Package gov.nasa.worldwind.terrain

Class ZeroElevationModel

java.lang.Object

gov.nasa.worldwind.avlist.AVListImpl

gov.nasa.worldwind.WWObjectImpl

gov.nasa.worldwind.terrain.AbstractElevationModel

gov.nasa.worldwind.terrain.ZeroElevationModel

All Implemented Interfaces:

AVList, Disposable, MessageListener, ElevationModel, Restorable, WWObject, java.beans.PropertyChangeListener, java.util.EventListener

public class ZeroElevationModel
extends AbstractElevationModel

An elevation model that always returns zero elevations.

Field Summary

Fields inherited from class gov.nasa.worldwind.terrain.AbstractElevationModel

dataFileStore, enabled, expiryTime, missingDataFlag, missingDataValue, networkRetrievalEnabled

Constructor Summary

Constructors

Constructor	Description
ZeroElevationModel()

Method Summary

Modifier and Type	Method	Description
boolean	contains(Angle latitude, Angle longitude)	Indicates whether a specified location is within the elevation model's domain.
double	getBestResolution(Sector sector)	Indicates the best resolution attainable for a specified sector.
double	getElevations(Sector sector, java.util.List<? extends LatLon> latlons, double targetResolution, double[] buffer)	Returns the elevations of a collection of locations.
double[]	getExtremeElevations(Angle latitude, Angle longitude)	Returns the minimum and maximum elevations at a specified location.
double[]	getExtremeElevations(Sector sector)	Returns the minimum and maximum elevations within a specified sector of the elevation model.
double	getMaxElevation()	Returns the maximum elevation contained in the elevation model.
double	getMinElevation()	Returns the minimum elevation contained in the elevation model.
double	getUnmappedElevation(Angle latitude, Angle longitude)	Returns the elevation at a specified location, but without replacing missing data with the elevation model's missing data replacement value.
double	getUnmappedElevations(Sector sector, java.util.List<? extends LatLon> latlons, double targetResolution, double[] buffer)	Returns the elevations of a collection of locations.
int	intersects(Sector sector)	Indicates whether the elevation model covers a specified sector either partially or fully.
boolean	isExtremesCachingEnabled()	Indicates whether extreme value caching is enabled.
void	setExtremesCachingEnabled(boolean enabled)	Indicates whether extreme values of sectors should be cached as they're computed.

Methods inherited from class gov.nasa.worldwind.terrain.AbstractElevationModel

composeElevations, createElevationModelConfigElements, dispose, getBestResolutions, getDataFileStore, getDetailHint, getElevation, getElevationModelConfigParams, getElevations, getExpiryTime, getLocalDataAvailability, getMissingDataReplacement, getMissingDataSignal, getName, getRestorableState, getUnmappedElevations, getUnmappedLocalSourceElevation, isElevationModelConfigDocument, isEnabled, isNetworkRetrievalEnabled, isTransparentValue, restoreState, setDataFileStore, setEnabled, setExpiryTime, setMissingDataReplacement, setMissingDataSignal, setName, setNetworkRetrievalEnabled, 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, getClass, hashCode, notify, notifyAll, wait, wait, wait

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 gov.nasa.worldwind.event.MessageListener

onMessage

Methods inherited from interface java.beans.PropertyChangeListener

propertyChange

Constructor Detail

ZeroElevationModel

public ZeroElevationModel()

Method Detail

getMaxElevation

public double getMaxElevation()

Description copied from interface: ElevationModel

Returns the maximum elevation contained in the elevation model. When the elevation model is associated with a globe, this value is the elevation of the highest point on the globe.

Returns:

The maximum elevation of the elevation model.

getMinElevation

public double getMinElevation()

Description copied from interface: ElevationModel

Returns the minimum elevation contained in the elevation model. When associated with a globe, this value is the elevation of the lowest point on the globe. It may be negative, indicating a value below mean surface level. (Sea level in the case of Earth.)

