ossimHdf5ImageDataset.cpp

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//----------------------------------------------------------------------------
//
// License:  LGPL
// 
// See LICENSE.txt file in the top level directory for more details.
//
// Author:  David Burken
//
// Description: OSSIM HDF5 Image DataSet.
//
//----------------------------------------------------------------------------
// $Id

#include <ossim/hdf5/ossimHdf5ImageDataset.h>
#include <ossim/base/ossimCommon.h>
#include <ossim/base/ossimEndian.h>
#include <ossim/base/ossimIpt.h>
#include <ossim/base/ossimIrect.h>
#include <ossim/base/ossimNotify.h>
#include <ossim/base/ossimScalarTypeLut.h>
#include <ossim/hdf5/ossimHdf5ImageHandler.h>

//---
// This includes everything!  Note the H5 includes are order dependent; hence,
// the mongo include.
//---
#include <hdf5.h>
#include <H5Cpp.h>

#include <iostream>

ossimHdf5ImageDataset::ossimHdf5ImageDataset(ossimHdf5ImageHandler* owner)
:  m_handler(owner),
   m_dataset(0),
   m_scalar(OSSIM_SCALAR_UNKNOWN),
   m_bands(1),
   m_lines(0),
   m_samples(0),
   m_endian(0)
{   
   if (owner)
      m_hdf5 = owner->m_hdf5;

   m_validRect.makeNan();
}

ossimHdf5ImageDataset::ossimHdf5ImageDataset( const ossimHdf5ImageDataset& obj )
:  m_handler(obj.m_handler),
   m_hdf5 (obj.m_hdf5),
   m_dataset(obj.m_dataset),
   m_scalar(obj.m_scalar),
   m_bands(obj.m_bands),
   m_lines(obj.m_lines),
   m_samples(obj.m_samples),
   m_endian( obj.m_endian ? new ossimEndian() : 0 ),
   m_validRect(obj.m_validRect)
{
}

ossimHdf5ImageDataset::~ossimHdf5ImageDataset()
{
   close();
}

const ossimHdf5ImageDataset& ossimHdf5ImageDataset::operator=( const ossimHdf5ImageDataset& rhs )
{
   if ( this != &rhs )
   {
      m_dataset     = rhs.m_dataset;
      m_dataSpace   = rhs.m_dataSpace;
      m_scalar      = rhs.m_scalar;
      m_bands       = rhs.m_bands;
      m_lines       = rhs.m_lines;
      m_samples     = rhs.m_samples;
      m_validRect   = rhs.m_validRect;
      m_endian      = ( rhs.m_endian ? new ossimEndian() : 0 );
   }
   return *this;
}

bool ossimHdf5ImageDataset::initialize( const H5::DataSet& dataset)
{
   close();

   m_dataset = dataset;

   determineScalarType();

//   if (!determineExtents() || !scanForValidImageRect() || !scanForMinMax())
   if (!determineExtents())// || !scanForMinMax())
      return false;

   return true;

} // End: ossimH5ImageDataset::initialize

bool ossimHdf5ImageDataset::determineExtents()
{
   try
   {
      // Find the valid image rect. dataset may have null padding:
      H5::DataSpace imageDataspace = m_dataset.getSpace();
      int rank = imageDataspace.getSimpleExtentNdims();
      if (rank < 2)
         return false;

      // Get the extents. Assuming dimensions are same for lat lon dataset.
      std::vector<hsize_t> inputSize(rank);
      imageDataspace.getSimpleExtentDims( &inputSize.front(), 0 );
      m_lines = inputSize[0];
      m_samples = inputSize[1];
      m_validRect = ossimDrect(ossimDpt(0,0),ossimDpt(m_samples-1,m_lines-1));
      if ( rank >= 3 )
         m_bands = inputSize[2];
      else
         m_bands = 1;

      if ( (m_lines == 0) || (m_samples == 0) )
         return false;
   }
   catch( const H5::Exception& e )
   {
      std::cout << "ERROR:" << e.getDetailMsg()<< " \n";
      ossimNotify(ossimNotifyLevel_WARN)<<e.getDetailMsg();
      return false;
   }

