com.graphhopper.reader.dem

Class TileBasedElevationProvider

java.lang.Object

com.graphhopper.reader.dem.TileBasedElevationProvider

All Implemented Interfaces:

ElevationProvider

Direct Known Subclasses:

AbstractSRTMElevationProvider, AbstractTiffElevationProvider, MultiSourceElevationProvider

public abstract class TileBasedElevationProvider
extends Object
implements ElevationProvider

Provides basic methods that are usually used in an ElevationProvider using tiles from files.

Author:

Robin Boldt

Field Summary

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

NOOP

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TileBasedElevationProvider(String cacheDirString)

Method Summary

Modifier and Type	Method and Description
boolean	canInterpolate() Returns true if bilinear interpolation is enabled.
protected File	getCacheDir()
protected Directory	getDirectory()
TileBasedElevationProvider	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'.
TileBasedElevationProvider	setBaseURL(String baseUrl) Specifies the service URL where to download the elevation data.
TileBasedElevationProvider	setDAType(DAType daType) Set to true if you have a small area and need high speed access.
TileBasedElevationProvider	setDownloader(Downloader downloader)
TileBasedElevationProvider	setInterpolate(boolean interpolate) Configuration option to use bilinear interpolation to find the elevation at a point from the surrounding elevation points.

Methods inherited from class java.lang.Object

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

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

getEle, getEle, release

Constructor Detail

TileBasedElevationProvider

protected TileBasedElevationProvider(String cacheDirString)

Method Detail

setInterpolate

public TileBasedElevationProvider setInterpolate(boolean interpolate)

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.

canInterpolate

public boolean canInterpolate()

Description copied from interface: ElevationProvider

Returns true if bilinear interpolation is enabled.

Specified by:

canInterpolate in interface ElevationProvider

setBaseURL

public TileBasedElevationProvider setBaseURL(String baseUrl)

Specifies the service URL where to download the elevation data. An empty string should set it to the default URL. Default is a provider-dependent URL which should work out of the box.

setDAType

public TileBasedElevationProvider setDAType(DAType daType)

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

setAutoRemoveTemporaryFiles

public TileBasedElevationProvider 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'.

setDownloader

public TileBasedElevationProvider setDownloader(Downloader downloader)

getCacheDir

protected File getCacheDir()

getDirectory

protected Directory getDirectory()