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GDALPamRasterBand Class Reference

PAM raster band. More...

`#include <gdal_pam.h>`

Inheritance diagram for GDALPamRasterBand:

## Public Member Functions
void | SetDescription (const char *) override
| Set object description. More...
CPLErr | SetNoDataValue (double) override
| Set the no data value for this band. More...
double | GetNoDataValue (int *pbSuccess=nullptr) override
| Fetch the no data value for this band. More...
CPLErr | DeleteNoDataValue () override
| Remove the no data value for this band. More...
CPLErr | SetColorTable (GDALColorTable *) override
| Set the raster color table. More...
GDALColorTable * | GetColorTable () override
| Fetch the color table associated with band. More...
CPLErr | SetColorInterpretation (GDALColorInterp) override
| Set color interpretation of a band. More...
GDALColorInterp | GetColorInterpretation () override
| How should this band be interpreted as color? More...
const char * | GetUnitType () override
| Return raster unit type. More...
CPLErr | SetUnitType (const char *) override
| Set unit type. More...
char ** | GetCategoryNames () override
| Fetch the list of category names for this raster. More...
CPLErr | SetCategoryNames (char **) override
| Set the category names for this band. More...
double | GetOffset (int *pbSuccess=nullptr) override
| Fetch the raster value offset. More...
CPLErr | SetOffset (double) override
| Set scaling offset. More...
double | GetScale (int *pbSuccess=nullptr) override
| Fetch the raster value scale. More...
CPLErr | SetScale (double) override
| Set scaling ratio. More...
CPLErr | GetHistogram (double dfMin, double dfMax, int nBuckets, GUIntBig *panHistogram, int bIncludeOutOfRange, int bApproxOK, GDALProgressFunc, void *pProgressData) override
| Compute raster histogram. More...
CPLErr | GetDefaultHistogram (double *pdfMin, double *pdfMax, int *pnBuckets, GUIntBig **ppanHistogram, int bForce, GDALProgressFunc, void *pProgressData) override
| Fetch default raster histogram. More...
CPLErr | SetDefaultHistogram (double dfMin, double dfMax, int nBuckets, GUIntBig *panHistogram) override
| Set default histogram. More...
CPLErr | SetMetadata (char **papszMetadata, const char *pszDomain="") override
| Set metadata. More...
CPLErr | SetMetadataItem (const char *pszName, const char *pszValue, const char *pszDomain="") override
| Set single metadata item. More...
GDALRasterAttributeTable * | GetDefaultRAT () override
| Fetch default Raster Attribute Table. More...
CPLErr | SetDefaultRAT (const GDALRasterAttributeTable *) override
| Set default Raster Attribute Table. More...
Public Member Functions inherited from GDALRasterBand
| GDALRasterBand ()
| GDALRasterBand (int bForceCachedIO)
| Constructor. More...
| ~GDALRasterBand () override
int | GetXSize ()
| Fetch XSize of raster. More...
int | GetYSize ()
| Fetch YSize of raster. More...
int | GetBand ()
| Fetch the band number. More...
GDALDataset * | GetDataset ()
| Fetch the owning dataset handle. More...
GDALDataType | GetRasterDataType (void)
| Fetch the pixel data type for this band. More...
void | GetBlockSize (int *, int *)
| Fetch the "natural" block size of this band. More...
CPLErr | GetActualBlockSize (int, int, int *, int *)
| Fetch the actual block size for a given block offset. More...
GDALAccess | GetAccess ()
| Find out if we have update permission for this band. More...
CPLErr | RasterIO (GDALRWFlag, int, int, int, int, void *, int, int, GDALDataType, GSpacing, GSpacing, GDALRasterIOExtraArg *psExtraArg) CPL_WARN_UNUSED_RESULT
| Read/write a region of image data for this band. More...
CPLErr | ReadBlock (int, int, void *) CPL_WARN_UNUSED_RESULT
| Read a block of image data efficiently. More...
CPLErr | WriteBlock (int, int, void *) CPL_WARN_UNUSED_RESULT
| Write a block of image data efficiently. More...
GDALRasterBlock * | GetLockedBlockRef (int nXBlockOff, int nYBlockOff, int bJustInitialize=FALSE) CPL_WARN_UNUSED_RESULT
