QgsAlignRaster takes one or more raster layers and warps (resamples) them so they have the same: More...

#include <qgsalignraster.h>

Classes
struct	Item
	Definition of one raster layer for alignment. More...

struct	ProgressHandler
	Helper struct to be sub-classed for progress reporting. More...

struct	RasterInfo
	Utility class for gathering information about rasters. More...

Public Types
typedef QList< Item >	List

enum	ResampleAlg { RA_NearestNeighbour = 0, RA_Bilinear = 1, RA_Cubic = 2, RA_CubicSpline = 3, RA_Lanczos = 4, RA_Average = 5, RA_Mode = 6, RA_Max = 8, RA_Min = 9, RA_Median = 10, RA_Q1 = 11, RA_Q3 = 12 }
	Resampling algorithm to be used (equivalent to GDAL's enum GDALResampleAlg) More...

Public Member Functions
	QgsAlignRaster ()

QgsRectangle	alignedRasterExtent () const
	Return expected extent of the resulting aligned raster. More...

QSize	alignedRasterSize () const
	Return expected size of the resulting aligned raster. More...

QSizeF	cellSize () const
	Get output cell size. More...

bool	checkInputParameters ()
	Determine destination extent from the input rasters and calculate derived values. More...

QgsRectangle	clipExtent () const
	Get clipping extent (region of interest). More...

QString	destinationCRS () const
	Get the output CRS in WKT format. More...

void	dump () const
	write contents of the object to standard error stream - for debugging More...

QString	errorMessage () const
	Return error from a previous run() call. More...

QPointF	gridOffset () const

ProgressHandler *	progressHandler () const
	Get associated progress handler. May be nullptr (default) More...

List	rasters () const
	Get list of rasters that will be aligned. More...

bool	run ()
	Run the alignment process. More...

void	setCellSize (double x, double y)
	Set output cell size. More...

void	setCellSize (QSizeF size)
	Set output cell size. More...

void	setClipExtent (double xmin, double ymin, double xmax, double ymax)
	Configure clipping extent (region of interest). More...

void	setClipExtent (const QgsRectangle &extent)
	Configure clipping extent (region of interest). More...

void	setDestinationCRS (const QString &crsWkt)
	Set the output CRS in WKT format. More...

void	setGridOffset (QPointF offset)

bool	setParametersFromRaster (const RasterInfo &rasterInfo, const QString &customCRSWkt=QString(), QSizeF customCellSize=QSizeF(), QPointF customGridOffset=QPointF(-1, -1))
	Set destination CRS, cell size and grid offset from a raster file. More...

bool	setParametersFromRaster (const QString &filename, const QString &customCRSWkt=QString(), QSizeF customCellSize=QSizeF(), QPointF customGridOffset=QPointF(-1, -1))
	Overridden variant for convenience, taking filename instead RasterInfo object. More...

void	setProgressHandler (ProgressHandler *progressHandler)
	Assign a progress handler instance. Does not take ownership. nullptr can be passed. More...

void	setRasters (const List &list)
	Set list of rasters that will be aligned. More...

int	suggestedReferenceLayer () const
	Return index of the layer which has smallest cell size (returns -1 on error) More...

Protected Member Functions
bool	createAndWarp (const Item &raster)
	Internal function for processing of one raster (1. create output, 2. do the alignment) More...

Static Protected Member Functions
static bool	suggestedWarpOutput (const RasterInfo &info, const QString &destWkt, QSizeF cellSize=nullptr, QPointF gridOffset=nullptr, QgsRectangle *rect=nullptr)
	Determine suggested output of raster warp to a different CRS. Returns true on success. More...

Protected Attributes
double	mCellSizeX
	Destination cell size. More...

double	mCellSizeY

double	mClipExtent [4]
	Optional clip extent: sets "requested area" which be extended to fit the raster grid. More...

QString	mCrsWkt
	Destination CRS - stored in well-known text (WKT) format. More...

QString	mErrorMessage
	Last error message from run() More...

double	mGeoTransform [6]
	Computed geo-transform. More...

double	mGridOffsetX
	Destination grid offset - expected to be in interval <0,cellsize) More...

double	mGridOffsetY

ProgressHandler *	mProgressHandler
	Object that facilitates reporting of progress / cancellation. More...

