QgsRasterDataProvider Class Reference

Base class for raster data providers. More...

#include <qgsrasterdataprovider.h>

Inheritance diagram for QgsRasterDataProvider:

Signals
void	progress (int theType, double theProgress, QString theMessage)
	Emit a signal to notify of the progress event.
void	progressUpdate (int theProgress)
Signals inherited from QgsDataProvider
void	fullExtentCalculated ()
	This is emitted whenever the worker thread has fully calculated the PostGIS extents for this layer, and its event has been received by this provider.
void	dataChanged ()
	This is emitted whenever an asynchronous operation has finished and the data should be redrawn.
void	dataChanged (int changed)
	This is emitted whenever data or metadata (e.g.

Public Member Functions
	QgsRasterDataProvider ()
	QgsRasterDataProvider (const QString &uri)
virtual	~QgsRasterDataProvider ()
virtual QgsRasterInterface *	clone () const =0
	Clone itself, create deep copy.
bool	setInput (QgsRasterInterface *input)
	Set input.
virtual QImage *	draw (const QgsRectangle &viewExtent, int pixelWidth, int pixelHeight)=0
	Renders the layer as an image.
virtual QgsRectangle	extent ()=0
	Get the extent of the data source.
virtual QGis::DataType	dataType (int bandNo) const =0
	Returns data type for the band specified by number.
virtual QGis::DataType	srcDataType (int bandNo) const =0
	Returns source data type for the band specified by number, source data type may be shorter than dataType.
virtual int	colorInterpretation (int theBandNo) const
	Returns data type for the band specified by number.
QString	colorName (int colorInterpretation) const
virtual bool	reload ()
	Reload data (data could change)
virtual QString	colorInterpretationName (int theBandNo) const
virtual double	bandScale (int bandNo) const
	Read band scale for raster value @note added in 2.3.
virtual double	bandOffset (int bandNo) const
	Read band offset for raster value @note added in 2.3.
virtual QgsRasterBlock *	block (int theBandNo, const QgsRectangle &theExtent, int theWidth, int theHeight)
	Read block of data using given extent and size.
virtual bool	srcHasNoDataValue (int bandNo) const
virtual bool	useSrcNoDataValue (int bandNo) const
	Get source nodata value usage.
virtual void	setUseSrcNoDataValue (int bandNo, bool use)
	Set source nodata value usage.
virtual double	srcNoDataValue (int bandNo) const
	Value representing no data value.
virtual void	setUserNoDataValue (int bandNo, QgsRasterRangeList noData)
virtual QgsRasterRangeList	userNoDataValues (int bandNo) const
	Get list of user no data value ranges.
virtual QList < QgsColorRampShader::ColorRampItem >	colorTable (int bandNo) const
virtual QStringList	subLayers () const
	Returns the sublayers of this layer - useful for providers that manage their own layers, such as WMS.
virtual QImage	getLegendGraphic (double scale=0, bool forceRefresh=false)
	Returns the legend rendered as pixmap useful for that layer that need to get legend layer remotly as WMS.
virtual QString	buildPyramids (const QList< QgsRasterPyramid > &thePyramidList, const QString &theResamplingMethod="NEAREST", QgsRaster::RasterPyramidsFormat theFormat=QgsRaster::PyramidsGTiff, const QStringList &theConfigOptions=QStringList())
	Create pyramid overviews.
virtual QList< QgsRasterPyramid >	buildPyramidList (QList< int > overviewList=QList< int >())
	Accessor for ths raster layers pyramid list.
bool	hasPyramids ()
	Returns true if raster has at least one populated histogram.
virtual QString	metadata ()=0
	Get metadata in a format suitable for feeding directly into a subset of the GUI raster properties "Metadata" tab.
virtual QgsRasterIdentifyResult	identify (const QgsPoint &thePoint, QgsRaster::IdentifyFormat theFormat, const QgsRectangle &theExtent=QgsRectangle(), int theWidth=0, int theHeight=0)
	Identify raster value(s) found on the point position.
virtual QString	lastErrorTitle ()=0
	Returns the caption error text for the last error in this provider.
virtual QString	lastError ()=0
	Returns the verbose error text for the last error in this provider.
virtual QString	lastErrorFormat ()
	Returns the format of the error text for the last error in this provider.
int	dpi () const
	Returns the dpi of the output device.
void	setDpi (int dpi)
	Sets the output device resolution.
virtual QDateTime	timestamp () const
	Time stamp of data source in the moment when data/metadata were loaded by provider.
virtual QDateTime	dataTimestamp () const
	Current time stamp of data source.
virtual bool	write (void *data, int band, int width, int height, int xOffset, int yOffset)
	Writes into the provider datasource.
virtual bool	setNoDataValue (int bandNo, double noDataValue)
	Set no data value on created dataset.
