gov.nasa.worldwind.terrain

Class AbstractElevationModel

java.lang.Object

gov.nasa.worldwind.avlist.AVListImpl

gov.nasa.worldwind.WWObjectImpl

gov.nasa.worldwind.terrain.AbstractElevationModel

All Implemented Interfaces:

AVList, Disposable, MessageListener, ElevationModel, Restorable, WWObject, PropertyChangeListener, EventListener

Direct Known Subclasses:

BasicElevationModel, BathymetryFilterElevationModel, CompoundElevationModel, LocalElevationModel, ZeroElevationModel

public abstract class AbstractElevationModel
extends WWObjectImpl
implements ElevationModel

Field Summary

Fields

Modifier and Type	Field and Description
protected FileStore	dataFileStore
protected boolean	enabled
protected long	expiryTime
protected double	missingDataFlag
protected double	missingDataValue
protected boolean	networkRetrievalEnabled

Constructor Summary

Constructors

Constructor and Description
AbstractElevationModel()

Method Summary

Modifier and Type	Method and Description
void	composeElevations(Sector sector, List<? extends LatLon> latlons, int tileWidth, double[] buffer) Determines the elevations at specified locations within a specified Sector.
static Element	createElevationModelConfigElements(AVList params, Element context) Appends elevation model configuration parameters as elements to the specified context.
void	dispose() Disposes of any internal resources allocated by the object.
double[]	getBestResolutions(Sector sector)
FileStore	getDataFileStore()
double	getDetailHint(Sector sector) Returns the detail hint associated with the specified sector.
double	getElevation(Angle latitude, Angle longitude) Returns the elevation at a specified location.
static AVList	getElevationModelConfigParams(Element domElement, AVList params) Parses elevation model configuration parameters from the specified DOM document.
double[]	getElevations(Sector sector, List<? extends LatLon> latLons, double[] targetResolutions, double[] elevations) Returns the elevations of a collection of locations.
long	getExpiryTime() Returns the current expiry time.
double	getLocalDataAvailability(Sector sector, Double targetResolution) Returns the proportion of this elevation model's data that is local -- in the computer's data cache or installed data filestore -- for a specified sector and target resolution.
double	getMissingDataReplacement() Returns the elevation used for missing values in the elevation model.
double	getMissingDataSignal() Returns the current missing-data signal.
String	getName() Returns the elevation model's name.
String	getRestorableState() Returns an XML document string describing the object's state.
double[]	getUnmappedElevations(Sector sector, List<? extends LatLon> latLons, double[] targetResolutions, double[] elevations) Returns the elevations of a collection of locations.
double	getUnmappedLocalSourceElevation(Angle latitude, Angle longitude) Returns the elevation for this elevation model's highest level of detail if the source file for that level and the specified location exists in the local elevation cache on disk.
static boolean	isElevationModelConfigDocument(Element domElement) Returns true if a specified DOM document is an ElevationModel configuration document, and false otherwise.
boolean	isEnabled() Indicates whether this elevation model is used or ignored.
boolean	isNetworkRetrievalEnabled() Indicates whether the elevation model is allowed to retrieve data from the network.
protected boolean	isTransparentValue(Double value)
void	restoreState(String stateInXml) Restores the object's state to what is described in the specified XML document string.
void	setDataFileStore(FileStore dataFileStore)
void	setEnabled(boolean enabled) Indicates whether this elevation model is used or ignored.
void	setExpiryTime(long expiryTime) Specifies the time of the elevation model's most recent dataset update.
void	setMissingDataReplacement(double missingDataValue) Specifies the elevation used for missing values in the elevation model.
void	setMissingDataSignal(double missingDataFlag) Specifies the value used to identify missing data in an elevation model.
void	setName(String name) Set the elevation model's name.
void	setNetworkRetrievalEnabled(boolean enabled) Controls whether the elevation model is allowed to retrieve data from the network.
String	toString()