| Fetch a pointer to an internally cached raster block. More...
CPLErr | FlushBlock (int, int, int bWriteDirtyBlock=TRUE)
| Flush a block out of the block cache. More...
unsigned char * | GetIndexColorTranslationTo (GDALRasterBand *poReferenceBand, unsigned char *pTranslationTable=nullptr, int *pApproximateMatching=nullptr)
| Compute translation table for color tables. More...
virtual CPLErr | FlushCache ()
| Flush raster data cache. More...
virtual double | GetMinimum (int *pbSuccess=nullptr)
| Fetch the minimum value for this band. More...
virtual double | GetMaximum (int *pbSuccess=nullptr)
| Fetch the maximum value for this band. More...
virtual CPLErr | Fill (double dfRealValue, double dfImaginaryValue=0)
| Fill this band with a constant value. More...
virtual CPLErr | GetStatistics (int bApproxOK, int bForce, double *pdfMin, double *pdfMax, double *pdfMean, double *padfStdDev)
| Fetch image statistics. More...
virtual CPLErr | ComputeStatistics (int bApproxOK, double *pdfMin, double *pdfMax, double *pdfMean, double *pdfStdDev, GDALProgressFunc, void *pProgressData)
| Compute image statistics. More...
virtual CPLErr | SetStatistics (double dfMin, double dfMax, double dfMean, double dfStdDev)
| Set statistics on band. More...
virtual CPLErr | ComputeRasterMinMax (int, double *)
| Compute the min/max values for a band. More...
char ** | GetMetadata (const char *pszDomain="") override
| Fetch metadata. More...
CPLErr | SetMetadata (char **papszMetadata, const char *pszDomain) override
| Set metadata. More...
const char * | GetMetadataItem (const char *pszName, const char *pszDomain) override
| Fetch single metadata item. More...
CPLErr | SetMetadataItem (const char *pszName, const char *pszValue, const char *pszDomain) override
| Set single metadata item. More...
virtual int | HasArbitraryOverviews ()
| Check for arbitrary overviews. More...
virtual int | GetOverviewCount ()
| Return the number of overview layers available. More...
virtual GDALRasterBand * | GetOverview (int)
| Fetch overview raster band object. More...
virtual GDALRasterBand * | GetRasterSampleOverview (GUIntBig)
| Fetch best sampling overview. More...
virtual CPLErr | BuildOverviews (const char *pszResampling, int nOverviews, int *panOverviewList, GDALProgressFunc pfnProgress, void *pProgressData)
| Build raster overview(s) More...
virtual CPLErr | AdviseRead (int nXOff, int nYOff, int nXSize, int nYSize, int nBufXSize, int nBufYSize, GDALDataType eBufType, char **papszOptions)
| Advise driver of upcoming read requests. More...
virtual GDALRasterBand * | GetMaskBand ()
| Return the mask band associated with the band. More...
virtual int | GetMaskFlags ()
| Return the status flags of the mask band associated with the band. More...
virtual CPLErr | CreateMaskBand (int nFlagsIn)
| Adds a mask band to the current band. More...
virtual CPLVirtualMem * | GetVirtualMemAuto (GDALRWFlag eRWFlag, int *pnPixelSpace, GIntBig *pnLineSpace, char **papszOptions) CPL_WARN_UNUSED_RESULT
| Create a CPLVirtualMem object from a GDAL raster band object. More...
int | GetDataCoverageStatus (int nXOff, int nYOff, int nXSize, int nYSize, int nMaskFlagStop=0, double *pdfDataPct=nullptr)
| Get the coverage status of a sub-window of the raster. More...
std::shared_ptr< GDALMDArray > | AsMDArray () const
| Return a view of this raster band as a 2D multidimensional GDALMDArray. More...
void | ReportError (CPLErr eErrClass, CPLErrorNum err_no, const char *fmt,...) CPL_PRINT_FUNC_FORMAT(4
| Emits an error related to a raster band. More...
Public Member Functions inherited from GDALMajorObject
int | GetMOFlags () const
| Returns the GMO_ flags. More...
void | SetMOFlags (int nFlagsIn)
| Assign GMO_flags. More...
virtual const char * | GetDescription () const
| Fetch object description. More...
virtual char ** | GetMetadataDomainList ()
| Fetch list of metadata domains. More...

