com.graphhopper.reader.dem

Class ElevationInterpolator

java.lang.Object

com.graphhopper.reader.dem.ElevationInterpolator

public class ElevationInterpolator
extends Object

Elevation interpolator calculates elevation for the given lat/lon coordinates based on lat/lon/ele coordinates of the given points.

In case of two points, elevation is calculated using linear interpolation (see calculateElevationBasedOnTwoPoints(double, double, double, double, double, double, double, double)).

In case of three points, elevation is calculated using planar interpolation (see calculateElevationBasedOnThreePoints(double, double, double, double, double, double, double, double, double, double, double)).

In case of more than three points, elevation is calculated using the interpolation method described in the following post (see calculateElevationBasedOnPointList(double, double, PointList).

Author:

Alexey Valikov

Field Summary

Fields

Modifier and Type	Field and Description
static double	EPSILON
static double	EPSILON2

Constructor Summary

Constructors

Constructor and Description
ElevationInterpolator()

Method Summary

Modifier and Type	Method and Description
double	calculateElevationBasedOnPointList(double lat, double lon, PointList pointList)
double	calculateElevationBasedOnThreePoints(double lat, double lon, double lat0, double lon0, double ele0, double lat1, double lon1, double ele1, double lat2, double lon2, double ele2)
double	calculateElevationBasedOnTwoPoints(double lat, double lon, double lat0, double lon0, double ele0, double lat1, double lon1, double ele1)

Methods inherited from class java.lang.Object

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

Field Detail

EPSILON

public static final double EPSILON

See Also:

Constant Field Values

EPSILON2

public static final double EPSILON2

See Also:

Constant Field Values

Constructor Detail

ElevationInterpolator

public ElevationInterpolator()

Method Detail

calculateElevationBasedOnTwoPoints

public double calculateElevationBasedOnTwoPoints(double lat,
                                                 double lon,
                                                 double lat0,
                                                 double lon0,
                                                 double ele0,
                                                 double lat1,
                                                 double lon1,
                                                 double ele1)

calculateElevationBasedOnThreePoints

public double calculateElevationBasedOnThreePoints(double lat,
                                                   double lon,
                                                   double lat0,
                                                   double lon0,
                                                   double ele0,
                                                   double lat1,
                                                   double lon1,
                                                   double ele1,
                                                   double lat2,
                                                   double lon2,
                                                   double ele2)

calculateElevationBasedOnPointList

public double calculateElevationBasedOnPointList(double lat,
                                                 double lon,
                                                 PointList pointList)