Methods inherited from class gov.nasa.worldwind.WWObjectImpl

onMessage, propertyChange

Methods inherited from class gov.nasa.worldwind.avlist.AVListImpl

addPropertyChangeListener, addPropertyChangeListener, clearList, copy, firePropertyChange, firePropertyChange, getBooleanValue, getBooleanValue, getChangeSupport, getDoubleValue, getDoubleValue, getEntries, getIntegerValue, getIntegerValue, getLongValue, getLongValue, getRestorableStateForAVPair, getStringValue, getStringValue, getStringValue, getValue, getValues, hasKey, removeKey, removePropertyChangeListener, removePropertyChangeListener, setValue, setValues

Methods inherited from class java.lang.Object

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

Methods inherited from interface gov.nasa.worldwind.globes.ElevationModel

contains, getBestResolution, getElevations, getExtremeElevations, getExtremeElevations, getMaxElevation, getMinElevation, getUnmappedElevation, getUnmappedElevations, intersects, isExtremesCachingEnabled, setExtremesCachingEnabled

Methods inherited from interface gov.nasa.worldwind.avlist.AVList

addPropertyChangeListener, addPropertyChangeListener, clearList, copy, firePropertyChange, firePropertyChange, getEntries, getStringValue, getValue, getValues, hasKey, removeKey, removePropertyChangeListener, removePropertyChangeListener, setValue, setValues

Methods inherited from interface java.beans.PropertyChangeListener

propertyChange

Methods inherited from interface gov.nasa.worldwind.event.MessageListener

onMessage

Field Detail

dataFileStore

protected FileStore dataFileStore

enabled

protected boolean enabled

expiryTime

protected long expiryTime

missingDataFlag

protected double missingDataFlag

missingDataValue

protected double missingDataValue

networkRetrievalEnabled

protected boolean networkRetrievalEnabled

Constructor Detail

AbstractElevationModel

public AbstractElevationModel()

Method Detail

composeElevations

public void composeElevations(Sector sector,
                              List<? extends LatLon> latlons,
                              int tileWidth,
                              double[] buffer)
                       throws Exception

Description copied from interface: ElevationModel

Determines the elevations at specified locations within a specified Sector.

Specified by:

composeElevations in interface ElevationModel

Parameters:

sector - the sector containing the locations.

latlons - the locations for which to return elevations.

tileWidth - the number of locations that comprise one row in the latlons argument.

buffer - a buffer in which to put the elevations. The buffer must have at least as many elements as the number of specified locations.

Throws:

Exception - if the method fails. Different elevation models may fail for different reasons.

IllegalArgumentException - if either the sector, list of locations or buffer is null, if the buffer size is not at least as large as the location list, or the tile width is greater than the locations list length or less than 1.

createElevationModelConfigElements

public static Element createElevationModelConfigElements(AVList params,
                                                         Element context)

Appends elevation model configuration parameters as elements to the specified context. This appends elements for the following parameters:

	Parameter	Element Path	Type
AVKey.DISPLAY_NAME	DisplayName	String
AVKey.NETWORK_RETRIEVAL_ENABLED	NetworkRetrievalEnabled	Boolean
AVKey.MISSING_DATA_SIGNAL	MissingData/@signal	Double
AVKey.MISSING_DATA_REPLACEMENT	MissingData/@replacement	Double
AVKey.DETAIL_HINT	DataDetailHint	Double

Parameters:

params - the key-value pairs which define the elevation model configuration parameters.

context - the XML document root on which to append elevation model configuration elements.

Returns:

a reference to context.

Throws:

IllegalArgumentException - if either the parameters or the context are null.

dispose

public void dispose()

Description copied from interface: Disposable

Disposes of any internal resources allocated by the object.

Specified by:

dispose in interface Disposable

getBestResolutions

public double[] getBestResolutions(Sector sector)

Specified by:

getBestResolutions in interface ElevationModel

getDataFileStore

public FileStore getDataFileStore()

getDetailHint

public double getDetailHint(Sector sector)

Description copied from interface: ElevationModel

Returns the detail hint associated with the specified sector. If the elevation model does not have any detail hint for the sector, this method returns zero.