virtual bool	remove ()
	Remove dataset.
virtual QString	validateCreationOptions (const QStringList &createOptions, QString format)
	Validates creation options for a specific dataset and destination format.
virtual QString	validatePyramidsConfigOptions (QgsRaster::RasterPyramidsFormat pyramidsFormat, const QStringList &theConfigOptions, const QString &fileFormat)
	Validates pyramid creation options for a specific dataset and destination format.
Public Member Functions inherited from QgsDataProvider
	QgsDataProvider (QString const &uri="")
virtual	~QgsDataProvider ()
	We need this so the subclass destructors get called.
virtual QgsCoordinateReferenceSystem	crs ()=0
virtual void	setDataSourceUri (const QString &uri)
	Set the data source specification.
virtual QString	dataSourceUri () const
	Get the data source specification.
virtual bool	isValid ()=0
	Returns true if this is a valid layer.
virtual void	updateExtents ()
	Update the extents of the layer.
virtual bool	setSubsetString (QString subset, bool updateFeatureCount=true)
	Set the subset string used to create a subset of features in the layer.
virtual bool	supportsSubsetString ()
	provider supports setting of subset strings
virtual QString	subsetString ()
	Returns the subset definition string (typically sql) currently in use by the layer and used by the provider to limit the feature set.
virtual QStringList	subLayerStyles () const
	Sub-layer styles for each sub-layer handled by this provider, in order from bottom to top.
virtual uint	subLayerCount () const
	return the number of layers for the current data source
virtual void	setLayerOrder (const QStringList &layers)
	Reorder the list of layer names to be rendered by this provider (in order from bottom to top)
virtual void	setSubLayerVisibility (const QString &name, bool vis)
	Set the visibility of the given sublayer name.
virtual QString	name () const =0
	return a provider name
virtual QString	description () const =0
	return description
virtual QString	fileVectorFilters () const
	return vector file filter string
virtual QString	fileRasterFilters () const
	return raster file filter string
virtual void	reloadData ()
	Reloads the data from the source.
virtual QgsError	error () const
	Get current status error.
Public Member Functions inherited from QgsRasterInterface
	QgsRasterInterface (QgsRasterInterface *input=0)
virtual	~QgsRasterInterface ()
virtual int	capabilities () const
	Returns a bitmask containing the supported capabilities.
QString	capabilitiesString () const
	Returns the above in friendly format.
int	dataTypeSize (int bandNo)
virtual int	bandCount () const =0
	Get number of bands.
virtual int	xBlockSize () const
	Get block size.
virtual int	yBlockSize () const
virtual int	xSize () const
	Get raster size.
virtual int	ySize () const
virtual QString	generateBandName (int theBandNumber) const
	helper function to create zero padded band names
virtual QgsRasterInterface *	input () const
	Current input.
virtual bool	on () const
	Is on/off.
virtual void	setOn (bool on)
	Set on/off.
virtual const QgsRasterInterface *	srcInput () const
	Get source / raw input, the first in pipe, usually provider.
virtual QgsRasterInterface *	srcInput ()
virtual QgsRasterBandStats	bandStatistics (int theBandNo, int theStats=QgsRasterBandStats::All, const QgsRectangle &theExtent=QgsRectangle(), int theSampleSize=0)
	Get band statistics.
virtual bool	hasStatistics (int theBandNo, int theStats=QgsRasterBandStats::All, const QgsRectangle &theExtent=QgsRectangle(), int theSampleSize=0)
	Returns true if histogram is available (cached, already calculated).
virtual QgsRasterHistogram	histogram (int theBandNo, int theBinCount=0, double theMinimum=std::numeric_limits< double >::quiet_NaN(), double theMaximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &theExtent=QgsRectangle(), int theSampleSize=0, bool theIncludeOutOfRange=false)
	Get histogram.
virtual bool	hasHistogram (int theBandNo, int theBinCount, double theMinimum=std::numeric_limits< double >::quiet_NaN(), double theMaximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &theExtent=QgsRectangle(), int theSampleSize=0, bool theIncludeOutOfRange=false)
	Returns true if histogram is available (cached, already calculated), the parameters are the same as in histogram()
virtual void	cumulativeCut (int theBandNo, double theLowerCount, double theUpperCount, double &theLowerValue, double &theUpperValue, const QgsRectangle &theExtent=QgsRectangle(), int theSampleSize=0)
	Find values for cumulative pixel count cut.
virtual void	writeXML (QDomDocument &doc, QDomElement &parentElem) const
	Write base class members to xml.
virtual void	readXML (const QDomElement &filterElem)
	Sets base class members from xml.

