Package com.graphhopper.reader.dem

Class MultiSourceElevationProvider

java.lang.Object

com.graphhopper.reader.dem.TileBasedElevationProvider

com.graphhopper.reader.dem.MultiSourceElevationProvider

All Implemented Interfaces:

ElevationProvider

public class MultiSourceElevationProvider
extends TileBasedElevationProvider

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	Description
MultiSourceElevationProvider()
MultiSourceElevationProvider(TileBasedElevationProvider srtmProvider, TileBasedElevationProvider globalProvider)
MultiSourceElevationProvider(String cacheDir)

Method Summary

Modifier and Type	Method	Description
boolean	canInterpolate()	Returns true if bilinear interpolation is enabled.
double	getEle(double lat, double lon)
void	release()	Release resources.
MultiSourceElevationProvider	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'.
MultiSourceElevationProvider	setBaseURL(String baseURL)	For the MultiSourceElevationProvider you have to specify the base URL separated by a ';'.
MultiSourceElevationProvider	setDAType(DAType daType)	Set to true if you have a small area and need high speed access.
MultiSourceElevationProvider	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 com.graphhopper.reader.dem.TileBasedElevationProvider

getCacheDir, getDirectory, setDownloader

Methods inherited from class java.lang.Object

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

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

getEle

Constructor Details

MultiSourceElevationProvider

public MultiSourceElevationProvider(TileBasedElevationProvider srtmProvider,
 TileBasedElevationProvider globalProvider)

MultiSourceElevationProvider

public MultiSourceElevationProvider()

MultiSourceElevationProvider

public MultiSourceElevationProvider(String cacheDir)

Method Details

getEle

public double getEle(double lat,
 double lon)

Returns:

returns the height in meters or Double.NaN if invalid

setBaseURL

public MultiSourceElevationProvider setBaseURL(String baseURL)

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

Overrides:

setBaseURL in class TileBasedElevationProvider

setDAType

public MultiSourceElevationProvider setDAType(DAType daType)

Description copied from class: TileBasedElevationProvider

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

Overrides:

setDAType in class TileBasedElevationProvider

setInterpolate

public MultiSourceElevationProvider setInterpolate(boolean interpolate)

Description copied from class: TileBasedElevationProvider

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.

Overrides:

setInterpolate in class TileBasedElevationProvider

canInterpolate

public boolean canInterpolate()

Description copied from interface: ElevationProvider

Returns true if bilinear interpolation is enabled.

Specified by:

canInterpolate in interface ElevationProvider

Overrides:

canInterpolate in class TileBasedElevationProvider

release

public void release()

Description copied from interface: ElevationProvider

Release resources.

setAutoRemoveTemporaryFiles

public MultiSourceElevationProvider setAutoRemoveTemporaryFiles(boolean autoRemoveTemporary)

Description copied from class: TileBasedElevationProvider

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'.

Overrides:

setAutoRemoveTemporaryFiles in class TileBasedElevationProvider

toString

public String toString()

Overrides:

toString in class Object