List	mRasters
	List of rasters to be aligned (with their output files and other options) More...

int	mXSize
	Computed raster grid width/height. More...

int	mYSize

Detailed Description

QgsAlignRaster takes one or more raster layers and warps (resamples) them so they have the same:

coordinate reference system
cell size and raster size
offset of the raster grid

Note: added in QGIS 2.12

Definition at line 39 of file qgsalignraster.h.

Member Typedef Documentation

◆ List

typedef QList<Item> QgsAlignRaster::List

Definition at line 140 of file qgsalignraster.h.

Member Enumeration Documentation

◆ ResampleAlg

enum QgsAlignRaster::ResampleAlg

Resampling algorithm to be used (equivalent to GDAL's enum GDALResampleAlg)

Note: RA_Max, RA_Min, RA_Median, RA_Q1 and RA_Q3 are available on GDAL >= 2.0 builds only

Enumerator
RA_NearestNeighbour	Nearest neighbour (select on one input pixel)
RA_Bilinear	Bilinear (2x2 kernel)
RA_Cubic	Cubic Convolution Approximation (4x4 kernel)
RA_CubicSpline	Cubic B-Spline Approximation (4x4 kernel)
RA_Lanczos	Lanczos windowed sinc interpolation (6x6 kernel)
RA_Average	Average (computes the average of all non-NODATA contributing pixels)
RA_Mode	Mode (selects the value which appears most often of all the sampled points)
RA_Max	Maximum (selects the maximum of all non-NODATA contributing pixels)
RA_Min	Minimum (selects the minimum of all non-NODATA contributing pixels)
RA_Median	Median (selects the median of all non-NODATA contributing pixels)
RA_Q1	First quartile (selects the first quartile of all non-NODATA contributing pixels)
RA_Q3	Third quartile (selects the third quartile of all non-NODATA contributing pixels)

Definition at line 99 of file qgsalignraster.h.

Constructor & Destructor Documentation

◆ QgsAlignRaster()

QgsAlignRaster::QgsAlignRaster ( )

Definition at line 119 of file qgsalignraster.cpp.

Member Function Documentation

◆ alignedRasterExtent()

QgsRectangle QgsAlignRaster::alignedRasterExtent ( ) const

Return expected extent of the resulting aligned raster.

Note: first need to run checkInputParameters() which returns with success

Definition at line 352 of file qgsalignraster.cpp.

◆ alignedRasterSize()

QSize QgsAlignRaster::alignedRasterSize ( ) const

Return expected size of the resulting aligned raster.

Note: first need to run checkInputParameters() which returns with success

Definition at line 347 of file qgsalignraster.cpp.

◆ cellSize()

QSizeF QgsAlignRaster::cellSize ( ) const

inline

Get output cell size.

Definition at line 171 of file qgsalignraster.h.

◆ checkInputParameters()

bool QgsAlignRaster::checkInputParameters ( )

Determine destination extent from the input rasters and calculate derived values.

Returns: true on success, sets error on error (see errorMessage())

Definition at line 239 of file qgsalignraster.cpp.

◆ clipExtent()

QgsRectangle QgsAlignRaster::clipExtent ( ) const

Get clipping extent (region of interest).

No extra clipping is done if the rectangle is null

Definition at line 147 of file qgsalignraster.cpp.

◆ createAndWarp()

bool QgsAlignRaster::createAndWarp ( const Item & raster )

protected

Internal function for processing of one raster (1. create output, 2. do the alignment)

Definition at line 421 of file qgsalignraster.cpp.

◆ destinationCRS()

QString QgsAlignRaster::destinationCRS ( ) const

inline

Get the output CRS in WKT format.

Definition at line 176 of file qgsalignraster.h.

◆ dump()

void QgsAlignRaster::dump ( ) const

write contents of the object to standard error stream - for debugging

Definition at line 377 of file qgsalignraster.cpp.

◆ errorMessage()

QString QgsAlignRaster::errorMessage ( ) const

inline

Return error from a previous run() call.