   return true;
}

bool ossimHdf5ImageDataset::scanForValidImageRect()
{
#if 0
   // THIS IS ORIGINAL BURKEN CODE -- SEEMS TO SCAN TOO MUCH BUT MAYBE NEEDED IN POLAR PROJECTION
   // CASES SO KEEPING AROUND (OLK 09/2016)
   bool result = false;
   H5::DataSpace imageDataspace = m_dataset.getSpace();
   const ossim_int32 IN_DIM_COUNT = imageDataspace.getSimpleExtentNdims();

   if ( IN_DIM_COUNT == 2 )
   {
      // Get the extents. Assuming dimensions are same for lat lon dataset.
      std::vector<hsize_t> dimsOut(IN_DIM_COUNT);
      imageDataspace.getSimpleExtentDims( &dimsOut.front(), 0 );

      if ( dimsOut[0] && dimsOut[1] )
      {

         //---
         // Capture the rectangle:
         // dimsOut[0] is height, dimsOut[1] is width:
         //---
         m_validRect = ossimIrect( 0, 0,
                                   static_cast<ossim_int32>( dimsOut[1]-1 ),
                                   static_cast<ossim_int32>( dimsOut[0]-1 ) );

         const ossim_int32 WIDTH  = m_validRect.width();

         std::vector<hsize_t> inputCount(IN_DIM_COUNT);
         std::vector<hsize_t> inputOffset(IN_DIM_COUNT);

         inputOffset[0] = 0;
         inputOffset[1] = 0;

         inputCount[0] = 1;
         inputCount[1] = WIDTH;

         // Output dataspace dimensions.
         const ossim_int32 OUT_DIM_COUNT = 3;
         std::vector<hsize_t> outputCount(OUT_DIM_COUNT);
         outputCount[0] = 1;     // single band
         outputCount[1] = 1;     // single line
         outputCount[2] = WIDTH; // whole line

         // Output dataspace offset.
         std::vector<hsize_t> outputOffset(OUT_DIM_COUNT);
         outputOffset[0] = 0;
         outputOffset[1] = 0;
         outputOffset[2] = 0;

         ossimScalarType scalar = getScalarType();
         if ( scalar == OSSIM_FLOAT32 )
         {
            // Native type:
            H5::DataType datatype = m_dataset.getDataType();

            // Output dataspace always the same one line.
            H5::DataSpace bufferDataSpace( OUT_DIM_COUNT, &outputCount.front());
            bufferDataSpace.selectHyperslab( H5S_SELECT_SET,
                                             &outputCount.front(),
                                             &outputOffset.front() );

            //---
            // Dataset sample has NULL lines at the end so scan for valid rect.
            // Use "<= -999" for test as per NOAA as it seems the NULL value is
            // fuzzy.  e.g. -999.3.
            //---
            const ossim_float32 NULL_VALUE = -999.0;

            //---
            // VIIRS Radiance data has a -1.5e-9 in the first column.
            // Treat this as a null.
            //---
            ossimString name = m_dataset.getObjName();
            const ossim_float32 NULL_VALUE2 = ( name == "/All_Data/VIIRS-DNB-SDR_All/Radiance" )
                                 ? -1.5e-9 : NULL_VALUE;
            const ossim_float32 TOLERANCE = 0.1e-9; // For ossim::almostEqual()

            // Hold one line:
            std::vector<ossim_float32> values( WIDTH );

            // Find the ul pixel:
            ossimIpt ulIpt = m_validRect.ul();
            bool found = false;

            // Line loop to find upper left pixel:
            while ( ulIpt.y <= m_validRect.lr().y )
            {
               inputOffset[0] = static_cast<hsize_t>(ulIpt.y);
               imageDataspace.selectHyperslab( H5S_SELECT_SET,
                                               &inputCount.front(),
                                               &inputOffset.front() );

               // Read data from file into the buffer.
               m_dataset.read( (void*)&values.front(), datatype, bufferDataSpace, imageDataspace );

               if ( m_endian )
               {
                  // If the endian pointer is initialized(not zero) swap the bytes.
                  m_endian->swap( scalar, (void*)&values.front(), WIDTH );
               }

