C++ GDALRasterBand::SetMetadataItem方法代码示例

// static function- pointer set in driver
GDALDataset *KEADataset::Create( const char * pszFilename,
                                  int nXSize, int nYSize, int nBands,
                                  GDALDataType eType,
                                  char ** papszParmList  )
{
    H5::H5File *keaImgH5File = CreateLL( pszFilename, nXSize, nYSize, nBands,
                                         eType, papszParmList  );
    if( keaImgH5File == NULL )
        return NULL;

    bool bThematic =
        CPLTestBool(CSLFetchNameValueDef( papszParmList, "THEMATIC", "FALSE" ));

    try
    {
        // create our dataset object
        KEADataset *pDataset = new KEADataset( keaImgH5File, GA_Update );

        pDataset->SetDescription( pszFilename );

        // set all to thematic if asked
        if( bThematic )
        {
            for( int nCount = 0; nCount < nBands; nCount++ )
            {
                GDALRasterBand *pBand = pDataset->GetRasterBand(nCount+1);
                pBand->SetMetadataItem("LAYER_TYPE", "thematic");
            }
        }

        return pDataset;
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError( CE_Failure, CPLE_OpenFailed,
                  "Attempt to create file `%s' failed. Error: %s\n",
                  pszFilename, e.what() );
        return NULL;
    }
}

GDALDataset *KEADataset::CreateCopy( const char * pszFilename, GDALDataset *pSrcDs,
                                CPL_UNUSED int bStrict, char **  papszParmList, 
                                GDALProgressFunc pfnProgress, void *pProgressData )
{
    // get the data out of the input dataset
    int nXSize = pSrcDs->GetRasterXSize();
    int nYSize = pSrcDs->GetRasterYSize();
    int nBands = pSrcDs->GetRasterCount();

    GDALDataType eType = (nBands == 0) ? GDT_Unknown : pSrcDs->GetRasterBand(1)->GetRasterDataType();
    H5::H5File *keaImgH5File = CreateLL( pszFilename, nXSize, nYSize, nBands,
                                         eType, papszParmList  );
    if( keaImgH5File == NULL )
        return NULL;

    bool bThematic = CSLTestBoolean(CSLFetchNameValueDef( papszParmList, "THEMATIC", "FALSE" ));

    try
    {
        // create the imageio
        kealib::KEAImageIO *pImageIO = new kealib::KEAImageIO();
        
        // open the file
        pImageIO->openKEAImageHeader( keaImgH5File );

        // copy file
        if( !KEACopyFile( pSrcDs, pImageIO, pfnProgress, pProgressData) )
        {
            delete pImageIO;
            return NULL;
        }

        // close it
        try
        {
            pImageIO->close();
        }
        catch (kealib::KEAIOException &e)
        {
        }
        delete pImageIO;

        // now open it again - because the constructor loads all the info
        // in we need to copy the data first....
        keaImgH5File = kealib::KEAImageIO::openKeaH5RW( pszFilename );

        // and wrap it in a dataset
        KEADataset *pDataset = new KEADataset( keaImgH5File, GA_Update );
        pDataset->SetDescription( pszFilename );

        // set all to thematic if asked - overrides whatever set by CopyFile
        if( bThematic )
        {
            for( int nCount = 0; nCount < nBands; nCount++ )
            {
                GDALRasterBand *pBand = pDataset->GetRasterBand(nCount+1);
                pBand->SetMetadataItem("LAYER_TYPE", "thematic");
            }
        }

        for( int nCount = 0; nCount < nBands; nCount++ )
        {
            pDataset->GetRasterBand(nCount+1)->SetColorInterpretation(
                pSrcDs->GetRasterBand(nCount+1)->GetColorInterpretation());
        }
        
