com.conveyal.r5.common

Class SphericalDistanceLibrary

java.lang.Object

com.conveyal.r5.common.SphericalDistanceLibrary

public class SphericalDistanceLibrary
extends Object

Created by matthewc on 10/22/15.

Field Summary

Fields

Modifier and Type	Field and Description
static double	EARTH_CIRCUMFERENCE_KM
static double	EARTH_CIRCUMFERENCE_METERS
static double	MAX_ERR_INV
static double	RADIUS_OF_EARTH_IN_KM
static double	RADIUS_OF_EARTH_IN_M

Constructor Summary

Constructors

Constructor and Description
SphericalDistanceLibrary()

Method Summary

Modifier and Type	Method and Description
static double	fastDistance(com.vividsolutions.jts.geom.Coordinate from, com.vividsolutions.jts.geom.Coordinate to) Approximated, fast and under-estimated equirectangular distance between two points.
static double	metersToDegreesLatitude(double meters) Convert meters to degrees of latitude
static double	metersToDegreesLongitude(double meters, double degreesLatitude) Convert meters to degrees of longitude at the specified latitiude

Methods inherited from class java.lang.Object

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

Field Detail

EARTH_CIRCUMFERENCE_KM

public static final double EARTH_CIRCUMFERENCE_KM

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Constant Field Values

EARTH_CIRCUMFERENCE_METERS

public static final double EARTH_CIRCUMFERENCE_METERS

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Constant Field Values

RADIUS_OF_EARTH_IN_KM

public static final double RADIUS_OF_EARTH_IN_KM

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Constant Field Values

RADIUS_OF_EARTH_IN_M

public static final double RADIUS_OF_EARTH_IN_M

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Constant Field Values

MAX_ERR_INV

public static final double MAX_ERR_INV

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Constant Field Values

Constructor Detail

SphericalDistanceLibrary

public SphericalDistanceLibrary()

Method Detail

metersToDegreesLatitude

public static double metersToDegreesLatitude(double meters)

Convert meters to degrees of latitude

metersToDegreesLongitude

public static double metersToDegreesLongitude(double meters,
                                              double degreesLatitude)

Convert meters to degrees of longitude at the specified latitiude

fastDistance

public static double fastDistance(com.vividsolutions.jts.geom.Coordinate from,
                                  com.vividsolutions.jts.geom.Coordinate to)

Approximated, fast and under-estimated equirectangular distance between two points. Correct only for small delta lat/lon See: http://www.movable-type.co.uk/scripts/latlong.html