03_0024.hdf'
      gridname    = 'GreenBand'
      fieldname   = 'Green Radiance/RDQI'
      line        = 50.0
      sample      = 25.0
      start_block = 10
      end_block   = 15
      <B>status = MTK_FILE_TO_PATH( filename, path )</B>
      <B>status = MTK_SETREGION_BY_PATH_BLOCKRANGE( path, start_block, end_block, region)</B>
      <B>status = MTK_READDATA( filename, gridname, fieldname, region, databuf, mapinfo )</B>
      <B>status = MTK_LS_TO_SOMXY</B>( <B>mapinfo, line, sample, somx, somy</B> <B>)