gov.nasa.worldwind.data

Class GDALDataRaster

java.lang.Object

gov.nasa.worldwind.avlist.AVListImpl

gov.nasa.worldwind.data.AbstractDataRaster

gov.nasa.worldwind.data.GDALDataRaster

All Implemented Interfaces:

AVList, Cacheable, DataRaster, Disposable

public class GDALDataRaster
extends AbstractDataRaster
implements Cacheable

Field Summary

Fields

Modifier and Type	Field and Description
protected GDAL.Area	area
protected static int	DEFAULT_MAX_RASTER_SIZE_LIMIT
protected org.gdal.gdal.Dataset	dsVRT
protected java.io.File	srcFile
protected org.gdal.osr.SpatialReference	srs
protected java.lang.Object	usageLock

Fields inherited from class gov.nasa.worldwind.data.AbstractDataRaster

height, width

Constructor Summary

Constructors

Constructor and Description
GDALDataRaster(org.gdal.gdal.Dataset ds)
GDALDataRaster(java.lang.Object source) Opens a data raster
GDALDataRaster(java.lang.Object source, boolean quickReadingMode) Opens a data raster

Method Summary

Modifier and Type	Method and Description
protected org.gdal.gdal.Dataset	buildNonNorthUpDatasetFromOverview(int bestOverviewIdx, int destWidth, int destHeight)
protected org.gdal.gdal.Dataset	buildNorthUpDatasetFromOverview(Sector reqSector, int reqWidth, int reqHeight, int bestOverviewIdx, int srcWidth, int srcHeight)
protected java.lang.String	composeExceptionReason(java.lang.Throwable t)
protected static java.lang.String	convertAVListToString(AVList list)
protected org.gdal.gdal.Dataset	createCompatibleDataset(int width, int height, Sector sector, AVList destParams)
protected org.gdal.gdal.Dataset	createMaskDataset(int width, int height, Sector sector)
void	dispose() Disposes of any internal resources allocated by the object.
protected void	doDrawOnTo(DataRaster canvas)
protected DataRaster	doGetSubRaster(int roiWidth, int roiHeight, Sector roiSector, AVList roiParams)
void	drawOnTo(DataRaster canvas) Copies this raster into a specified raster.
protected static org.gdal.gdal.Band	findAlphaBand(org.gdal.gdal.Dataset ds)
protected org.gdal.gdal.Dataset	getBestSuitedDataset(int reqWidth, int reqHeight, Sector reqSector) The purpose of this method is to create the best suited dataset for the requested area.
protected static int	getMaxRasterSizeLimit()
AVList	getMetadata()
long	getSizeInBytes() Retrieves the approximate size of this object in bytes.
DataRaster	getSubRaster(AVList params) Builds a writable data raster for the requested region of interest (ROI)
protected void	init(org.gdal.gdal.Dataset ds, boolean quickReadingMode) Extracts metadata and sets next key/value pairs:
protected boolean	intersects(Sector reqSector)
protected org.gdal.osr.SpatialReference	readSpatialReference(org.gdal.gdal.Dataset ds)
void	setSector(Sector sector) Set a new extent to the data raster.
java.lang.String	toString()

Methods inherited from class gov.nasa.worldwind.data.AbstractDataRaster

computeClipRect, computeGeographicToRasterTransform, computeSourceToDestTransform, getHeight, getSector, getSubRaster, getWidth, setValue

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, 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.avlist.AVList

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

Field Detail

area

protected GDAL.Area area

DEFAULT_MAX_RASTER_SIZE_LIMIT

protected static final int DEFAULT_MAX_RASTER_SIZE_LIMIT

See Also:

Constant Field Values

dsVRT

protected org.gdal.gdal.Dataset dsVRT

srcFile

protected java.io.File srcFile

srs

protected org.gdal.osr.SpatialReference srs

usageLock

protected final java.lang.Object usageLock

Constructor Detail

GDALDataRaster

public GDALDataRaster(org.gdal.gdal.Dataset ds)
               throws java.lang.IllegalArgumentException

Throws:

java.lang.IllegalArgumentException

GDALDataRaster

public GDALDataRaster(java.lang.Object source)
               throws java.lang.IllegalArgumentException,
                      java.io.FileNotFoundException

Opens a data raster

Parameters:

source - the location of the local file, expressed as either a String path, a File, or a file URL.

Throws:

java.lang.IllegalArgumentException - if the source is null

java.io.FileNotFoundException - if the source (File) does not exist

GDALDataRaster

public GDALDataRaster(java.lang.Object source,
                      boolean quickReadingMode)
               throws java.lang.IllegalArgumentException,
                      java.io.FileNotFoundException

Opens a data raster

Parameters:

source - the location of the local file, expressed as either a String path, a File, or a file URL.

quickReadingMode - if quick reading mode is enabled GDAL will not spend much time on heavy calculations, like for example calculating Min/Max for entire elevation raster