Static Public Member Functions
static QgsRasterDataProvider *	create (const QString &providerKey, const QString &uri, const QString &format, int nBands, QGis::DataType type, int width, int height, double *geoTransform, const QgsCoordinateReferenceSystem &crs, QStringList createOptions=QStringList())
	Creates a new dataset with mDataSourceURI.
static QList< QPair< QString, QString > >	pyramidResamplingMethods (QString providerKey)
	Returns a list of pyramid resampling method name and label pairs for given provider.
static QString	identifyFormatName (QgsRaster::IdentifyFormat format)
static QgsRaster::IdentifyFormat	identifyFormatFromName (QString formatName)
static QString	identifyFormatLabel (QgsRaster::IdentifyFormat format)
static Capability	identifyFormatToCapability (QgsRaster::IdentifyFormat format)

Protected Member Functions
virtual void	readBlock (int bandNo, int xBlock, int yBlock, void *data)
	Read block of data.
virtual void	readBlock (int bandNo, QgsRectangle const &viewExtent, int width, int height, void *data)
	Read block of data using give extent and size.
bool	userNoDataValuesContains (int bandNo, double value) const
	Returns true if user no data contains value.
void	copyBaseSettings (const QgsRasterDataProvider &other)
	Copy member variables from other raster data provider.
Protected Member Functions inherited from QgsDataProvider
void	appendError (const QgsErrorMessage &theMessage)
	Add error message.
void	setError (const QgsError &theError)
	Set error message.
Protected Member Functions inherited from QgsRasterInterface
void	initHistogram (QgsRasterHistogram &theHistogram, int theBandNo, int theBinCount=0, double theMinimum=std::numeric_limits< double >::quiet_NaN(), double theMaximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &theExtent=QgsRectangle(), int theSampleSize=0, bool theIncludeOutOfRange=false)
	Fill in histogram defaults if not specified.
void	initStatistics (QgsRasterBandStats &theStatistics, int theBandNo, int theStats=QgsRasterBandStats::All, const QgsRectangle &theExtent=QgsRectangle(), int theBinCount=0)
	Fill in statistics defaults if not specified.

Static Protected Member Functions
static QStringList	cStringList2Q_ (char **stringList)
static QString	makeTableCell (const QString &value)
static QString	makeTableCells (const QStringList &values)
static void	initPyramidResamplingDefs ()

Protected Attributes
int	mDpi
	Dots per inch.
QList< double >	mSrcNoDataValue
	Source no data value is available and is set to be used or internal no data is available.
QList< bool >	mSrcHasNoDataValue
	Source no data value exists.
QList< bool >	mUseSrcNoDataValue
	Use source nodata value.
QList< QgsRasterRangeList >	mUserNoDataValue
	List of lists of user defined additional no data values for each band, indexed from 0.
QgsRectangle	mExtent
Protected Attributes inherited from QgsDataProvider
QDateTime	mTimestamp
	Timestamp of data in the moment when the data were loaded by provider.
QgsError	mError
	Error.
Protected Attributes inherited from QgsRasterInterface
QgsRasterInterface *	mInput
QList< QgsRasterBandStats >	mStatistics
	List of cached statistics, all bands mixed.
QList< QgsRasterHistogram >	mHistograms
	List of cached histograms, all bands mixed.
bool	mOn

Static Protected Attributes
static QStringList	mPyramidResamplingListGdal
static QgsStringMap	mPyramidResamplingMapGdal

Additional Inherited Members
Public Types inherited from QgsDataProvider
enum	DataCapability {   NoDataCapabilities = 0, File = 1, Dir = 1 << 1, Database = 1 << 2,   Net = 1 << 3 }
Public Types inherited from QgsRasterInterface
enum	Capability {   NoCapabilities = 0, Size = 1 << 1, Create = 1 << 2, Remove = 1 << 3,   BuildPyramids = 1 << 4, Identify = 1 << 5, IdentifyValue = 1 << 6, IdentifyText = 1 << 7,   IdentifyHtml = 1 << 8, IdentifyFeature = 1 << 9 }
	If you add to this, please also add to capabilitiesString() More...

