GDALDatasetH CPL_STDCALL GDALCreateWarpedVRT( GDALDatasetH hSrcDS, int nPixels, int nLines, double *padfGeoTransform, GDALWarpOptions *psOptions ) { VALIDATE_POINTER1( hSrcDS, "GDALCreateWarpedVRT", NULL ); /* -------------------------------------------------------------------- */ /* Create the VRTDataset and populate it with bands. */ /* -------------------------------------------------------------------- */ VRTWarpedDataset *poDS = new VRTWarpedDataset( nPixels, nLines ); int i; psOptions->hDstDS = (GDALDatasetH) poDS; poDS->SetGeoTransform( padfGeoTransform ); for( i = 0; i < psOptions->nBandCount; i++ ) { VRTWarpedRasterBand *poBand; GDALRasterBand *poSrcBand = (GDALRasterBand *) GDALGetRasterBand( hSrcDS, i+1 ); poDS->AddBand( poSrcBand->GetRasterDataType(), NULL ); poBand = (VRTWarpedRasterBand *) poDS->GetRasterBand( i+1 ); poBand->CopyCommonInfoFrom( poSrcBand ); } /* -------------------------------------------------------------------- */ /* Initialize the warp on the VRTWarpedDataset. */ /* -------------------------------------------------------------------- */ poDS->Initialize( psOptions ); return (GDALDatasetH) poDS; }
CPLErr VRTWarpedRasterBand::IReadBlock( int nBlockXOff, int nBlockYOff, void * pImage ) { CPLErr eErr; VRTWarpedDataset *poWDS = (VRTWarpedDataset *) poDS; GDALRasterBlock *poBlock; poBlock = GetLockedBlockRef( nBlockXOff, nBlockYOff, TRUE ); eErr = poWDS->ProcessBlock( nBlockXOff, nBlockYOff ); if( eErr == CE_None && pImage != poBlock->GetDataRef() ) { int nDataBytes; nDataBytes = (GDALGetDataTypeSize(poBlock->GetDataType()) / 8) * poBlock->GetXSize() * poBlock->GetYSize(); memcpy( pImage, poBlock->GetDataRef(), nDataBytes ); } poBlock->DropLock(); return eErr; }
CPLErr VRTWarpedDataset::IBuildOverviews( const char *pszResampling, int nOverviews, int *panOverviewList, int nListBands, int *panBandList, GDALProgressFunc pfnProgress, void * pProgressData ) { /* -------------------------------------------------------------------- */ /* Initial progress result. */ /* -------------------------------------------------------------------- */ if( !pfnProgress( 0.0, NULL, pProgressData ) ) { CPLError( CE_Failure, CPLE_UserInterrupt, "User terminated" ); return CE_Failure; } /* -------------------------------------------------------------------- */ /* Establish which of the overview levels we already have, and */ /* which are new. */ /* -------------------------------------------------------------------- */ int i, nNewOverviews, *panNewOverviewList = NULL; nNewOverviews = 0; panNewOverviewList = (int *) CPLCalloc(sizeof(int),nOverviews); for( i = 0; i < nOverviews; i++ ) { int j; for( j = 0; j < nOverviewCount; j++ ) { int nOvFactor; VRTWarpedDataset *poOverview = papoOverviews[j]; nOvFactor = (int) (0.5+GetRasterXSize() / (double) poOverview->GetRasterXSize()); if( nOvFactor == panOverviewList[i] || nOvFactor == GDALOvLevelAdjust( panOverviewList[i], GetRasterXSize() ) ) panOverviewList[i] *= -1; } if( panOverviewList[i] > 0 ) panNewOverviewList[nNewOverviews++] = panOverviewList[i]; } /* -------------------------------------------------------------------- */ /* Create each missing overview (we don't need to do anything */ /* to update existing overviews). */ /* -------------------------------------------------------------------- */ for( i = 0; i < nNewOverviews; i++ ) { int nOXSize, nOYSize, iBand; VWOTInfo *psInfo; VRTWarpedDataset *poOverviewDS; /* -------------------------------------------------------------------- */ /* What size should this overview be. */ /* -------------------------------------------------------------------- */ nOXSize = (GetRasterXSize() + panNewOverviewList[i] - 1) / panNewOverviewList[i]; nOYSize = (GetRasterYSize() + panNewOverviewList[i] - 1) / panNewOverviewList[i]; /* -------------------------------------------------------------------- */ /* Create the overview dataset. */ /* -------------------------------------------------------------------- */ poOverviewDS = new VRTWarpedDataset( nOXSize, nOYSize ); for( iBand = 0; iBand < GetRasterCount(); iBand++ ) { GDALRasterBand *poOldBand = GetRasterBand(iBand+1); VRTWarpedRasterBand *poNewBand = new VRTWarpedRasterBand( poOverviewDS, iBand+1, poOldBand->GetRasterDataType() ); poNewBand->CopyCommonInfoFrom( poOldBand ); poOverviewDS->SetBand( iBand+1, poNewBand ); } nOverviewCount++; papoOverviews = (VRTWarpedDataset **) CPLRealloc( papoOverviews, sizeof(void*) * nOverviewCount ); papoOverviews[nOverviewCount-1] = poOverviewDS; /* -------------------------------------------------------------------- */ /* Prepare update transformation information that will apply */ /* the overview decimation. */ /* -------------------------------------------------------------------- */ GDALWarpOptions *psWO = (GDALWarpOptions *) poWarper->GetOptions(); psInfo = (VWOTInfo *) CPLCalloc(sizeof(VWOTInfo),1); strcpy( psInfo->sTI.szSignature, "GTI" ); psInfo->sTI.pszClassName = "VRTWarpedOverviewTransform"; psInfo->sTI.pfnTransform = VRTWarpedOverviewTransform; psInfo->sTI.pfnCleanup = VRTWarpedOverviewCleanup; psInfo->sTI.pfnSerialize = NULL; psInfo->pfnBaseTransformer = psWO->pfnTransformer; psInfo->pBaseTransformerArg = psWO->pTransformerArg; psInfo->dfXOverviewFactor = GetRasterXSize() / (double) nOXSize; psInfo->dfYOverviewFactor = GetRasterYSize() / (double) nOYSize; /* -------------------------------------------------------------------- */ /* Initialize the new dataset with adjusted warp options, and */ /* then restore to original condition. */ /* -------------------------------------------------------------------- */ psWO->pfnTransformer = VRTWarpedOverviewTransform; psWO->pTransformerArg = psInfo; poOverviewDS->Initialize( psWO ); psWO->pfnTransformer = psInfo->pfnBaseTransformer; psWO->pTransformerArg = psInfo->pBaseTransformerArg; } CPLFree( panNewOverviewList ); /* -------------------------------------------------------------------- */ /* Progress finished. */ /* -------------------------------------------------------------------- */ pfnProgress( 1.0, NULL, pProgressData ); SetNeedsFlush(); return CE_None; }
/** Apply a vertical shift grid to a source (DEM typically) dataset. * * hGridDataset will typically use WGS84 as horizontal datum (but this is * not a requirement) and its values are the values to add to go from geoid * elevations to WGS84 ellipsoidal heights. * * hGridDataset will be on-the-fly reprojected and resampled to the projection * and resolution of hSrcDataset, using bilinear resampling by default. * * Both hSrcDataset and hGridDataset must be single band datasets, and have * a valid geotransform and projection. * * On success, a reference will be taken on hSrcDataset and hGridDataset. * Reference counting semantics on the source and grid datasets should be * honoured. That is, don't just GDALClose() it, unless it was opened with * GDALOpenShared(), but rather