Throws:

java.lang.IllegalArgumentException - if the source is null

java.io.FileNotFoundException - if the source (File) does not exist

Method Detail

buildNonNorthUpDatasetFromOverview

protected org.gdal.gdal.Dataset buildNonNorthUpDatasetFromOverview(int bestOverviewIdx,
                                                                   int destWidth,
                                                                   int destHeight)

buildNorthUpDatasetFromOverview

protected org.gdal.gdal.Dataset buildNorthUpDatasetFromOverview(Sector reqSector,
                                                                int reqWidth,
                                                                int reqHeight,
                                                                int bestOverviewIdx,
                                                                int srcWidth,
                                                                int srcHeight)

composeExceptionReason

protected java.lang.String composeExceptionReason(java.lang.Throwable t)

convertAVListToString

protected static java.lang.String convertAVListToString(AVList list)

createCompatibleDataset

protected org.gdal.gdal.Dataset createCompatibleDataset(int width,
                                                        int height,
                                                        Sector sector,
                                                        AVList destParams)

createMaskDataset

protected org.gdal.gdal.Dataset createMaskDataset(int width,
                                                  int height,
                                                  Sector sector)

dispose

public void dispose()

Description copied from interface: Disposable

Disposes of any internal resources allocated by the object.

Specified by:

dispose in interface Disposable

doDrawOnTo

protected void doDrawOnTo(DataRaster canvas)

doGetSubRaster

protected DataRaster doGetSubRaster(int roiWidth,
                                    int roiHeight,
                                    Sector roiSector,
                                    AVList roiParams)

drawOnTo

public void drawOnTo(DataRaster canvas)

Description copied from interface: DataRaster

Copies this raster into a specified raster.

Specified by:

drawOnTo in interface DataRaster

Parameters:

canvas - - the raster to copy into.

findAlphaBand

protected static org.gdal.gdal.Band findAlphaBand(org.gdal.gdal.Dataset ds)

getBestSuitedDataset

protected org.gdal.gdal.Dataset getBestSuitedDataset(int reqWidth,
                                                     int reqHeight,
                                                     Sector reqSector)

The purpose of this method is to create the best suited dataset for the requested area. The dataset may contain overviews, so instead of retrieving raster from the highest resolution source, we will compose a temporary dataset from an overview, and/or we may clip only the requested area. This will accelerate reprojection (if needed), because the reprojection will be done on much smaller dataset.

Parameters:

reqWidth - width of the requested area

reqHeight - height of the requested area

reqSector - sector of the requested area

Returns:

a dataset with the best suitable raster for the request

getMaxRasterSizeLimit

protected static int getMaxRasterSizeLimit()

getMetadata

public AVList getMetadata()

getSizeInBytes

public long getSizeInBytes()

Description copied from interface: Cacheable

Retrieves the approximate size of this object in bytes. Implementors are encouraged to calculate the exact size for smaller objects, but use approximate values for objects that include such large components that the approximation would produce an error so small that the extra computation would be wasteful.

Specified by:

getSizeInBytes in interface Cacheable

Returns:

this Cacheable object's size in bytes

getSubRaster

public DataRaster getSubRaster(AVList params)

Builds a writable data raster for the requested region of interest (ROI)

Specified by:

getSubRaster in interface DataRaster

Overrides:

getSubRaster in class AbstractDataRaster

Parameters:

params - Required parameters are:

AVKey.HEIGHT as Integer, specifies a height of the desired ROI

AVKey.WIDTH as Integer, specifies a width of the desired ROI

AVKey.SECTOR as Sector, specifies an extent of the desired ROI

Optional parameters are:

AVKey.BAND_ORDER as array of integers, examples: for RGBA image: new int[] { 0, 1, 2, 3 }, or for ARGB image: new int[] { 3, 0, 1, 2 } , or if you want only RGB bands of the RGBA image: new int[] {0, 1, 2 }, or only Intensity (4th) band of the specific aerial image: new int[] { 3 }

Returns:

A writable data raster: BufferedImageRaster (if the source dataset is imagery) or ByteBufferRaster (if the source dataset is elevations)

init

protected void init(org.gdal.gdal.Dataset ds,
                    boolean quickReadingMode)

Extracts metadata and sets next key/value pairs:

AVKey.WIDTH - the maximum width of the image

AVKey.HEIGHT - the maximum height of the image

AVKey.COORDINATE_SYSTEM - one of the next values:

• AVKey.COORDINATE_SYSTEM_SCREEN
• AVKey.COORDINATE_SYSTEM_GEOGRAPHIC
• AVKey.COORDINATE_SYSTEM_PROJECTED

AVKey.SECTOR - in case of Geographic CS, contains a regular Geographic Sector defined by lat/lon coordinates of corners in case of Projected CS, contains a bounding box of the area

Parameters:

ds - GDAL's Dataset

quickReadingMode - if quick reading mode is enabled GDAL will not spend much time on heavy calculations, like for example calculating Min/Max for entire elevation raster

intersects

protected boolean intersects(Sector reqSector)

readSpatialReference

protected org.gdal.osr.SpatialReference readSpatialReference(org.gdal.gdal.Dataset ds)

setSector

public void setSector(Sector sector)
               throws java.lang.IllegalArgumentException

Set a new extent to the data raster. This operation is mostly required for rasters that does not have a georeferenced information. A new geo-transform matrix will be created. The coordinate system is set to Geographic.

Parameters:

sector - A valid sector instance

Throws:

java.lang.IllegalArgumentException - if the Sector is null

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object