## Friends
class | GDALPamDataset

## Additional Inherited Members
Static Public Member Functions inherited from GDALRasterBand
void static GDALRasterBandH | ToHandle (GDALRasterBand *poBand)
| Convert a GDALRasterBand* to a GDALRasterBandH. More...
static GDALRasterBand * | FromHandle (GDALRasterBandH hBand)
| Convert a GDALRasterBandH to a GDALRasterBand*. More...
Static Public Member Functions inherited from GDALMajorObject
static GDALMajorObjectH | ToHandle (GDALMajorObject *poMajorObject)
| Convert a GDALMajorObject* to a GDALMajorObjectH. More...
static GDALMajorObject * | FromHandle (GDALMajorObjectH hMajorObject)
| Convert a GDALMajorObjectH to a GDALMajorObject*. More...
Protected Member Functions inherited from GDALRasterBand
virtual CPLErr | IReadBlock (int nBlockXOff, int nBlockYOff, void *pData)=0
| Read a block of data. More...
virtual CPLErr | IWriteBlock (int nBlockXOff, int nBlockYOff, void *pData)
| Write a block of data. More...
virtual CPLErr | IRasterIO (GDALRWFlag, int, int, int, int, void *, int, int, GDALDataType, GSpacing, GSpacing, GDALRasterIOExtraArg *psExtraArg) CPL_WARN_UNUSED_RESULT
| Read/write a region of image data for this band. More...
virtual int | IGetDataCoverageStatus (int nXOff, int nYOff, int nXSize, int nYSize, int nMaskFlagStop, double *pdfDataPct)
| Get the coverage status of a sub-window of the raster. More...
GDALRasterBlock * | TryGetLockedBlockRef (int nXBlockOff, int nYBlockYOff)
| Try fetching block ref. More...
Protected Member Functions inherited from GDALMajorObject
char ** | BuildMetadataDomainList (char **papszList, int bCheckNonEmpty,...) CPL_NULL_TERMINATED
| Helper function for custom implementations of GetMetadataDomainList() More...

## Detailed Description

PAM raster band.

## Member Function Documentation

CPLErr GDALPamRasterBand::DeleteNoDataValue | ( |  | ) |
| override virtual

Remove the no data value for this band.

This method is the same as the C function GDALDeleteRasterNoDataValue().

Returns
  CE_None on success, or CE_Failure on failure. If unsupported by the driver, CE_Failure is returned by no error message will have been emitted.

Since
  GDAL 2.1

Reimplemented from GDALRasterBand.

char ** GDALPamRasterBand::GetCategoryNames | ( |  | ) |
| override virtual

Fetch the list of category names for this raster.

The return list is a "StringList" in the sense of the CPL functions. That is a NULL terminated array of strings. Raster values without associated names will have an empty string in the returned list. The first entry in the list is for raster values of zero, and so on.

The returned stringlist should not be altered or freed by the application. It may change on the next GDAL call, so please copy it if it is needed for any period of time.

This method is the same as the C function GDALGetRasterCategoryNames().

Returns
  list of names, or NULL if none.

Reimplemented from GDALRasterBand.

GDALColorInterp GDALPamRasterBand::GetColorInterpretation | ( |  | ) |
| override virtual

How should this band be interpreted as color?

GCI_Undefined is returned when the format doesn't know anything about the color interpretation.

This method is the same as the C function GDALGetRasterColorInterpretation().

Returns
  color interpretation value for band.

Reimplemented from GDALRasterBand.

GDALColorTable * GDALPamRasterBand::GetColorTable | ( |  | ) |
| override virtual

Fetch the color table associated with band.

If there is no associated color table, the return result is NULL. The returned color table remains owned by the GDALRasterBand, and can't be depended on for long, nor should it ever be modified by the caller.