               // Sample loop:
               ulIpt.x = m_validRect.ul().x;
               ossim_int32 index = 0;
               while ( ulIpt.x <= m_validRect.lr().x )
               {
                  if ( !ossim::almostEqual(values[index], NULL_VALUE2, TOLERANCE) &&
                        ( values[index] > NULL_VALUE ) )
                  {
                     found = true; // Found valid pixel.
                     break;
                  }
                  ++ulIpt.x;
                  ++index;

               } // End: sample loop

               if ( found )
               {
                  break;
               }

               ++ulIpt.y;

            } // End line loop to find ul pixel:

            // Find the lower right pixel:
            ossimIpt lrIpt = m_validRect.lr();
            found = false;

            // Line loop to find last pixel:
            while ( lrIpt.y >= m_validRect.ul().y )
            {
               inputOffset[0] = static_cast<hsize_t>(lrIpt.y);
               imageDataspace.selectHyperslab( H5S_SELECT_SET,
                                               &inputCount.front(),
                                               &inputOffset.front() );

               // Read data from file into the buffer.
               m_dataset.read( (void*)&values.front(), datatype, bufferDataSpace, imageDataspace );

               if ( m_endian )
               {
                  // If the endian pointer is initialized(not zero) swap the bytes.
                  m_endian->swap( scalar, (void*)&values.front(), WIDTH );
               }

               // Sample loop:
               lrIpt.x = m_validRect.lr().x;
               ossim_int32 index = WIDTH-1;

               while ( lrIpt.x >= m_validRect.ul().x )
               {
                  if ( !ossim::almostEqual(values[index], NULL_VALUE2, TOLERANCE) &&
                        ( values[index] > NULL_VALUE ) )
                  {
                     found = true; // Found valid pixel.
                     break;
                  }
                  --lrIpt.x;
                  --index;

               } // End: sample loop

               if ( found )
               {
                  break;
               }

               --lrIpt.y;

            } // End line loop to find lower right pixel.

            m_validRect = ossimIrect( ulIpt, lrIpt );
            result = true;

         }
         else // Matches: if ( scalar == OSSIM_FLOAT32 ){...}
         {
            ossimNotify(ossimNotifyLevel_WARN)
                                 << "ossimHdf5ImageDataset:"<<__LINE__<<" WARNING!"
                                 << "\nUnhandled scalar type: "
                                 << ossimScalarTypeLut::instance()->getEntryString( scalar )
                                 << std::endl;
         }

      } // Matches: if ( dimsOut...

   } // Matches: if ( IN_DIM_COUNT == 2 )

   //cout << "ossimHdf5ImageDataset:"<<__LINE__<<" m_validRect = "<<m_validRect<<endl;
   return true;

#else
   // REFACTORED
   try
   {
      // Find the valid image rect. dataset may have null padding:
      H5::DataSpace imageDataspace = m_dataset.getSpace();
      H5::DataType dataType = m_dataset.getDataType();
      ossim_uint32 elem_size = (ossim_uint32)dataType.getSize();

      // Get the extents. Assuming dimensions are same for lat lon dataset.
      hsize_t rowSize[2]  = { 1, m_samples };
      hsize_t imageOffset[2] = { 0, 0 };

      // Allocate space for read buffer:
      char *rowBuf = new char[elem_size*m_samples];
      char *fill_value = new char[elem_size];

      // Output dataspace always the same one line.
      H5::DataSpace bufferDataSpace( 2, rowSize);
      bufferDataSpace.selectHyperslab( H5S_SELECT_SET, rowSize, imageOffset ); // offset = (0,0) here

      // Figure out the null pixel value (unswapped since doing byte compare below):
      H5Pget_fill_value(m_dataset.getId(), dataType.getId(), fill_value);

      // Find the ul pixel. Loop over rows:
      ossimIpt ulIpt (0,0);
      bool found_valid = false;
      for (; (ulIpt.y<(int)m_lines) && !found_valid; ulIpt.y++)
      {
         imageOffset[0] = ulIpt.y;
         imageDataspace.selectHyperslab( H5S_SELECT_SET, rowSize, imageOffset);
         m_dataset.read(rowBuf, dataType, bufferDataSpace, imageDataspace );

         // Scan row for valid pixel:
         ossim_int64 rowOffset = 0;
         for (ulIpt.x=0; (ulIpt.x<(int)m_samples) && !found_valid; ulIpt.x++, rowOffset+=elem_size)
            found_valid = (memcmp(&rowBuf[rowOffset], fill_value, elem_size) != 0);
      }
      if (!found_valid)
         ulIpt = ossimIpt(0,0);