Detailed Description

Base class for raster data providers.

Constructor & Destructor Documentation

QgsRasterDataProvider::QgsRasterDataProvider

(

)

QgsRasterDataProvider::QgsRasterDataProvider

(

const QString &

uri

)

virtual QgsRasterDataProvider::~QgsRasterDataProvider ( )

inlinevirtual

Member Function Documentation

virtual double QgsRasterDataProvider::bandOffset ( int  bandNo ) const

inlinevirtual

Read band offset for raster value @note added in 2.3.

virtual double QgsRasterDataProvider::bandScale ( int  bandNo ) const

inlinevirtual

Read band scale for raster value @note added in 2.3.

QgsRasterBlock * QgsRasterDataProvider::block ( int  theBandNo, const QgsRectangle &  theExtent, int  theWidth, int  theHeight  )

virtual

Read block of data using given extent and size.

Implements QgsRasterInterface.

virtual QList<QgsRasterPyramid> QgsRasterDataProvider::buildPyramidList ( QList< int >  overviewList = QList<int>() )

inlinevirtual

Accessor for ths raster layers pyramid list.

Parameters

overviewList

used to construct the pyramid list (optional), when empty the list is defined by the provider. A pyramid list defines the POTENTIAL pyramids that can be in a raster. To know which of the pyramid layers ACTUALLY exists you need to look at the existsFlag member in each struct stored in the list.

virtual QString QgsRasterDataProvider::buildPyramids ( const QList< QgsRasterPyramid > &  thePyramidList, const QString &  theResamplingMethod = "NEAREST", QgsRaster::RasterPyramidsFormat  theFormat = QgsRaster::PyramidsGTiff, const QStringList &  theConfigOptions = QStringList()  )

inlinevirtual

Create pyramid overviews.

virtual QgsRasterInterface* QgsRasterDataProvider::clone ( ) const

pure virtual

Clone itself, create deep copy.

Implements QgsRasterInterface.

virtual int QgsRasterDataProvider::colorInterpretation ( int  theBandNo ) const

inlinevirtual

Returns data type for the band specified by number.

virtual QString QgsRasterDataProvider::colorInterpretationName ( int  theBandNo ) const

inlinevirtual

QString QgsRasterDataProvider::colorName ( int  colorInterpretation ) const

inline

virtual QList<QgsColorRampShader::ColorRampItem> QgsRasterDataProvider::colorTable ( int  bandNo ) const

inlinevirtual

void QgsRasterDataProvider::copyBaseSettings ( const QgsRasterDataProvider &  other )

protected

Copy member variables from other raster data provider.

Useful for implementation of clone() method in subclasses

QgsRasterDataProvider * QgsRasterDataProvider::create ( const QString &  providerKey, const QString &  uri, const QString &  format, int  nBands, QGis::DataType  type, int  width, int  height, double *  geoTransform, const QgsCoordinateReferenceSystem &  crs, QStringList  createOptions = QStringList()  )

static

Creates a new dataset with mDataSourceURI.

QStringList QgsRasterDataProvider::cStringList2Q_ ( char **  stringList )

staticprotected

virtual QDateTime QgsRasterDataProvider::dataTimestamp ( ) const

inlinevirtual

Current time stamp of data source.

Reimplemented from QgsDataProvider.

virtual QGis::DataType QgsRasterDataProvider::dataType ( int  bandNo ) const

pure virtual

Returns data type for the band specified by number.

Implements QgsRasterInterface.

int QgsRasterDataProvider::dpi ( ) const

inline

Returns the dpi of the output device.

virtual QImage* QgsRasterDataProvider::draw ( const QgsRectangle &  viewExtent, int  pixelWidth, int  pixelHeight  )

pure virtual

Renders the layer as an image.

Note

When render caching (/qgis/enable_render_caching) is on the wms provider doesn't wait for the reply of the getmap request or all tiles replies and can return incomplete images. Temporarily disable render caching if you require the complete wms image in the first call.

virtual QgsRectangle QgsRasterDataProvider::extent ( )

pure virtual

Get the extent of the data source.