This method is the same as the C function GDALGetRasterColorTable().

Returns
  internal color table, or NULL.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::GetDefaultHistogram | ( | double * | pdfMin,
|  | double * | pdfMax,
|  | int * | pnBuckets,
|  | GUIntBig ** | ppanHistogram,
|  | int | bForce,
|  | GDALProgressFunc | pfnProgress,
|  | void * | pProgressData
| ) |  |
| override virtual

Fetch default raster histogram.

The default method in GDALRasterBand will compute a default histogram. This method is overridden by derived classes (such as GDALPamRasterBand, VRTDataset, HFADataset...) that may be able to fetch efficiently an already stored histogram.

This method is the same as the C functions GDALGetDefaultHistogram() and GDALGetDefaultHistogramEx().

Parameters

  pdfMin | pointer to double value that will contain the lower bound of the histogram.
  pdfMax | pointer to double value that will contain the upper bound of the histogram.
  pnBuckets | pointer to int value that will contain the number of buckets in *ppanHistogram.
  ppanHistogram | pointer to array into which the histogram totals are placed. To be freed with VSIFree
  bForce | TRUE to force the computation. If FALSE and no default histogram is available, the method will return CE_Warning
  pfnProgress | function to report progress to completion.
  pProgressData | application data to pass to pfnProgress.

Returns
  CE_None on success, CE_Failure if something goes wrong, or CE_Warning if no default histogram is available.

Reimplemented from GDALRasterBand.

GDALRasterAttributeTable * GDALPamRasterBand::GetDefaultRAT | ( |  | ) |
| override virtual

Fetch default Raster Attribute Table.

A RAT will be returned if there is a default one associated with the band, otherwise NULL is returned. The returned RAT is owned by the band and should not be deleted by the application.

This method is the same as the C function GDALGetDefaultRAT().

Returns
  NULL, or a pointer to an internal RAT owned by the band.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::GetHistogram | ( | double | dfMin,
|  | double | dfMax,
|  | int | nBuckets,
|  | GUIntBig * | panHistogram,
|  | int | bIncludeOutOfRange,
|  | int | bApproxOK,
|  | GDALProgressFunc | pfnProgress,
|  | void * | pProgressData
| ) |  |
| override virtual

Compute raster histogram.

Note that the bucket size is (dfMax-dfMin) / nBuckets.

For example to compute a simple 256 entry histogram of eight bit data, the following would be suitable. The unusual bounds are to ensure that bucket boundaries don't fall right on integer values causing possible errors due to rounding after scaling.

GUIntBig anHistogram[256];
poBand->GetHistogram( -0.5, 255.5, 256, anHistogram, FALSE, FALSE,
GDALDummyProgress, nullptr );

Note that setting bApproxOK will generally result in a subsampling of the file, and will utilize overviews if available. It should generally produce a representative histogram for the data that is suitable for use in generating histogram based luts for instance. Generally bApproxOK is much faster than an exactly computed histogram.

This method is the same as the C functions GDALGetRasterHistogram() and GDALGetRasterHistogramEx().

Parameters

  dfMin | the lower bound of the histogram.
  dfMax | the upper bound of the histogram.
  nBuckets | the number of buckets in panHistogram.
  panHistogram | array into which the histogram totals are placed.
  bIncludeOutOfRange | if TRUE values below the histogram range will mapped into panHistogram[0], and values above will be mapped into panHistogram[nBuckets-1] otherwise out of range values are discarded.
  bApproxOK | TRUE if an approximate, or incomplete histogram OK.
  pfnProgress | function to report progress to completion.
  pProgressData | application data to pass to pfnProgress.

Returns
  CE_None on success, or CE_Failure if something goes wrong.

Reimplemented from GDALRasterBand.

double GDALPamRasterBand::GetNoDataValue | ( | int * | pbSuccess = `nullptr` | ) |
| override virtual

Fetch the no data value for this band.

If there is no out of data value, an out of range value will generally be returned. The no data value for a band is generally a special marker value used to mark pixels that are not valid data. Such pixels should generally not be displayed, nor contribute to analysis operations.