      // Find the lr pixel. Loop over rows:
      ossimIpt lrIpt (m_samples-1, m_lines-1);
      found_valid = false;
      for (; (lrIpt.y>ulIpt.y) && !found_valid; lrIpt.y--)
      {
         imageOffset[0] = lrIpt.y;
         imageDataspace.selectHyperslab( H5S_SELECT_SET, rowSize, imageOffset);
         m_dataset.read(rowBuf, dataType, bufferDataSpace, imageDataspace );

         // Scan row for valid pixel:
         ossim_int64 rowOffset = m_samples*elem_size - 1;
         for (lrIpt.x=m_samples-1; (lrIpt.x>ulIpt.x) && !found_valid; lrIpt.x-- , rowOffset-=elem_size)
            found_valid = (memcmp(&rowBuf[rowOffset], fill_value, elem_size) != 0);
      }
      if (!found_valid)
         lrIpt = ossimIpt (m_samples-1, m_lines-1);

      m_validRect.set_ul(ulIpt);
      m_validRect.set_lr(lrIpt);

      imageDataspace.close();

      delete [] rowBuf;
      delete [] fill_value;
      return true;
   }
   catch( const H5::Exception& e )
   {
      ossimNotify(ossimNotifyLevel_WARN)<<e.getDetailMsg();
      return false;
   }

#endif
}

bool ossimHdf5ImageDataset::scanForMinMax()
{
   // Create buffer to hold the clip rect for a single band.
   ossimScalarType scalarType = getScalarType();

   if((scalarType == OSSIM_SCALAR_UNKNOWN)||
      (scalarType == OSSIM_UINT64) ||
      (scalarType == OSSIM_SINT64)
      )
   {
      return false;
   }
   // if ((scalarType != OSSIM_FLOAT32) && (scalarType != OSSIM_FLOAT64) &&
   //       (scalarType != OSSIM_UINT32)  && (scalarType != OSSIM_SINT32)  &&
   //       (scalarType != OSSIM_UINT8)   && (scalarType != OSSIM_SINT8)   &&
   //       (scalarType != OSSIM_UINT16)  && (scalarType != OSSIM_SINT16))
   // {
   //    return false;
   // }

   ossim_uint32 bufSizeInBytes = m_validRect.width()*ossim::scalarSizeInBytes(scalarType);
   vector<char> dataBuffer(bufSizeInBytes);

   // Get the extents. Assuming dimensions are same for lat lon dataset.
   ossimIpt ulIpt (m_validRect.ul());
   ossimIpt lrIpt (m_validRect.lr());
   const ossim_float32 nullpix = m_handler->getNullPixelValue();
   ossim_float32 epsilon = (ossim_float32)0.1e-9; // For ossim::almostEqual()

   if (nullpix == 0.0)
      epsilon = 0;

   m_minValue.clear();
   m_maxValue.clear();

   ossimIrect clipRect (m_validRect.ul(), m_validRect.ur());
   for (ossim_uint32 band=0; band<m_bands; ++band)
   {
      m_minValue.push_back(OSSIM_DEFAULT_MAX_PIX_FLOAT);
      m_maxValue.push_back(OSSIM_DEFAULT_MIN_PIX_FLOAT);

      for (int y=ulIpt.y; y<=lrIpt.y; y++)
      {
         clipRect.set_uly(y);
         clipRect.set_lry(y);

         getTileBuf(&dataBuffer.front(), clipRect, band, false);

         // Scan and fix non-standard null value:
         ossim_float32 value = 0;
         for ( ossim_uint32 x=0; x<m_validRect.width(); ++x )
         {
            switch (scalarType)
            {
            case OSSIM_FLOAT32:
               value = ((ossim_float32*)&dataBuffer.front())[x];
               break;
            case OSSIM_FLOAT64:
               value = (ossim_float32) ((ossim_float64*)&dataBuffer.front())[x];
               break;
            case OSSIM_UINT8:
            case OSSIM_SINT8:
               value = (ossim_float32) ((char*)&dataBuffer.front())[x];
               break;
            case OSSIM_UINT16:
            case OSSIM_SINT16:
               value = (ossim_float32) ((ossim_int16*)&dataBuffer.front())[x];
               break;
            case OSSIM_UINT32:
            case OSSIM_SINT32:
               value = (ossim_float32) ((ossim_int32*)&dataBuffer.front())[x];
               break;
            default:
               break;
            }

            if (ossim::almostEqual<ossim_float32>(value, nullpix, epsilon))
               continue;
            if (value > m_maxValue[band])
               m_maxValue[band] = value;
            if (value < m_minValue[band])
               m_minValue[band] = value;
         }
      }
   }

