How to retrieve subdatasets of HDF images

Some raster formats can contain multiple subdatasets inside a single file, for example the HDF format. This sample code shows how one can retrieve the HDF subdatasets using the IRasterDatasetJukebox interface.

How to use

Reference libraries: ESRI.ArcGIS.DataSourcesRaster, ESRI.ArcGIS.Geodatabase, ESRI.ArcGIS.Geometry.
Call this function from your code.

[VBA]


        Public Function Subdataset(sPath As String, sHDFName As String) As IRasterDataset
    'This example is used to query and save out the subdatasets of an HDF raster data.
    
    'Open an HDF raster dataset
    Dim pWorkspaceFact As IWorkspaceFactory
    Dim pWs As IRasterWorkspace
    Dim pRasterDS As IRasterDataset
    Set pWorkspaceFact = New RasterWorkspaceFactory
    Set pWs = pWorkspaceFact.OpenFromFile(sPath, 0)
    Set pRasterDS = pWs.OpenRasterDataset(sHDFName)
    
    'Use IRasterDatasetJukebox
    Dim pHDFSubDataset As IRasterDataset
    Dim pDatasetJukebox As IRasterDatasetJukebox
    Set pDatasetJukebox = pRasterDS
    Dim pSaveAs As ISaveAs
    
    Dim DatasetCount As Integer, i As Integer
    DatasetCount = pDatasetJukebox.SubdatasetCount
    
    For i = 0 To DatasetCount - 1
        'Get the ith sudataset as a raster dataset
        pDatasetJukebox.subdataset = i
        Set pHDFSubDataset = pDatasetJukebox
        
        'Save the subdataset out
        Set pSaveAs = pHDFSubDataset
        pSaveAs.SaveAs "hdfsubimage" + i + ".img", pWs, "IMAGINE Image"
    Next i
End Function