use GDALReleaseDataset() if wanting to * immediately release the reference(s) and make the returned dataset the * owner of them. * * Valid use cases: * * \code * hSrcDataset = GDALOpen(...) * hGridDataset = GDALOpen(...) * hDstDataset = GDALApplyVerticalShiftGrid(hSrcDataset, hGridDataset, ...) * GDALReleaseDataset(hSrcDataset); * GDALReleaseDataset(hGridDataset); * if( hDstDataset ) * { * // Do things with hDstDataset * GDALClose(hDstDataset) // will close hSrcDataset and hGridDataset * } * \endcode * * @param hSrcDataset source (DEM) dataset. Must not be NULL. * @param hGridDataset vertical grid shift dataset. Must not be NULL. * @param bInverse if set to FALSE, hGridDataset values will be added to * hSrcDataset. If set to TRUE, they will be subtracted. * @param dfSrcUnitToMeter the factor to convert values from hSrcDataset to * meters (1.0 if source values are in meter). * @param dfDstUnitToMeter the factor to convert shifted values from meter * (1.0 if output values must be in meter). * @param papszOptions list of options, or NULL. Supported options are: * <ul> * <li>RESAMPLING=NEAREST/BILINEAR/CUBIC. Defaults to BILINEAR.</li> * <li>MAX_ERROR=val. Maximum error measured in input pixels that is allowed in * approximating the transformation (0.0 for exact calculations). Defaults * to 0.125</li> * <li>DATATYPE=Byte/UInt16/Int16/Float32/Float64. Output data type. If not * specified will be the same as the one of hSrcDataset. * <li>ERROR_ON_MISSING_VERT_SHIFT=YES/NO. Whether a missing/nodata value in * hGridDataset should cause I/O requests to fail. Default is NO (in which case * 0 will be used) * <li>SRC_SRS=srs_def. Override projection on hSrcDataset; * </ul> * * @return a new dataset corresponding to hSrcDataset adjusted with * hGridDataset, or NULL. If not NULL, it must be closed with GDALClose(). * * @since GDAL 2.2 */ GDALDatasetH GDALApplyVerticalShiftGrid( GDALDatasetH hSrcDataset, GDALDatasetH hGridDataset, int bInverse, double dfSrcUnitToMeter, double dfDstUnitToMeter, const char* const* papszOptions ) { VALIDATE_POINTER1( hSrcDataset, "GDALApplyVerticalShiftGrid", nullptr ); VALIDATE_POINTER1( hGridDataset, "GDALApplyVerticalShiftGrid", nullptr ); double adfSrcGT[6]; if( GDALGetGeoTransform(hSrcDataset, adfSrcGT) != CE_None ) { CPLError(CE_Failure, CPLE_NotSupported, "Source dataset has no geotransform."); return nullptr; } const char* pszSrcProjection = CSLFetchNameValueDef(papszOptions, "SRC_SRS", GDALGetProjectionRef(hSrcDataset)); if( pszSrcProjection == nullptr || pszSrcProjection[0] == '\0' ) { CPLError(CE_Failure, CPLE_NotSupported, "Source dataset has no projection."); return nullptr; } if( GDALGetRasterCount(hSrcDataset) != 1 ) { CPLError(CE_Failure, CPLE_NotSupported, "Only single band source dataset is supported."); return nullptr; } double adfGridGT[6]; if( GDALGetGeoTransform(hGridDataset, adfGridGT) != CE_None ) { CPLError(CE_Failure, CPLE_NotSupported, "Grid dataset has no geotransform."); return nullptr; } const char* pszGridProjection = GDALGetProjectionRef(hGridDataset); if( pszGridProjection == nullptr || pszGridProjection[0] == '\0' ) { CPLError(CE_Failure, CPLE_NotSupported, "Grid dataset has no projection."); return nullptr; } if( GDALGetRasterCount(hGridDataset) != 1 ) { CPLError(CE_Failure, CPLE_NotSupported, "Only single band grid dataset is supported."); return nullptr; } GDALDataType eDT = GDALGetRasterDataType(GDALGetRasterBand(hSrcDataset,1)); const