   //cout<<"ossimHdf5ImageDataset:"<<__LINE__<<"\n\tminValue="<<m_minValue[0]<<
   //      "\n\tmaxValue="<<m_maxValue[0]<<"\n\tnullValue="<<m_handler->getNullPixelValue()<<endl; // TODO REMOVE

   return true;
}

void ossimHdf5ImageDataset::close()
{
   m_dataset.close();
   delete m_endian;
}

const H5::DataSet* ossimHdf5ImageDataset::getDataset() const
{
   return &m_dataset;
}

H5::DataSet* ossimHdf5ImageDataset::getDataset()
{
   return &m_dataset;
}

string ossimHdf5ImageDataset::getName() const
{
   return m_dataset.getObjName();
}

ossimScalarType ossimHdf5ImageDataset::getScalarType() const
{
   return m_scalar;
}

bool ossimHdf5ImageDataset::determineScalarType()
{
   m_scalar = OSSIM_SCALAR_UNKNOWN;

   try
   {
      H5T_class_t typeClass = m_dataset.getTypeClass();
      if ( ( typeClass != H5T_INTEGER ) && ( typeClass != H5T_FLOAT ) )
         return false;

      hid_t mem_type_id = H5Dget_type( m_dataset.getId() );
      if( mem_type_id < 0 )
         return false;

      hid_t native_type = H5Tget_native_type(mem_type_id, H5T_DIR_DEFAULT);
      if( H5Tequal(H5T_NATIVE_CHAR, native_type) )
         m_scalar = OSSIM_SINT8;
      else if ( H5Tequal( H5T_NATIVE_UCHAR, native_type) )
         m_scalar = OSSIM_UINT8;
      else if( H5Tequal( H5T_NATIVE_SHORT, native_type) )
         m_scalar = OSSIM_SINT16;
      else if(H5Tequal(H5T_NATIVE_USHORT, native_type))
         m_scalar = OSSIM_UINT16;
      else if(H5Tequal( H5T_NATIVE_INT, native_type))
         m_scalar = OSSIM_SINT32;
      else if(H5Tequal( H5T_NATIVE_UINT, native_type ) )
         m_scalar = OSSIM_UINT32;
      else if(H5Tequal( H5T_NATIVE_LONG, native_type))
         m_scalar = OSSIM_SINT32;
      else if(H5Tequal( H5T_NATIVE_ULONG, native_type))
         m_scalar = OSSIM_UINT32;
      else if(H5Tequal( H5T_NATIVE_LLONG, native_type))
         m_scalar = OSSIM_SINT64;
      else if(H5Tequal( H5T_NATIVE_ULLONG, native_type))
         m_scalar = OSSIM_UINT64;
      else if(H5Tequal( H5T_NATIVE_FLOAT, native_type))
         m_scalar = OSSIM_FLOAT32;
      else if(H5Tequal( H5T_NATIVE_DOUBLE, native_type))
         m_scalar = OSSIM_FLOAT64;
      // See if we need to swap bytes:
      if (m_hdf5->getByteOrder(&m_dataset) != ossim::byteOrder())
         m_endian = new ossimEndian();
   }
   catch( const H5::Exception& e )
   {
      ossimNotify(ossimNotifyLevel_WARN)<<e.getDetailMsg();
      return false;
   }

   return true;
}

ossim_uint32 ossimHdf5ImageDataset::getNumberOfBands() const
{
   return m_bands;
}

ossim_uint32 ossimHdf5ImageDataset::getNumberOfLines() const
{
   return m_validRect.height();
}

ossim_uint32 ossimHdf5ImageDataset::getNumberOfSamples() const
{
   return m_validRect.width();
}

bool ossimHdf5ImageDataset::getSwapFlag() const
{
   return (m_endian ? true: false);
}

const ossimIpt& ossimHdf5ImageDataset::getSubImageOffset() const
{
   return m_validRect.ul();
}

const ossimIrect& ossimHdf5ImageDataset::getValidImageRect() const
{
   return m_validRect;
}

void ossimHdf5ImageDataset::getTileBuf(void* buffer, const ossimIrect& rect,
                                       ossim_uint32 band, bool /* scale */)
{
   static const char MODULE[] = "ossimHdf5ImageDataset::getTileBuf";

   if (band >= m_bands)
      return;