Specified by:

getDetailHint in interface ElevationModel

Parameters:

sector - the sector in question.

Returns:

The detail hint corresponding to the specified sector.

getElevation

public double getElevation(Angle latitude,
                           Angle longitude)

Description copied from interface: ElevationModel

Returns the elevation at a specified location. If the elevation at the specified location is the elevation model's missing data signal, or if the location specified is outside the elevation model's coverage area, the elevation model's missing data replacement value is returned.

The elevation returned from this method is the best available in memory. If no elevation is in memory, the elevation model's minimum extreme elevation at the location is returned. Local disk caches are not consulted.

Specified by:

getElevation in interface ElevationModel

Parameters:

latitude - the latitude of the location in question.

longitude - the longitude of the location in question.

Returns:

The elevation corresponding to the specified location, or the elevation model's missing-data replacement value if there is no elevation for the given location.

See Also:

ElevationModel.setMissingDataSignal(double), ElevationModel.getUnmappedElevation(gov.nasa.worldwind.geom.Angle, gov.nasa.worldwind.geom.Angle)

getElevationModelConfigParams

public static AVList getElevationModelConfigParams(Element domElement,
                                                   AVList params)

Parses elevation model configuration parameters from the specified DOM document. This writes output as key-value pairs to params. If a parameter from the XML document already exists in params, that parameter is ignored. Supported parameters are:

	Parameter	Element Path	Type
AVKey.DISPLAY_NAME	DisplayName	String
AVKey.NETWORK_RETRIEVAL_ENABLED	NetworkRetrievalEnabled	Boolean
AVKey.MISSING_DATA_SIGNAL	MissingData/@signal	Double
AVKey.MISSING_DATA_REPLACEMENT	MissingData/@replacement	Double
AVKey.DETAIL_HINT	DataDetailHint	Double

Parameters:

domElement - the XML document root to parse for elevation model configuration elements.

params - the output key-value pairs which recieve the elevation model configuration parameters. A null reference is permitted.

Returns:

a reference to params, or a new AVList if params is null.

Throws:

IllegalArgumentException - if the document is null.

getElevations

public double[] getElevations(Sector sector,
                              List<? extends LatLon> latLons,
                              double[] targetResolutions,
                              double[] elevations)

Description copied from interface: ElevationModel

Returns the elevations of a collection of locations. Replaces any elevation values corresponding to the missing data signal with the elevation model's missing data replacement value. If a location within the elevation model's coverage area cannot currently be determined, the elevation model's minimum extreme elevation for that location is returned in the output buffer. If a location is outside the elevation model's coverage area, the output buffer for that location is not modified; it retains the buffer's original value.

Specified by:

getElevations in interface ElevationModel

Parameters:

sector - the sector in question.

latLons - the locations to return elevations for. If a location is null, the output buffer for that location is not modified.

targetResolutions - the desired horizontal resolution, in radians, of the raster or other elevation sample from which elevations are drawn. (To compute radians from a distance, divide the distance by the radius of the globe, ensuring that both the distance and the radius are in the same units.) This is an array to enable specification of a target resolution per elevation model for CompoundElevationModel. The entries must be in the same order as the elevations in CompoundElevationModel.

elevations - an array in which to place the returned elevations. The array must be pre-allocated and contain at least as many elements as the list of locations.

Returns:

the resolutions achieved, in radians, which will be Double.MAX_VALUE if individual elevations cannot be determined for all of the locations. The entries are in the same order as the elevations in CompoundElevationModel.

See Also:

ElevationModel.setMissingDataSignal(double)

getExpiryTime

public long getExpiryTime()

Description copied from interface: ElevationModel

Returns the current expiry time.

Specified by:

getExpiryTime in interface ElevationModel

Returns:

the current expiry time.

See Also:

ElevationModel.setExpiryTime(long)

getLocalDataAvailability

public double getLocalDataAvailability(Sector sector,
                                       Double targetResolution)

Description copied from interface: ElevationModel

Returns the proportion of this elevation model's data that is local -- in the computer's data cache or installed data filestore -- for a specified sector and target resolution.