The no data value returned is 'raw', meaning that it has no offset and scale applied.

This method is the same as the C function GDALGetRasterNoDataValue().

Parameters

  pbSuccess | pointer to a boolean to use to indicate if a value is actually associated with this layer. May be NULL (default).

Returns
  the nodata value for this band.

Reimplemented from GDALRasterBand.

double GDALPamRasterBand::GetOffset | ( | int * | pbSuccess = `nullptr` | ) |
| override virtual

Fetch the raster value offset.

This value (in combination with the GetScale() value) can be used to transform raw pixel values into the units returned by GetUnitType(). For example this might be used to store elevations in GUInt16 bands with a precision of 0.1, and starting from -100.

Units value = (raw value * scale) + offset

Note that applying scale and offset is of the responsibility of the user, and is not done by methods such as RasterIO() or ReadBlock().

For file formats that don't know this intrinsically a value of zero is returned.

This method is the same as the C function GDALGetRasterOffset().

Parameters

  pbSuccess | pointer to a boolean to use to indicate if the returned value is meaningful or not. May be NULL (default).

Returns
  the raster offset.

Reimplemented from GDALRasterBand.

double GDALPamRasterBand::GetScale | ( | int * | pbSuccess = `nullptr` | ) |
| override virtual

Fetch the raster value scale.

This value (in combination with the GetOffset() value) can be used to transform raw pixel values into the units returned by GetUnitType(). For example this might be used to store elevations in GUInt16 bands with a precision of 0.1, and starting from -100.

Units value = (raw value * scale) + offset

Note that applying scale and offset is of the responsibility of the user, and is not done by methods such as RasterIO() or ReadBlock().

For file formats that don't know this intrinsically a value of one is returned.

This method is the same as the C function GDALGetRasterScale().

Parameters

  pbSuccess | pointer to a boolean to use to indicate if the returned value is meaningful or not. May be NULL (default).

Returns
  the raster scale.

Reimplemented from GDALRasterBand.

const char * GDALPamRasterBand::GetUnitType | ( |  | ) |
| override virtual

Return raster unit type.

Return a name for the units of this raster's values. For instance, it might be "m" for an elevation model in meters, or "ft" for feet. If no units are available, a value of "" will be returned. The returned string should not be modified, nor freed by the calling application.

This method is the same as the C function GDALGetRasterUnitType().

Returns
  unit name string.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetCategoryNames | ( | char ** | papszNames | ) |
| override virtual

Set the category names for this band.

See the GetCategoryNames() method for more on the interpretation of category names.

This method is the same as the C function GDALSetRasterCategoryNames().

Parameters

  papszNames | the NULL terminated StringList of category names. May be NULL to just clear the existing list.

Returns
  CE_None on success of CE_Failure on failure. If unsupported by the driver CE_Failure is returned, but no error message is reported.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetColorInterpretation | ( | GDALColorInterp | eColorInterp | ) |
| override virtual

Set color interpretation of a band.

This method is the same as the C function GDALSetRasterColorInterpretation().

Parameters

  eColorInterp | the new color interpretation to apply to this band.

Returns
  CE_None on success or CE_Failure if method is unsupported by format.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetColorTable | ( | GDALColorTable * | poCT | ) |
| override virtual

Set the raster color table.

The driver will make a copy of all desired data in the colortable. It remains owned by the caller after the call.

This method is the same as the C function GDALSetRasterColorTable().

Parameters

  poCT | the color table to apply. This may be NULL to clear the color table (where supported).

Returns
  CE_None on success, or CE_Failure on failure. If the action is unsupported by the driver, a value of CE_Failure is returned, but no error is issued.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetDefaultHistogram | ( | double | dfMin,
|  | double | dfMax,
|  | int | nBuckets,
|  | GUIntBig * | panHistogram
| ) |  |
| override virtual

Set default histogram.

This method is the same as the C function GDALSetDefaultHistogram() and GDALSetDefaultHistogramEx()

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetDefaultRAT | ( | const GDALRasterAttributeTable * | poRAT | ) |
| override virtual

Set default Raster Attribute Table.

