org.esa.snap.core.dataop.dem

Class BaseElevationModel

java.lang.Object

org.esa.snap.core.dataop.dem.BaseElevationModel

All Implemented Interfaces:

ElevationModel, Resampling.Raster

public abstract class BaseElevationModel
extends Object
implements ElevationModel, Resampling.Raster

Field Summary

Fields

Modifier and Type	Field and Description
protected int	DEGREE_RES
protected double	DEGREE_RES_BY_NUM_PIXELS_PER_TILE
protected double	DEGREE_RES_BY_NUM_PIXELS_PER_TILEinv
protected ElevationModelDescriptor	descriptor
protected double	NO_DATA_VALUE
protected int	NUM_PIXELS_PER_TILE
protected int	NUM_Y_TILES
protected int	RASTER_HEIGHT
protected Resampling	resampling

Constructor Summary

Constructors

Constructor and Description
BaseElevationModel(ElevationModelDescriptor descriptor, Resampling resamplingMethod)

Method Summary

Modifier and Type	Method and Description
protected abstract void	createElevationFile(ElevationFile[][] elevationFiles, int x, int y, File demInstallDir)
void	dispose() Releases all of the resources used by this object instance and all of its owned children.
ElevationModelDescriptor	getDescriptor() Gets the descriptor of this DEM.
double	getElevation(GeoPos geoPos) Gets the elevation at the geographical coordinate in meters.
abstract GeoPos	getGeoPos(PixelPos pixelPos) Gets the geographical coordinates for the input pixel coordinates in the DEM reference system.
int	getHeight() Gets the raster's height.
PixelPos	getIndex(GeoPos geoPos) Gets the pixel index in the DEM reference system at the geographical coordinate in meters.
abstract double	getIndexX(GeoPos geoPos)
abstract double	getIndexY(GeoPos geoPos)
protected static ProductReaderPlugIn	getReaderPlugIn(String formatName)
Resampling	getResampling()
double	getSample(double pixelX, double pixelY) Gets the elevation at the point defined by (x,y) coordinates in DEM reference system.
boolean	getSamples(int[] xArray, int[] yArray, double[][] samples) Gets the elevations at the points defined by (x,y) coordinates in DEM reference system.
int	getWidth() Gets the raster's width.
protected void	setMaxCacheSize(int size)
void	updateCache(ElevationTile tile)

Methods inherited from class java.lang.Object

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

Field Detail

NUM_Y_TILES

protected final int NUM_Y_TILES

NUM_PIXELS_PER_TILE

protected final int NUM_PIXELS_PER_TILE

NO_DATA_VALUE

protected final double NO_DATA_VALUE

DEGREE_RES

protected final int DEGREE_RES

RASTER_HEIGHT

protected final int RASTER_HEIGHT

DEGREE_RES_BY_NUM_PIXELS_PER_TILE

protected final double DEGREE_RES_BY_NUM_PIXELS_PER_TILE

DEGREE_RES_BY_NUM_PIXELS_PER_TILEinv

protected final double DEGREE_RES_BY_NUM_PIXELS_PER_TILEinv

descriptor

protected final ElevationModelDescriptor descriptor

resampling

protected final Resampling resampling

Constructor Detail

BaseElevationModel

public BaseElevationModel(ElevationModelDescriptor descriptor,
                          Resampling resamplingMethod)

Method Detail

getResampling

public Resampling getResampling()

Specified by:

getResampling in interface ElevationModel

Returns:

The resampling method used.

getDescriptor

public ElevationModelDescriptor getDescriptor()

Description copied from interface: ElevationModel

Gets the descriptor of this DEM.

Specified by:

getDescriptor in interface ElevationModel

Returns:

the descriptor which is never null

setMaxCacheSize

protected void setMaxCacheSize(int size)

getElevation

public double getElevation(GeoPos geoPos)
                    throws Exception

Description copied from interface: ElevationModel

Gets the elevation at the geographical coordinate in meters.

Specified by:

getElevation in interface ElevationModel

Parameters:

geoPos - the geographical coordinate

Returns:

an elevation in meters, or the special value returned by ElevationModelDescriptor.getNoDataValue() if an elevation is not available

Throws:

Exception - if a non-runtime error occurs, e.g I/O error

getIndexX

public abstract double getIndexX(GeoPos geoPos)

getIndexY

public abstract double getIndexY(GeoPos geoPos)

getGeoPos

public abstract GeoPos getGeoPos(PixelPos pixelPos)

Description copied from interface: ElevationModel

Gets the geographical coordinates for the input pixel coordinates in the DEM reference system.

Specified by:

getGeoPos in interface ElevationModel

Parameters:

pixelPos - the pixel (x,y) coordinate

Returns:

(lat, lon) geographical coordinates in the reference system of a given DEM

getIndex

public PixelPos getIndex(GeoPos geoPos)

Description copied from interface: ElevationModel

Gets the pixel index in the DEM reference system at the geographical coordinate in meters.

Specified by:

getIndex in interface ElevationModel

Parameters:

geoPos - the geographical coordinate

Returns:

(x, y) coordinates in the reference system of a given DEM

getWidth

public int getWidth()

Description copied from interface: Resampling.Raster

Gets the raster's width.

Specified by:

getWidth in interface Resampling.Raster

Returns:

the raster's width

getHeight

public int getHeight()

Description copied from interface: Resampling.Raster

Gets the raster's height.

Specified by:

getHeight in interface Resampling.Raster

Returns:

the raster's height

updateCache

public void updateCache(ElevationTile tile)

getSample

public final double getSample(double pixelX,
                              double pixelY)
                       throws Exception

Description copied from interface: ElevationModel

Gets the elevation at the point defined by (x,y) coordinates in DEM reference system. This method does not interpolated the elevation map!

Specified by:

getSample in interface ElevationModel

Parameters:

pixelX - coordinate

pixelY - coordinate

Returns:

an elevation in meters, or the special value returned by ElevationModelDescriptor.getNoDataValue() if an elevation is not available

Throws:

Exception - if a non-runtime error occurs, e.g I/O error

getSamples

public final boolean getSamples(int[] xArray,
                                int[] yArray,
                                double[][] samples)
                         throws Exception

Description copied from interface: ElevationModel

Gets the elevations at the points defined by (x,y) coordinates in DEM reference system. This method does not interpolated the elevation map!

Specified by:

getSamples in interface ElevationModel

Specified by:

getSamples in interface Resampling.Raster

Parameters:

xArray - coordinate

yArray - coordinate

samples - output elevation in meters, or the special value returned by ElevationModelDescriptor.getNoDataValue() if an elevation is not available

Returns:

false if all values are nodata value

Throws:

Exception - if a non-runtime error occurs, e.g I/O error

dispose

public void dispose()

Description copied from interface: ElevationModel

Releases all of the resources used by this object instance and all of its owned children. Its primary use is to allow the garbage collector to perform a vanilla job.

This method should be called only if it is for sure that this object instance will never be used again. The results of referencing an instance of this class after a call to dispose() are undefined.

Overrides of this method should always call super.dispose(); after disposing this instance.

Specified by:

dispose in interface ElevationModel

createElevationFile

protected abstract void createElevationFile(ElevationFile[][] elevationFiles,
                                            int x,
                                            int y,
                                            File demInstallDir)

getReaderPlugIn

protected static ProductReaderPlugIn getReaderPlugIn(String formatName)