makes sense to use maxSlope as input and instead better use a lower estimate / average value. However, the DEM is most likely generalized/smoothed and hence maxSlope may be smaller than in the real world.

Parameters:

verticalDistance - the vertical distance of the line segment

maxSlope - the slope of the segment

Returns:

walk costs dependent on slope (in seconds)

getPartialElevationProfile

public static PackedCoordinateSequence getPartialElevationProfile(PackedCoordinateSequence elevationProfile,
                                                                  double start,
                                                                  double end)

parseEleTag

public static Double parseEleTag(String ele)

checks for units (m/ft) in an OSM ele tag value, and returns the value in meters