   // Shift rectangle by the sub image offse (if any) from the m_validRect.
   // NOTE: The rect coming in seems to be alreadyt in image space so no need to offset (OLK 09/2016)
   ossimIrect irect = rect;// + m_validRect.ul();

   try
   {
      // Turn off the auto-printing when failure occurs so that we can
      // handle the errors appropriately
      // H5::Exception::dontPrint();

      // Get dataspace of the dataset.
      H5::DataSpace imageDataSpace = m_dataset.getSpace();

      // Number of dimensions of the input dataspace.:
      const ossim_int32 IN_DIM_COUNT = imageDataSpace.getSimpleExtentNdims();

      // Native type:
      H5::DataType dataType = m_dataset.getDataType();

      std::vector<hsize_t> inputCount(IN_DIM_COUNT);
      std::vector<hsize_t> inputOffset(IN_DIM_COUNT);

      if ( IN_DIM_COUNT == 2 )
      {
         inputOffset[0] = irect.ul().y;
         inputOffset[1] = irect.ul().x;

         inputCount[0] = irect.height();
         inputCount[1] = irect.width();
      }
      else
      {
         inputOffset[0] = band;
         inputOffset[1] = irect.ul().y;
         inputOffset[2] = irect.ul().x;

         inputCount[0] = 1;
         inputCount[1] = irect.height();
         inputCount[2] = irect.width();
      }

      // Define hyperslab in the dataset; implicitly giving strike strike and block NULL.
      imageDataSpace.selectHyperslab( H5S_SELECT_SET,
                                      &inputCount.front(),
                                      &inputOffset.front() );

      // Output dataspace dimensions.
      const ossim_int32 OUT_DIM_COUNT = 3;
      std::vector<hsize_t> outputCount(OUT_DIM_COUNT);
      outputCount[0] = 1;             // single band
      outputCount[1] = irect.height(); // lines
      outputCount[2] = irect.width();  // samples

      // Output dataspace offset.
      std::vector<hsize_t> outputOffset(OUT_DIM_COUNT);
      outputOffset[0] = band;
      outputOffset[1] = 0;
      outputOffset[2] = 0;

      // Output dataspace.
      H5::DataSpace bufferDataSpace( OUT_DIM_COUNT, &outputCount.front());
      bufferDataSpace.selectHyperslab( H5S_SELECT_SET,
                                       &outputCount.front(),
                                       &outputOffset.front() );

      // Read data from file into the buffer.
      m_dataset.read( buffer, dataType, bufferDataSpace, imageDataSpace );

      if ( m_endian )
      {
         // If the m_endian pointer is initialized(not zero) swap the bytes.
         m_endian->swap( m_scalar, buffer, irect.area() );
      }


      //#define NEVER
#ifdef NEVER
      if (scale)
      {
         const ossim_float32 TOLERANCE = 0.1e-9; // For ossim::almostEqual()
         // Scale the data:
#if 1
         // Assumes float32 datatype:
         double gain = 1.0/( m_maxValue[band] - m_minValue[band] );
         ossim_float32 null_value = m_handler->getNullPixelValue(band);
         ossim_float32 value;
         for (ossim_uint32 i=0; i<irect.area(); ++i)
         {
            value = ((ossim_float32*)buffer)[i];