        // KEA has no concept of per-dataset mask band for now.
        for( int nCount = 0; nCount < nBands; nCount++ )
        {
            if( pSrcDs->GetRasterBand(nCount+1)->GetMaskFlags() == 0 ) // Per-band mask
            {
                pDataset->GetRasterBand(nCount+1)->CreateMaskBand(0);
                GDALRasterBandCopyWholeRaster(
                    (GDALRasterBandH)pSrcDs->GetRasterBand(nCount+1)->GetMaskBand(),
                    (GDALRasterBandH)pDataset->GetRasterBand(nCount+1)->GetMaskBand(),
                    NULL, NULL, NULL);
            }
        }

        return pDataset;
    }
    catch (kealib::KEAException &e)
    {
        CPLError( CE_Failure, CPLE_OpenFailed,
                  "Attempt to create file `%s' failed. Error: %s\n",
                  pszFilename, e.what() );
        return NULL;
    }

}

GDALDataset *LCPDataset::Open( GDALOpenInfo * poOpenInfo )

{
    /* -------------------------------------------------------------------- */
    /*      Verify that this is a FARSITE LCP file    */
    /* -------------------------------------------------------------------- */
    if( !Identify( poOpenInfo ) )
        return NULL;

    /* -------------------------------------------------------------------- */
    /*      Confirm the requested access is supported.                      */
    /* -------------------------------------------------------------------- */
    if( poOpenInfo->eAccess == GA_Update )
    {
        CPLError( CE_Failure, CPLE_NotSupported,
                  "The LCP driver does not support update access to existing"
                  " datasets.\n" );
        return NULL;
    }

    /* -------------------------------------------------------------------- */
    /*      Create a corresponding GDALDataset.                             */
    /* -------------------------------------------------------------------- */
    LCPDataset  *poDS;
    VSILFILE        *fpImage;

    fpImage = VSIFOpenL(poOpenInfo->pszFilename, "rb");
    if (fpImage == NULL)
        return NULL;

    poDS = new LCPDataset();
    poDS->fpImage = fpImage;

    /* -------------------------------------------------------------------- */
    /*      Read the header and extract some information.                   */
    /* -------------------------------------------------------------------- */
    int bHaveCrownFuels, bHaveGroundFuels;
    int nBands, i;
    long nWidth = -1, nHeight = -1;
    int nTemp, nTemp2;
    char szTemp[32];
    char* pszList;

    VSIFSeekL( poDS->fpImage, 0, SEEK_SET );
    if (VSIFReadL( poDS->pachHeader, 1, LCP_HEADER_SIZE, poDS->fpImage ) != LCP_HEADER_SIZE)
    {
        CPLError(CE_Failure, CPLE_FileIO, "File too short");
        delete poDS;
        return NULL;
    }

    nWidth = CPL_LSBINT32PTR (poDS->pachHeader + 4164);
    nHeight = CPL_LSBINT32PTR (poDS->pachHeader + 4168);

    poDS->nRasterXSize = nWidth;
    poDS->nRasterYSize = nHeight;

    if (!GDALCheckDatasetDimensions(poDS->nRasterXSize, poDS->nRasterYSize))
    {
        delete poDS;
        return NULL;
    }

    // crown fuels = canopy height, canopy base height, canopy bulk density
    // 21 = have them, 20 = don't have them
    bHaveCrownFuels = ( CPL_LSBINT32PTR (poDS->pachHeader + 0) - 20 );
    // ground fuels = duff loading, coarse woody
    bHaveGroundFuels = ( CPL_LSBINT32PTR (poDS->pachHeader + 4) - 20 );

    if( bHaveCrownFuels )
    {
        if( bHaveGroundFuels )
            nBands = 10;
        else
            nBands = 8;
    }
    else
    {
        if( bHaveGroundFuels )
            nBands = 7;
        else
            nBands = 5;
    }

    // add dataset-level metadata

    nTemp = CPL_LSBINT32PTR (poDS->pachHeader + 8);
    sprintf(szTemp, "%d", nTemp);
    poDS->SetMetadataItem( "LATITUDE", szTemp );

    nTemp = CPL_LSBINT32PTR (poDS->pachHeader + 4204);
    if ( nTemp == 0 )
        poDS->SetMetadataItem( "LINEAR_UNIT", "Meters" );
    if ( nTemp == 1 )
        poDS->SetMetadataItem( "LINEAR_UNIT", "Feet" );

    poDS->pachHeader[LCP_HEADER_SIZE-1] = '\0';
    poDS->SetMetadataItem( "DESCRIPTION", poDS->pachHeader + 6804 );


//.........这里部分代码省略.........