char* pszDataType = CSLFetchNameValue(papszOptions, "DATATYPE"); if( pszDataType ) eDT = GDALGetDataTypeByName(pszDataType); if( eDT == GDT_Unknown ) { CPLError(CE_Failure, CPLE_NotSupported, "Invalid DATATYPE=%s", pszDataType); return nullptr; } const int nSrcXSize = GDALGetRasterXSize(hSrcDataset); const int nSrcYSize = GDALGetRasterYSize(hSrcDataset); OGRSpatialReference oSRS; CPLString osSrcProjection(pszSrcProjection); oSRS.SetFromUserInput(osSrcProjection); if( oSRS.IsCompound() ) { OGR_SRSNode* poNode = oSRS.GetRoot()->GetChild(1); if( poNode != nullptr ) { char* pszWKT = nullptr; poNode->exportToWkt(&pszWKT); osSrcProjection = pszWKT; CPLFree(pszWKT); } } void* hTransform = GDALCreateGenImgProjTransformer3( pszGridProjection, adfGridGT, osSrcProjection, adfSrcGT ); if( hTransform == nullptr ) return nullptr; GDALWarpOptions* psWO = GDALCreateWarpOptions(); psWO->hSrcDS = hGridDataset; psWO->eResampleAlg = GRA_Bilinear; const char* pszResampling = CSLFetchNameValue(papszOptions, "RESAMPLING"); if( pszResampling ) { if( EQUAL(pszResampling, "NEAREST") ) psWO->eResampleAlg = GRA_NearestNeighbour; else if( EQUAL(pszResampling, "BILINEAR") ) psWO->eResampleAlg = GRA_Bilinear; else if( EQUAL(pszResampling, "CUBIC") ) psWO->eResampleAlg = GRA_Cubic; } psWO->eWorkingDataType = GDT_Float32; int bHasNoData = FALSE; const double dfSrcNoData = GDALGetRasterNoDataValue( GDALGetRasterBand(hGridDataset, 1), &bHasNoData ); if( bHasNoData ) { psWO->padfSrcNoDataReal = static_cast<double*>(CPLMalloc(sizeof(double))); psWO->padfSrcNoDataReal[0] = dfSrcNoData; } psWO->padfDstNoDataReal = static_cast<double*>(CPLMalloc(sizeof(double))); const bool bErrorOnMissingShift = CPLFetchBool( papszOptions, "ERROR_ON_MISSING_VERT_SHIFT", false ); psWO->padfDstNoDataReal[0] = (bErrorOnMissingShift) ? -std::numeric_limits<float>::infinity() : 0.0; psWO->papszWarpOptions = CSLSetNameValue(psWO->papszWarpOptions, "INIT_DEST", "NO_DATA"); psWO->pfnTransformer = GDALGenImgProjTransform; psWO->pTransformerArg = hTransform; const double dfMaxError = CPLAtof(CSLFetchNameValueDef(papszOptions, "MAX_ERROR", "0.125")); if( dfMaxError > 0.0 ) { psWO->pTransformerArg = GDALCreateApproxTransformer( psWO->pfnTransformer, psWO->pTransformerArg, dfMaxError ); psWO->pfnTransformer = GDALApproxTransform; GDALApproxTransformerOwnsSubtransformer(psWO->pTransformerArg, TRUE); } psWO->nBandCount = 1; psWO->panSrcBands = static_cast<int *>(CPLMalloc(sizeof(int))); psWO->panSrcBands[0] = 1; psWO->panDstBands = static_cast<int *>(CPLMalloc(sizeof(int))); psWO->panDstBands[0] = 1; VRTWarpedDataset* poReprojectedGrid = new VRTWarpedDataset(nSrcXSize, nSrcYSize); // This takes a reference on hGridDataset CPLErr eErr = poReprojectedGrid->Initialize(psWO); CPLAssert(eErr == CE_None); CPL_IGNORE_RET_VAL(eErr); GDALDestroyWarpOptions(psWO); poReprojectedGrid->SetGeoTransform(adfSrcGT); poReprojectedGrid->AddBand(GDT_Float32, nullptr); GDALApplyVSGDataset* poOutDS = new GDALApplyVSGDataset( reinterpret_cast<GDALDataset*>(hSrcDataset), poReprojectedGrid, eDT, CPL_TO_BOOL(bInverse), dfSrcUnitToMeter, dfDstUnitToMeter, // Undocumented option. For testing only atoi(CSLFetchNameValueDef(papszOptions, "BLOCKSIZE", "256")) ); poReprojectedGrid->ReleaseRef(); if( !poOutDS->IsInitOK() ) { delete poOutDS; return nullptr; } poOutDS->SetDescription( GDALGetDescription( hSrcDataset ) ); return reinterpret_cast<GDALDatasetH>(poOutDS); }