Error message is empty if run() succeeded (returned true)

Definition at line 219 of file qgsalignraster.h.

◆ gridOffset()

QPointF QgsAlignRaster::gridOffset ( ) const

inline

Definition at line 164 of file qgsalignraster.h.

◆ progressHandler()

ProgressHandler* QgsAlignRaster::progressHandler ( ) const

inline

Get associated progress handler. May be nullptr (default)

Definition at line 156 of file qgsalignraster.h.

◆ rasters()

List QgsAlignRaster::rasters ( ) const

inline

Get list of rasters that will be aligned.

Definition at line 161 of file qgsalignraster.h.

◆ run()

bool QgsAlignRaster::run ( )

Run the alignment process.

Returns: true on success, sets error on error (see errorMessage())

Definition at line 358 of file qgsalignraster.cpp.

◆ setCellSize() [1/2]

void QgsAlignRaster::setCellSize	(	double	x,
		double	y
	)

inline

Set output cell size.

Definition at line 167 of file qgsalignraster.h.

◆ setCellSize() [2/2]

void QgsAlignRaster::setCellSize ( QSizeF size )

inline

Set output cell size.

Definition at line 169 of file qgsalignraster.h.

◆ setClipExtent() [1/2]

void QgsAlignRaster::setClipExtent	(	double	xmin,
		double	ymin,
		double	xmax,
		double	ymax
	)

Configure clipping extent (region of interest).

No extra clipping is done if the rectangle is null

Definition at line 133 of file qgsalignraster.cpp.

◆ setClipExtent() [2/2]

void QgsAlignRaster::setClipExtent ( const QgsRectangle & extent )

Configure clipping extent (region of interest).

No extra clipping is done if the rectangle is null

Definition at line 141 of file qgsalignraster.cpp.

◆ setDestinationCRS()

void QgsAlignRaster::setDestinationCRS ( const QString & crsWkt )

inline

Set the output CRS in WKT format.

Definition at line 174 of file qgsalignraster.h.

◆ setGridOffset()

void QgsAlignRaster::setGridOffset ( QPointF offset )

inline

Definition at line 163 of file qgsalignraster.h.

◆ setParametersFromRaster() [1/2]

bool QgsAlignRaster::setParametersFromRaster	(	const RasterInfo &	rasterInfo,
		const QString &	customCRSWkt = `QString()`,
		QSizeF	customCellSize = `QSizeF()`,
		QPointF	customGridOffset = `QPointF( -1, -1 )`
	)

Set destination CRS, cell size and grid offset from a raster file.

The user may provide custom values for some of the parameters - in such case only the remaining parameters are calculated.

If default CRS is used, the parameters are set according to the raster file's geo-transform. If a custom CRS is provided, suggested reprojection is calculated first (using GDAL) in order to determine suitable defaults for cell size and grid offset.

Returns: true on success (may fail if it is not possible to reproject raster to given CRS)

Definition at line 159 of file qgsalignraster.cpp.

◆ setParametersFromRaster() [2/2]

bool QgsAlignRaster::setParametersFromRaster	(	const QString &	filename,
		const QString &	customCRSWkt = `QString()`,
		QSizeF	customCellSize = `QSizeF()`,
		QPointF	customGridOffset = `QPointF( -1, -1 )`
	)

Overridden variant for convenience, taking filename instead RasterInfo object.

See the other variant for details.

Definition at line 154 of file qgsalignraster.cpp.

◆ setProgressHandler()

void QgsAlignRaster::setProgressHandler ( ProgressHandler * progressHandler )

inline

Assign a progress handler instance. Does not take ownership. nullptr can be passed.

Definition at line 154 of file qgsalignraster.h.

◆ setRasters()

void QgsAlignRaster::setRasters ( const List & list )

inline

Set list of rasters that will be aligned.

Definition at line 159 of file qgsalignraster.h.

◆ suggestedReferenceLayer()

int QgsAlignRaster::suggestedReferenceLayer ( ) const

Return index of the layer which has smallest cell size (returns -1 on error)

Definition at line 390 of file qgsalignraster.cpp.