Returns

QgsRectangle containing the extent of the layer

Implements QgsDataProvider.

virtual QImage QgsRasterDataProvider::getLegendGraphic ( double  scale = 0, bool  forceRefresh = false  )

inlinevirtual

Returns the legend rendered as pixmap useful for that layer that need to get legend layer remotly as WMS.

bool QgsRasterDataProvider::hasPyramids

(

)

Returns true if raster has at least one populated histogram.

QgsRasterIdentifyResult QgsRasterDataProvider::identify ( const QgsPoint &  thePoint, QgsRaster::IdentifyFormat  theFormat, const QgsRectangle &  theExtent = QgsRectangle(), int  theWidth = 0, int  theHeight = 0  )

virtual

Identify raster value(s) found on the point position.

The context parameters theExtent, theWidth and theHeight are important to identify on the same zoom level as a displayed map and to do effective caching (WCS). If context params are not specified the highest resolution is used. capabilities() may be used to test if format is supported by provider. Values are set to 'no data' or empty string if point is outside data source extent.

Note

The arbitraryness of the returned document is enforced by WMS standards up to at least v1.3.0

Parameters

thePoint	coordinates in data source CRS
theFormat	result format
theExtent	context extent
theWidth	context width
theHeight	context height

Returns

QgsRaster::IdentifyFormatValue: map of values for each band, keys are band numbers (from 1). QgsRaster::IdentifyFormatFeature: map of QgsRasterFeatureList for each sublayer (WMS) - TODO: it is not consistent with QgsRaster::IdentifyFormatValue. QgsRaster::IdentifyFormatHtml: map of HTML strings for each sublayer (WMS). Empty if failed or there are no results (TODO: better error reporting).

QgsRaster::IdentifyFormat QgsRasterDataProvider::identifyFormatFromName ( QString  formatName )

static

QString QgsRasterDataProvider::identifyFormatLabel ( QgsRaster::IdentifyFormat  format )

static

QString QgsRasterDataProvider::identifyFormatName ( QgsRaster::IdentifyFormat  format )

static

QgsRasterInterface::Capability QgsRasterDataProvider::identifyFormatToCapability ( QgsRaster::IdentifyFormat  format )

static

static void QgsRasterDataProvider::initPyramidResamplingDefs ( )

staticprotected

virtual QString QgsRasterDataProvider::lastError ( )

pure virtual

Returns the verbose error text for the last error in this provider.

If an operation returns 0 (e.g. draw()), this function returns the text of the error associated with the failure. Interactive users of this provider can then, for example, call a QMessageBox to display the contents.

QString QgsRasterDataProvider::lastErrorFormat ( )

virtual

Returns the format of the error text for the last error in this provider.

virtual QString QgsRasterDataProvider::lastErrorTitle ( )

pure virtual

Returns the caption error text for the last error in this provider.

If an operation returns 0 (e.g. draw()), this function returns the text of the error associated with the failure. Interactive users of this provider can then, for example, call a QMessageBox to display the contents.

QString QgsRasterDataProvider::makeTableCell ( const QString &  value )

staticprotected

QString QgsRasterDataProvider::makeTableCells ( const QStringList &  values )

staticprotected

QString QgsRasterDataProvider::metadata ( )

pure virtual

Get metadata in a format suitable for feeding directly into a subset of the GUI raster properties "Metadata" tab.

void QgsRasterDataProvider::progress ( int  theType, double  theProgress, QString  theMessage  )

signal

Emit a signal to notify of the progress event.

Emitted theProgress is in percents (0.0-100.0)

void QgsRasterDataProvider::progressUpdate ( int  theProgress )

signal

QList< QPair< QString, QString > > QgsRasterDataProvider::pyramidResamplingMethods ( QString  providerKey )

static

Returns a list of pyramid resampling method name and label pairs for given provider.

virtual void QgsRasterDataProvider::readBlock ( int  bandNo, int  xBlock, int  yBlock, void *  data  )

inlineprotectedvirtual

Read block of data.

Note

not available in python bindings

virtual void QgsRasterDataProvider::readBlock ( int  bandNo, QgsRectangle const &  viewExtent, int  width, int  height, void *  data  )

inlineprotectedvirtual

Read block of data using give extent and size.