Returns:

The minimum elevation of the model.

getExtremeElevations

public double[] getExtremeElevations(Angle latitude,
                                     Angle longitude)

Description copied from interface: ElevationModel

Returns the minimum and maximum elevations at a specified location.

Parameters:

latitude - the latitude of the location in question.

longitude - the longitude of the location in question.

Returns:

A two-element double array indicating, respectively, the minimum and maximum elevations at the specified location. These values are the global minimum and maximum if the local minimum and maximum values are currently unknown.

getExtremeElevations

public double[] getExtremeElevations(Sector sector)

Description copied from interface: ElevationModel

Returns the minimum and maximum elevations within a specified sector of the elevation model.

Parameters:

sector - the sector in question.

Returns:

A two-element double array indicating, respectively, the sector's minimum and maximum elevations. These elements are the global minimum and maximum if the local minimum and maximum values are currently unknown.

getElevations

public double getElevations(Sector sector,
                            java.util.List<? extends LatLon> latlons,
                            double targetResolution,
                            double[] buffer)

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.

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.

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.)

buffer - 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 resolution achieved, in radians, or Double.MAX_VALUE if individual elevations cannot be determined for all of the locations.

See Also:

ElevationModel.setMissingDataSignal(double)

getUnmappedElevations

public double getUnmappedElevations(Sector sector,
                                    java.util.List<? extends LatLon> latlons,
                                    double targetResolution,
                                    double[] buffer)

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.

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.

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.)

buffer - 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 resolution achieved, in radians, or Double.MAX_VALUE if individual elevations cannot be determined for all of the locations.

See Also:

ElevationModel.setMissingDataSignal(double)

intersects

public int intersects(Sector sector)

Description copied from interface: ElevationModel

Indicates whether the elevation model covers a specified sector either partially or fully.

Parameters:

sector - the sector in question.

Returns:

0 if the elevation model fully contains the sector, 1 if the elevation model intersects the sector but does not fully contain it, or -1 if the sector does not intersect the elevation model.

contains

public boolean contains(Angle latitude,
                        Angle longitude)

Description copied from interface: ElevationModel

Indicates whether a specified location is within the elevation model's domain.

Parameters:

latitude - the latitude of the location in question.

longitude - the longitude of the location in question.

Returns:

true if the location is within the elevation model's domain, otherwise false.

getBestResolution

public double getBestResolution(Sector sector)

Description copied from interface: ElevationModel

Indicates the best resolution attainable for a specified sector.

Parameters:

sector - the sector in question. If null, the elevation model's best overall resolution is returned. This is the best attainable at some locations but not necessarily at all locations.

Returns:

the best resolution attainable for the specified sector, in radians, or Double.MAX_VALUE if the sector does not intersect the elevation model.

getUnmappedElevation

public double getUnmappedElevation(Angle latitude,
                                   Angle longitude)

Description copied from interface: ElevationModel

Returns the elevation at a specified location, but without replacing missing data with the elevation model's missing data replacement value. When a missing data signal is found, the signal value is returned, not the replacement value.

Parameters:

latitude - the latitude of the location for which to return the elevation.

longitude - the longitude of the location for which to return the elevation.

Returns:

the elevation at the specified location, or the elevation model's missing data signal. If no data is currently in memory for the location, and the location is within the elevation model's coverage area, the elevation model's minimum elevation at that location is returned.

setExtremesCachingEnabled

public void setExtremesCachingEnabled(boolean enabled)

Description copied from interface: ElevationModel

Indicates whether extreme values of sectors should be cached as they're computed. Caching should be disabled if especially many sectors are to be used when querying extreme elevations of this elevation model, such as during terrain intersection calculations. The default is for caching to be enabled. During normal operation caching enhances performance, but during terrain intersection computation it can hamper performance.

Parameters:

enabled - true if extreme value caching should be performed.

isExtremesCachingEnabled

public boolean isExtremesCachingEnabled()

Description copied from interface: ElevationModel

Indicates whether extreme value caching is enabled.

Returns:

true if extreme values caching is enabled, otherwise false.

See Also:

ElevationModel.setExtremesCachingEnabled(boolean)