Associates a default RAT with the band. If not implemented for the format a CPLE_NotSupported error will be issued. If successful a copy of the RAT is made, the original remains owned by the caller.

This method is the same as the C function GDALSetDefaultRAT().

Parameters

  poRAT | the RAT to assign to the band.

Returns
  CE_None on success or CE_Failure if unsupported or otherwise failing.

Reimplemented from GDALRasterBand.

void GDALPamRasterBand::SetDescription | ( | const char * | pszNewDesc | ) |
| override virtual

Set object description.

The semantics of the description are specific to the derived type. For GDALDatasets it is the dataset name. For GDALRasterBands it is actually a description (if supported) or "".

Normally application code should not set the "description" for GDALDatasets. It is handled internally.

This method is the same as the C function GDALSetDescription().

Reimplemented from GDALMajorObject.

CPLErr GDALPamRasterBand::SetMetadata | ( | char ** | papszMetadataIn,
|  | const char * | pszDomain = `""`
| ) |  |
| override virtual

Set metadata.

The C function GDALSetMetadata() does the same thing as this method.

Parameters

  papszMetadataIn | the metadata in name=value string list format to apply.
  pszDomain | the domain of interest. Use "" or NULL for the default domain.

Returns
  CE_None on success, CE_Failure on failure and CE_Warning if the metadata has been accepted, but is likely not maintained persistently by the underlying object between sessions.

Reimplemented from GDALMajorObject.

CPLErr GDALPamRasterBand::SetMetadataItem | ( | const char * | pszName,
|  | const char * | pszValue,
|  | const char * | pszDomain = `""`
| ) |  |
| override virtual

Set single metadata item.

The C function GDALSetMetadataItem() does the same thing as this method.

Parameters

  pszName | the key for the metadata item to fetch.
  pszValue | the value to assign to the key.
  pszDomain | the domain to set within, use NULL for the default domain.

Returns
  CE_None on success, or an error code on failure.

Reimplemented from GDALMajorObject.

CPLErr GDALPamRasterBand::SetNoDataValue | ( | double | dfNoData | ) |
| override virtual

Set the no data value for this band.

Depending on drivers, changing the no data value may or may not have an effect on the pixel values of a raster that has just been created. It is thus advised to explicitly called Fill() if the intent is to initialize the raster to the nodata value. In ay case, changing an existing no data value, when one already exists and the dataset exists or has been initialized, has no effect on the pixel whose value matched the previous nodata value.

To clear the nodata value, use DeleteNoDataValue().

This method is the same as the C function GDALSetRasterNoDataValue().

Parameters

  dfNoData | the value to set.

Returns
  CE_None on success, or CE_Failure on failure. If unsupported by the driver, CE_Failure is returned by no error message will have been emitted.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetOffset | ( | double | dfNewOffset | ) |
| override virtual

Set scaling offset.

Very few formats implement this method. When not implemented it will issue a CPLE_NotSupported error and return CE_Failure.

This method is the same as the C function GDALSetRasterOffset().

Parameters

  dfNewOffset | the new offset.

Returns
  CE_None or success or CE_Failure on failure.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetScale | ( | double | dfNewScale | ) |
| override virtual

Set scaling ratio.

Very few formats implement this method. When not implemented it will issue a CPLE_NotSupported error and return CE_Failure.

This method is the same as the C function GDALSetRasterScale().

Parameters

  dfNewScale | the new scale.

Returns
  CE_None or success or CE_Failure on failure.

Reimplemented from GDALRasterBand.

CPLErr GDALPamRasterBand::SetUnitType | ( | const char * | pszNewValue | ) |
| override virtual

Set unit type.

Set the unit type for a raster band. Values should be one of "" (the default indicating it is unknown), "m" indicating meters, or "ft" indicating feet, though other nonstandard values are allowed.

This method is the same as the C function GDALSetRasterUnitType().

Parameters

  pszNewValue | the new unit type value.

Returns
  CE_None on success or CE_Failure if not successful, or unsupported.

Reimplemented from GDALRasterBand.

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

- gdal_pam.h
- gdalpamrasterband.cpp