Specified by:

getLocalDataAvailability in interface ElevationModel

Parameters:

sector - the sector of interest.

targetResolution - the desired horizontal resolution, in radians, of the raster or other elevation sample from which elevations are drawn. (To compute radians from a distance, divide the distance by the radius of the globe, ensuring that both the distance and the radius are in the same units.) Specify null to use this elevation model's best resolution.

Returns:

the fraction of the data that is local. A value of 1.0 indicates that all the data is available.

getMissingDataReplacement

public double getMissingDataReplacement()

Description copied from interface: ElevationModel

Returns the elevation used for missing values in the elevation model.

Specified by:

getMissingDataReplacement in interface ElevationModel

Returns:

the value that indicates that no data is available at a location.

See Also:

ElevationModel.setMissingDataSignal(double), ElevationModel.getMissingDataSignal()

getMissingDataSignal

public double getMissingDataSignal()

Description copied from interface: ElevationModel

Returns the current missing-data signal.

Specified by:

getMissingDataSignal in interface ElevationModel

Returns:

the missing-data signal.

See Also:

ElevationModel.getMissingDataReplacement()

getName

public String getName()

Description copied from interface: ElevationModel

Returns the elevation model's name.

Specified by:

getName in interface ElevationModel

Returns:

the elevation model's name.

See Also:

ElevationModel.setName(String)

getRestorableState

public String getRestorableState()

Description copied from interface: Restorable

Returns an XML document string describing the object's state. This state can be restored later by calling restoreState and passing the XML document.

Specified by:

getRestorableState in interface Restorable

Returns:

an XML document string describing the object's state.

getUnmappedElevations

public double[] getUnmappedElevations(Sector sector,
                                      List<? extends LatLon> latLons,
                                      double[] targetResolutions,
                                      double[] elevations)

Description copied from interface: ElevationModel

Returns the elevations of a collection of locations. Does not replace any elevation values corresponding to the missing data signal with the elevation model's missing data replacement value. If a location within the elevation model's coverage area cannot currently be determined, the elevation model's minimum extreme elevation for that location is returned in the output buffer. If a location is outside the elevation model's coverage area, the output buffer for that location is not modified; it retains the buffer's original value.

Specified by:

getUnmappedElevations in interface ElevationModel

Parameters:

sector - the sector in question.

latLons - the locations to return elevations for. If a location is null, the output buffer for that location is not modified.

targetResolutions - the desired horizontal resolution, in radians, of the raster or other elevation sample from which elevations are drawn. (To compute radians from a distance, divide the distance by the radius of the globe, ensuring that both the distance and the radius are in the same units.) This is an array to enable specification of a target resolution per elevation model for CompoundElevationModel. The entries must be in the same order as the elevations in CompoundElevationModel.

elevations - an array in which to place the returned elevations. The array must be pre-allocated and contain at least as many elements as the list of locations.

Returns:

the resolutions achieved, in radians, which will be Double.MAX_VALUE if individual elevations cannot be determined for all of the locations. The entries are in the same order as the elevations in CompoundElevationModel.

See Also:

ElevationModel.setMissingDataSignal(double)

getUnmappedLocalSourceElevation

public double getUnmappedLocalSourceElevation(Angle latitude,
                                              Angle longitude)

Description copied from interface: ElevationModel

Returns the elevation for this elevation model's highest level of detail if the source file for that level and the specified location exists in the local elevation cache on disk. This method is useful only when an elevation dataset has been pre-cached.

Specified by:

getUnmappedLocalSourceElevation in interface ElevationModel

Parameters:

latitude - The latitude of the location whose elevation is desired.

longitude - The longitude of the location whose elevation is desired.

Returns:

The elevation at the specified location, if that location is contained in this elevation model and the source file for the highest-resolution elevation at that location exists in the current disk cache. Otherwise this elevation model's missing data signal is returned (see ElevationModel.getMissingDataSignal()).

isElevationModelConfigDocument

public static boolean isElevationModelConfigDocument(Element domElement)

Returns true if a specified DOM document is an ElevationModel configuration document, and false otherwise.