Note

not available in python bindings

virtual bool QgsRasterDataProvider::reload ( )

inlinevirtual

Reload data (data could change)

virtual bool QgsRasterDataProvider::remove ( )

inlinevirtual

Remove dataset.

void QgsRasterDataProvider::setDpi ( int  dpi )

inline

Sets the output device resolution.

bool QgsRasterDataProvider::setInput ( QgsRasterInterface *  input )

inlinevirtual

Set input.

Returns true if set correctly, false if cannot use that input

Reimplemented from QgsRasterInterface.

virtual bool QgsRasterDataProvider::setNoDataValue ( int  bandNo, double  noDataValue  )

inlinevirtual

Set no data value on created dataset.

Parameters

bandNo	band number
noDataValue	no data value

void QgsRasterDataProvider::setUserNoDataValue ( int  bandNo, QgsRasterRangeList  noData  )

virtual

void QgsRasterDataProvider::setUseSrcNoDataValue ( int  bandNo, bool  use  )

virtual

Set source nodata value usage.

virtual QGis::DataType QgsRasterDataProvider::srcDataType ( int  bandNo ) const

pure virtual

Returns source data type for the band specified by number, source data type may be shorter than dataType.

Reimplemented from QgsRasterInterface.

virtual bool QgsRasterDataProvider::srcHasNoDataValue ( int  bandNo ) const

inlinevirtual

virtual double QgsRasterDataProvider::srcNoDataValue ( int  bandNo ) const

inlinevirtual

Value representing no data value.

virtual QStringList QgsRasterDataProvider::subLayers ( ) const

inlinevirtual

Returns the sublayers of this layer - useful for providers that manage their own layers, such as WMS.

Reimplemented from QgsDataProvider.

virtual QDateTime QgsRasterDataProvider::timestamp ( ) const

inlinevirtual

Time stamp of data source in the moment when data/metadata were loaded by provider.

Reimplemented from QgsDataProvider.

virtual QgsRasterRangeList QgsRasterDataProvider::userNoDataValues ( int  bandNo ) const

inlinevirtual

Get list of user no data value ranges.

bool QgsRasterDataProvider::userNoDataValuesContains ( int  bandNo, double  value  ) const

protected

Returns true if user no data contains value.

virtual bool QgsRasterDataProvider::useSrcNoDataValue ( int  bandNo ) const

inlinevirtual

Get source nodata value usage.

virtual QString QgsRasterDataProvider::validateCreationOptions ( const QStringList &  createOptions, QString  format  )

inlinevirtual

Validates creation options for a specific dataset and destination format.

Note

used by GDAL provider only

see also validateCreationOptionsFormat() in gdal provider for validating options based on format only

virtual QString QgsRasterDataProvider::validatePyramidsConfigOptions ( QgsRaster::RasterPyramidsFormat  pyramidsFormat, const QStringList &  theConfigOptions, const QString &  fileFormat  )

inlinevirtual

Validates pyramid creation options for a specific dataset and destination format.

Note

used by GDAL provider only

virtual bool QgsRasterDataProvider::write ( void *  data, int  band, int  width, int  height, int  xOffset, int  yOffset  )

inlinevirtual

Writes into the provider datasource.

Member Data Documentation

int QgsRasterDataProvider::mDpi

protected

Dots per inch.

Extended WMS (e.g. QGIS mapserver) support DPI dependent output and therefore are suited for printing. A value of -1 means it has not been set

QgsRectangle QgsRasterDataProvider::mExtent

protected

QStringList QgsRasterDataProvider::mPyramidResamplingListGdal

staticprotected

QgsStringMap QgsRasterDataProvider::mPyramidResamplingMapGdal

staticprotected

QList<bool> QgsRasterDataProvider::mSrcHasNoDataValue

protected

Source no data value exists.

QList<double> QgsRasterDataProvider::mSrcNoDataValue

protected

Source no data value is available and is set to be used or internal no data is available.

Used internally only Cell value representing original source no data. e.g. -9999, indexed from 0

QList< QgsRasterRangeList > QgsRasterDataProvider::mUserNoDataValue

protected

List of lists of user defined additional no data values for each band, indexed from 0.

QList<bool> QgsRasterDataProvider::mUseSrcNoDataValue

protected

Use source nodata value.

User can disable usage of source nodata value as nodata. It may happen that a value is wrongly given by GDAL as nodata (e.g. 0) and it has to be treated as regular value.

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The documentation for this class was generated from the following files:

• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/raster/qgsrasterdataprovider.h
• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/raster/qgsrasterdataprovider.cpp