com.graphhopper.reader.dem

Class MultiSourceElevationProvider

java.lang.Object

com.graphhopper.reader.dem.MultiSourceElevationProvider

All Implemented Interfaces:

ElevationProvider

public class MultiSourceElevationProvider
extends Object
implements ElevationProvider

The MultiSourceElevationProvider mixes different elevation providers to provide the best available elevation data for a certain area.

Author:

Robin Boldt

Field Summary

Fields inherited from interface com.graphhopper.reader.dem.ElevationProvider

NOOP

Constructor Summary

Constructors

Constructor and Description
MultiSourceElevationProvider()
MultiSourceElevationProvider(ElevationProvider srtmProvider, ElevationProvider globalProvider)
MultiSourceElevationProvider(String cacheDir)

Method Summary

Modifier and Type	Method and Description
double	getEle(double lat, double lon)
void	release() Release resources.
void	setAutoRemoveTemporaryFiles(boolean autoRemoveTemporary) Creating temporary files can take a long time as we need to unpack them as well as to fill our DataAccess object, so this option can be used to disable the default clear mechanism via specifying 'false'.
ElevationProvider	setBaseURL(String baseURL) For the MultiSourceElevationProvider you have to specify the base URL separated by a ';'.
ElevationProvider	setDAType(DAType daType) Set to true if you have a small area and need high speed access.
void	setInterpolate(boolean interpolate) Configuration option to use bilinear interpolation to find the elevation at a point from the surrounding elevation points.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiSourceElevationProvider

public MultiSourceElevationProvider(ElevationProvider srtmProvider,
                                    ElevationProvider globalProvider)

MultiSourceElevationProvider

public MultiSourceElevationProvider()

MultiSourceElevationProvider

public MultiSourceElevationProvider(String cacheDir)

Method Detail

getEle

public double getEle(double lat,
                     double lon)

Specified by:

getEle in interface ElevationProvider

Returns:

returns the height in meters or Double.NaN if invalid

setBaseURL

public ElevationProvider setBaseURL(String baseURL)

For the MultiSourceElevationProvider you have to specify the base URL separated by a ';'. The first for cgiar, the second for gmted.

Specified by:

setBaseURL in interface ElevationProvider

setDAType

public ElevationProvider setDAType(DAType daType)

Description copied from interface: ElevationProvider

Set to true if you have a small area and need high speed access. Default is DAType.MMAP

Specified by:

setDAType in interface ElevationProvider

setInterpolate

public void setInterpolate(boolean interpolate)

Description copied from interface: ElevationProvider

Configuration option to use bilinear interpolation to find the elevation at a point from the surrounding elevation points. Has only an effect if called before the first getEle call. Turned off by default.

Specified by:

setInterpolate in interface ElevationProvider

release

public void release()

Description copied from interface: ElevationProvider

Release resources.

Specified by:

release in interface ElevationProvider

setAutoRemoveTemporaryFiles

public void setAutoRemoveTemporaryFiles(boolean autoRemoveTemporary)

Description copied from interface: ElevationProvider

Creating temporary files can take a long time as we need to unpack them as well as to fill our DataAccess object, so this option can be used to disable the default clear mechanism via specifying 'false'.

Specified by:

setAutoRemoveTemporaryFiles in interface ElevationProvider

toString

public String toString()

Overrides:

toString in class Object