Parameters:

domElement - the DOM document in question.

Returns:

true if the document is an ElevationModel configuration document; false otherwise.

Throws:

IllegalArgumentException - if document is null.

isEnabled

public boolean isEnabled()

Description copied from interface: ElevationModel

Indicates whether this elevation model is used or ignored.

Specified by:

isEnabled in interface ElevationModel

Returns:

true if this elevation model is used, otherwise false.

isNetworkRetrievalEnabled

public boolean isNetworkRetrievalEnabled()

Description copied from interface: ElevationModel

Indicates whether the elevation model is allowed to retrieve data from the network. Some elevation models have no need to retrieve data from the network. This flag is meaningless for such elevation models.

Specified by:

isNetworkRetrievalEnabled in interface ElevationModel

Returns:

true if the elevation model is enabled to retrieve network data, else false.

isTransparentValue

protected boolean isTransparentValue(Double value)

restoreState

public void restoreState(String stateInXml)

Description copied from interface: Restorable

Restores the object's state to what is described in the specified XML document string.

Specified by:

restoreState in interface Restorable

Parameters:

stateInXml - an XML document string describing an object's state.

setDataFileStore

public void setDataFileStore(FileStore dataFileStore)

setEnabled

public void setEnabled(boolean enabled)

Description copied from interface: ElevationModel

Indicates whether this elevation model is used or ignored.

Specified by:

setEnabled in interface ElevationModel

Parameters:

enabled - true if this elevation model is used, otherwise false.

setExpiryTime

public void setExpiryTime(long expiryTime)

Description copied from interface: ElevationModel

Specifies the time of the elevation model's most recent dataset update. If greater than zero, the model ignores and eliminates any previously cached data older than the time specified, and requests new information from the data source. If zero, the model uses any expiry times intrinsic to the model, typically initialized at model construction. The default expiry time is 0, thereby enabling a model's intrinsic expiration criteria.

Specified by:

setExpiryTime in interface ElevationModel

Parameters:

expiryTime - the expiry time of any cached data, expressed as a number of milliseconds beyond the epoch.

See Also:

for a description of milliseconds beyond the epoch.

setMissingDataReplacement

public void setMissingDataReplacement(double missingDataValue)

Description copied from interface: ElevationModel

Specifies the elevation used for missing values in the elevation model.

Specified by:

setMissingDataReplacement in interface ElevationModel

Parameters:

missingDataValue - the value that indicates that no data is available at a location.

See Also:

ElevationModel.setMissingDataSignal(double)

setMissingDataSignal

public void setMissingDataSignal(double missingDataFlag)

Description copied from interface: ElevationModel

Specifies the value used to identify missing data in an elevation model. Locations with this elevation value are assigned the missing-data replacement value, specified by ElevationModel.setMissingDataReplacement(double).

The missing-data value is often specified by the metadata of the data set, in which case the elevation model automatically defines that value to be the missing-data signal. When the missing-data signal is not specified in the metadata, the application may specify it via this method.

Specified by:

setMissingDataSignal in interface ElevationModel

Parameters:

missingDataFlag - the missing-data signal value. The default is -Double.MAX_VALUE.

See Also:

ElevationModel.setMissingDataReplacement(double), ElevationModel.getMissingDataSignal()

setName

public void setName(String name)

Description copied from interface: ElevationModel

Set the elevation model's name. The name is a convenience attribute typically used to identify the elevation model in user interfaces. By default, an elevation model has no name.

Specified by:

setName in interface ElevationModel

Parameters:

name - the name to give the elevation model.

setNetworkRetrievalEnabled

public void setNetworkRetrievalEnabled(boolean enabled)

Description copied from interface: ElevationModel

Controls whether the elevation model is allowed to retrieve data from the network. Some elevation models have no need for data from the network. This flag may be set but is meaningless for such elevation models.

Specified by:

setNetworkRetrievalEnabled in interface ElevationModel

Parameters:

enabled - true if network retrieval is allowed, else false.

toString

public String toString()

Overrides:

toString in class Object