◆ suggestedWarpOutput()

bool QgsAlignRaster::suggestedWarpOutput	(	const RasterInfo &	info,
		const QString &	destWkt,
		QSizeF *	cellSize = `nullptr`,
		QPointF *	gridOffset = `nullptr`,
		QgsRectangle *	rect = `nullptr`
	)

staticprotected

Determine suggested output of raster warp to a different CRS. Returns true on success.

Definition at line 518 of file qgsalignraster.cpp.

Member Data Documentation

◆ mCellSizeX

double QgsAlignRaster::mCellSizeX

protected

Destination cell size.

Definition at line 251 of file qgsalignraster.h.

◆ mCellSizeY

double QgsAlignRaster::mCellSizeY

protected

Definition at line 251 of file qgsalignraster.h.

◆ mClipExtent

double QgsAlignRaster::mClipExtent[4]

protected

Optional clip extent: sets "requested area" which be extended to fit the raster grid.

Clipping not done if all coords are zeroes.

Definition at line 257 of file qgsalignraster.h.

◆ mCrsWkt

QString QgsAlignRaster::mCrsWkt

protected

Destination CRS - stored in well-known text (WKT) format.

Definition at line 249 of file qgsalignraster.h.

◆ mErrorMessage

QString QgsAlignRaster::mErrorMessage

protected

Last error message from run()

Definition at line 243 of file qgsalignraster.h.

◆ mGeoTransform

double QgsAlignRaster::mGeoTransform[6]

protected

Computed geo-transform.

Definition at line 262 of file qgsalignraster.h.

◆ mGridOffsetX

double QgsAlignRaster::mGridOffsetX

protected

Destination grid offset - expected to be in interval <0,cellsize)

Definition at line 253 of file qgsalignraster.h.

◆ mGridOffsetY

double QgsAlignRaster::mGridOffsetY

protected

Definition at line 253 of file qgsalignraster.h.

◆ mProgressHandler

ProgressHandler* QgsAlignRaster::mProgressHandler

protected

Object that facilitates reporting of progress / cancellation.

Definition at line 240 of file qgsalignraster.h.

◆ mRasters

List QgsAlignRaster::mRasters

protected

List of rasters to be aligned (with their output files and other options)

Definition at line 246 of file qgsalignraster.h.

◆ mXSize

int QgsAlignRaster::mXSize

protected

Computed raster grid width/height.

Definition at line 264 of file qgsalignraster.h.

◆ mYSize

int QgsAlignRaster::mYSize

protected

Definition at line 264 of file qgsalignraster.h.

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

/tmp/buildd/qgis-2.18.21+99unstable/src/analysis/raster/qgsalignraster.h
/tmp/buildd/qgis-2.18.21+99unstable/src/analysis/raster/qgsalignraster.cpp

Classes

Public Types

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Detailed Description

Member Typedef Documentation

◆ List

Member Enumeration Documentation

◆ ResampleAlg

Constructor & Destructor Documentation

◆ QgsAlignRaster()

Member Function Documentation

◆ alignedRasterExtent()

◆ alignedRasterSize()

◆ cellSize()

◆ checkInputParameters()

◆ clipExtent()

◆ createAndWarp()

◆ destinationCRS()

◆ dump()

◆ errorMessage()

◆ gridOffset()

◆ progressHandler()

◆ rasters()

◆ run()

◆ setCellSize() [1/2]

◆ setCellSize() [2/2]

◆ setClipExtent() [1/2]

◆ setClipExtent() [2/2]

◆ setDestinationCRS()

◆ setGridOffset()

◆ setParametersFromRaster() [1/2]

◆ setParametersFromRaster() [2/2]

◆ setProgressHandler()

◆ setRasters()

◆ suggestedReferenceLayer()

◆ suggestedWarpOutput()

Member Data Documentation

◆ mCellSizeX

◆ mCellSizeY

◆ mClipExtent

◆ mCrsWkt

◆ mErrorMessage

◆ mGeoTransform

◆ mGridOffsetX

◆ mGridOffsetY

◆ mProgressHandler

◆ mRasters

◆ mXSize

◆ mYSize