            if (!ossim::almostEqual(value,null_value, TOLERANCE))
            {
               value = gain*(value - m_minValue[band]);
               ((ossim_float32*)buffer)[i] =value;
            }
         }
#else
         // Does not assume float32:
         ossimScalarType scalarType = getScalarType();
         double null_value = m_handler->getNullPixelValue(band);
         for (ossim_uint32 i=0; i<irect.area(); ++i)
         {
            switch (scalarType)
            {
            case OSSIM_FLOAT32:
               if (!ossim::almostEqual(((ossim_float32*)buffer)[i], (ossim_float32)null_value))
                  ((ossim_float32*)buffer)[i] =
                        (ossim_float32)(gain*(((ossim_float32*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_FLOAT64:
               if (!ossim::almostEqual(((ossim_float64*)buffer)[i], null_value))
                  ((ossim_float64*)buffer)[i] =
                        (ossim_float64)(gain*(((ossim_float64*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_UINT8:
               if (((ossim_uint8*)buffer)[i] != (ossim_uint8)null_value)
                  ((ossim_uint8*)buffer)[i] =
                        (ossim_uint8)(gain*(((ossim_uint8*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_SINT8:
               if (((ossim_sint8*)buffer)[i] != (ossim_sint8)null_value)
                  ((ossim_sint8*)buffer)[i] =
                        (ossim_sint8)(gain*(((ossim_sint8*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_UINT16:
               if (((ossim_uint16*)buffer)[i] != (ossim_uint16)null_value)
                  ((ossim_uint16*)buffer)[i] =
                        (ossim_uint16)(gain*(((ossim_uint16*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_SINT16:
               if (((ossim_sint16*)buffer)[i] != (ossim_sint16)null_value)
                  ((ossim_sint16*)buffer)[i] =
                        (ossim_sint16)(gain*(((ossim_sint16*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_UINT32:
               if (((ossim_uint32*)buffer)[i] != (ossim_uint32)null_value)
                  ((ossim_uint32*)buffer)[i] =
                        (ossim_uint32)(gain*(((ossim_uint32*)buffer)[i] - m_minValue[band]));
               break;
            case OSSIM_SINT32:
               if (((ossim_sint32*)buffer)[i] != (ossim_sint32)null_value)
                  ((ossim_sint32*)buffer)[i] =
                        (ossim_sint32)(gain*(((ossim_sint32*)buffer)[i] - m_minValue[band]));
               break;
            default:
               break;
            }
         }
#endif
      }
#endif

      // Cleanup:
      bufferDataSpace.close();
      dataType.close();
      imageDataSpace.close();
   }
   catch( const H5::Exception& error )
   {
      ossimNotify(ossimNotifyLevel_WARN) << MODULE << " caught H5 Exception!" << std::endl;
      error.printError();
   }

   catch( ... )
   {
      ossimNotify(ossimNotifyLevel_WARN)<< MODULE << " caught unknown exception !" << std::endl;
   }

} // End: ossimH5ImageDataset::getTileBuf


double ossimHdf5ImageDataset::getMaxPixelValue(ossim_uint32 band) const
{
   if (band < m_maxValue.size())
      return m_maxValue[band];

   return  ossim::defaultMax(m_scalar);
}

double ossimHdf5ImageDataset::getMinPixelValue(ossim_uint32 band) const
{
   if (band < m_minValue.size())
      return m_minValue[band];
   return  ossim::defaultMin(m_scalar);
}

bool ossimHdf5ImageDataset::isMinPixelSet()const
{
   return (!m_minValue.empty());
}

bool ossimHdf5ImageDataset::isMaxPixelSet()const
{
   return (!m_maxValue.empty());
}

std::ostream& ossimHdf5ImageDataset::print( std::ostream& out ) const
{
   try
   {
      out << "ossimH5ImageDataset: "
            << "\nH5::DataSet::id: " << m_dataset.getId()
            << "\nname:            " << m_dataset.getObjName()
            << "\nscalar:          " << ossimScalarTypeLut::instance()->getEntryString( m_scalar )
            << "\nbands:           " << m_bands
            << "\nlines:           " << m_lines
            << "\nsamples:         " << m_samples
            << "\nvalid rect:      " << m_validRect
            << "\nswap_flage:      " << (m_endian?"true":"false")
            << std::endl;
   }
   catch( const H5::Exception& e )
   {
      ossimNotify(ossimNotifyLevel_WARN)<<e.getDetailMsg();
   }

   return out;
}

std::ostream& operator<<( std::ostream& out, const ossimHdf5ImageDataset& obj )
{
   return obj.print( out );
}