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< QgsAlignRaster::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
	Returns the expected extent of the resulting aligned raster. More...

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

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

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

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

QString	destinationCrs () const
	Gets 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
	Returns the error from a previous run() call. More...

QPointF	gridOffset () const

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

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

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

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

void	setCellSize (QSizeF size)
	Sets 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)
	Sets 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)
	Sets list of rasters that will be aligned. More...

int	suggestedReferenceLayer () const
	Returns the 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 = nullptr
	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. More...

int	mYSize
	Computed raster grid height. More...

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

Since: QGIS 2.12

Definition at line 43 of file qgsalignraster.h.

Member Typedef Documentation

◆ List

typedef QList<QgsAlignRaster::Item> QgsAlignRaster::List

Definition at line 154 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 113 of file qgsalignraster.h.

Constructor & Destructor Documentation

◆ QgsAlignRaster()

QgsAlignRaster::QgsAlignRaster ( )

Definition at line 118 of file qgsalignraster.cpp.

Member Function Documentation

◆ alignedRasterExtent()

QgsRectangle QgsAlignRaster::alignedRasterExtent ( ) const

Returns the expected extent of the resulting aligned raster.

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

Definition at line 350 of file qgsalignraster.cpp.

◆ alignedRasterSize()

QSize QgsAlignRaster::alignedRasterSize ( ) const

Returns the expected size of the resulting aligned raster.

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

Definition at line 345 of file qgsalignraster.cpp.

◆ cellSize()

QSizeF QgsAlignRaster::cellSize ( ) const

inline

Gets output cell size.

Definition at line 188 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 237 of file qgsalignraster.cpp.

◆ clipExtent()

QgsRectangle QgsAlignRaster::clipExtent ( ) const

Gets clipping extent (region of interest).

No extra clipping is done if the rectangle is null

Definition at line 145 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

Gets the output CRS in WKT format.

Definition at line 193 of file qgsalignraster.h.

◆ dump()

void QgsAlignRaster::dump ( ) const

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

Definition at line 376 of file qgsalignraster.cpp.

◆ errorMessage()

QString QgsAlignRaster::errorMessage ( ) const

inline

Returns the error from a previous run() call.

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

Definition at line 260 of file qgsalignraster.h.

◆ gridOffset()

QPointF QgsAlignRaster::gridOffset ( ) const

inline

Definition at line 181 of file qgsalignraster.h.

◆ progressHandler()

ProgressHandler* QgsAlignRaster::progressHandler ( ) const

inline

Gets associated progress handler. May be nullptr (default)

Definition at line 173 of file qgsalignraster.h.

◆ rasters()

List QgsAlignRaster::rasters ( ) const

inline

Gets list of rasters that will be aligned.

Definition at line 178 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 356 of file qgsalignraster.cpp.

◆ setCellSize() [1/2]

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

inline

Sets output cell size.

Definition at line 184 of file qgsalignraster.h.

◆ setCellSize() [2/2]

void QgsAlignRaster::setCellSize ( QSizeF size )

inline

Sets output cell size.

Definition at line 186 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 131 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 139 of file qgsalignraster.cpp.

◆ setDestinationCrs()

void QgsAlignRaster::setDestinationCrs ( const QString & crsWkt )

inline

Sets the output CRS in WKT format.

Definition at line 191 of file qgsalignraster.h.

◆ setGridOffset()

void QgsAlignRaster::setGridOffset ( QPointF offset )

inline

Definition at line 180 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 157 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 152 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 171 of file qgsalignraster.h.

◆ setRasters()

void QgsAlignRaster::setRasters ( const List & list )

inline

Sets list of rasters that will be aligned.

Definition at line 176 of file qgsalignraster.h.

◆ suggestedReferenceLayer()

int QgsAlignRaster::suggestedReferenceLayer ( ) const

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

Definition at line 389 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 512 of file qgsalignraster.cpp.

Member Data Documentation

◆ mCellSizeX

double QgsAlignRaster::mCellSizeX

protected

Destination cell size.

Definition at line 292 of file qgsalignraster.h.

◆ mCellSizeY

double QgsAlignRaster::mCellSizeY

protected

Definition at line 292 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 300 of file qgsalignraster.h.

◆ mCrsWkt

QString QgsAlignRaster::mCrsWkt

protected

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

Definition at line 290 of file qgsalignraster.h.

◆ mErrorMessage

QString QgsAlignRaster::mErrorMessage

protected

Last error message from run()

Definition at line 284 of file qgsalignraster.h.

◆ mGeoTransform

double QgsAlignRaster::mGeoTransform[6]

protected

Computed geo-transform.

Definition at line 305 of file qgsalignraster.h.

◆ mGridOffsetX

double QgsAlignRaster::mGridOffsetX

protected

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

Definition at line 294 of file qgsalignraster.h.

◆ mGridOffsetY

double QgsAlignRaster::mGridOffsetY

protected

Definition at line 294 of file qgsalignraster.h.

◆ mProgressHandler

ProgressHandler* QgsAlignRaster::mProgressHandler = nullptr

protected

Object that facilitates reporting of progress / cancellation.

Definition at line 281 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 287 of file qgsalignraster.h.

◆ mXSize

int QgsAlignRaster::mXSize

protected

Computed raster grid width.

Definition at line 307 of file qgsalignraster.h.

◆ mYSize

int QgsAlignRaster::mYSize

protected

Computed raster grid height.

Definition at line 310 of file qgsalignraster.h.

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

/build/qgis-3.10.0+15buster/src/analysis/raster/qgsalignraster.h
/build/qgis-3.10.0+15buster/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