gdf V1.0

# ******************************************************************************
# File:    <osgb50m_2011.ksm>
#
# Copyright (c) 2011 KAS Software Ltd, Highland, Scotland.
# Gridded data file format 1.0 - 7th September 2011
#
# Contains Ordnance Survey data (OS_OpenData)
#     (c) Crown copyright and database right 2011.
# Use of OS OpenData is subject to the terms at:
#     www.ordnancesurvey.co.uk/opendata/licence
#
# This file may be freely redistributed whole, but must not be re-sold.
# See http://www.kassoftware.co.uk/ for further details.
#
hdrTextLen = 5632
hdrLen = 18008

[GENERAL]
  fileSize = 111062245
  description = "50m Great Britain Height (2011)"
  fileCreator = KAS Software Ltd, Scotland. Sep 2011
  origFileName = osgb50m_2011.ksm
  dataOriginator = OS_OpenData
  dataInfo = OS OpenData © Crown copyright and database right 2011.
  dataRelease = OS_OpenData/LandFormPanorama/DTM/ASCII, 22/05/2011
  timeStamp = x4e8d7b48              # 06/10/2011 10:56:24
  seqNo = x33454dda
  key = 9btk-k3ty-aby7-hc4g-jqp7

[RASTER HEIGHT MAP]
  hgtType = OSGB Hgt 50m
  nativeScale = 1:500,000
  crsId = EPSG:27700                 # British National Grid
  centre = NT 50000 50000 (27700: 50.0000 x 50.0000 (0.000%))
  pixelExtent = 14000x26000
  initDispPosn = (296124, 764038)
  hgtDataType = LE_16                # Little-endian 16-bit (signed) data
  hgtUnits = Metres
  hgtRange = 0/1350                  # In height units
  areaUnits = Km2
  coverage = 242900                  # Approx. (Km2)

[RASTER MAP SEGMENT:1]
  {POSITION CALC INFO}
    posnCalcType = Linear
    tiePointXY = (0,0):(0,0)
    pixelScaleXY = 50,50

  {TILES}
    compression = INFLATE
    blocks = 14x26                   # 364
    ppb = 1000x1000
    blockSize = 2000000              # 1000x1000x2
    blockOffsetsFmt = BIG-ENDIAN,offset:5,size:3
    blockOffsetsStart = 5632
    blockOffsetsSize = 2912
    blockDataStart = 18008           # 0x4658
    blockDataSize = 79132658
    maxBlockSize = 1217319           # 60.9% of 2000000
    usedBlocks = 189                 # 51.9% of 364
[/RASTER MAP SEGMENT:1]

[RASTER MAP SEGMENT:2]
  {POSITION CALC INFO}
    posnCalcType = Linear
    tiePointXY = (0,0):(0,0)
    pixelScaleXY = 100,100
    scaleFactor = 50%

  {TILES}
    compression = INFLATE
    blocks = 14x26                   # 364
    ppb = 500x500
    blockSize = 500000               # 500x500x2
    blockOffsetsFmt = BIG-ENDIAN,offset:5,size:3
    blockOffsetsStart = 8544
    blockOffsetsSize = 2912
    blockDataStart = 79150666        # 0x4b7be4a
    blockDataSize = 23041949
    maxBlockSize = 328357            # 65.7% of 500000
    usedBlocks = 189                 # 51.9% of 364
[/RASTER MAP SEGMENT:2]

[RASTER MAP SEGMENT:3]
  {POSITION CALC INFO}
    posnCalcType = Linear
    tiePointXY = (0,0):(0,0)
    pixelScaleXY = 200,200
    scaleFactor = 25%

  {TILES}
    compression = INFLATE
    blocks = 14x26                   # 364
    ppb = 250x250
    blockSize = 125000               # 250x250x2
    blockOffsetsFmt = BIG-ENDIAN,offset:5,size:3
    blockOffsetsStart = 11456
    blockOffsetsSize = 2912
    blockDataStart = 102192615       # 0x61755e7
    blockDataSize = 6537400
    maxBlockSize = 86275             # 69.0% of 125000
    usedBlocks = 189                 # 51.9% of 364
[/RASTER MAP SEGMENT:3]

[RASTER MAP SEGMENT:4]
  {POSITION CALC INFO}
    posnCalcType = Linear
    tiePointXY = (0,0):(0,0)
    pixelScaleXY = 400,400
    scaleFactor = 12.5%

  {TILES}
    compression = INFLATE
    blocks = 14x26                   # 364
    ppb = 125x125
    blockSize = 31250                # 125x125x2
    blockOffsetsFmt = BIG-ENDIAN,offset:5,size:3
    blockOffsetsStart = 14368
    blockOffsetsSize = 2912
    blockDataStart = 108730015       # 0x67b169f
    blockDataSize = 1825628
    maxBlockSize = 22470             # 71.9% of 31250
    usedBlocks = 189                 # 51.9% of 364
[/RASTER MAP SEGMENT:4]

[RASTER MAP SEGMENT:5]
  {POSITION CALC INFO}
    posnCalcType = Linear
    tiePointXY = (0,0):(0,0)
    pixelScaleXY = 800,800
    scaleFactor = 6.25%

  {TILES}
    compression = INFLATE
    blocks = 7x13                    # 91
    ppb = 125x125
    blockSize = 31250                # 125x125x2
    blockOffsetsFmt = BIG-ENDIAN,offset:5,size:3
    blockOffsetsStart = 17280
    blockOffsetsSize = 728
    blockDataStart = 110555643       # 0x696f1fb
    blockDataSize = 506602
    maxBlockSize = 22911             # 73.3% of 31250
    usedBlocks = 59                  # 64.8% of 91
[/RASTER MAP SEGMENT:5]

[CHECKSUM]
  crcOffset = 4575
  headerCRC = 0x9d4f906c
  md5Offset = 4619
  headerMD5 = c87f7910fe0cb76eba6c7e8be1f0465e

/******************************************************************************
 *      ( ( (                                                                 *
 *       ) ) )                                                                *
 *       ( ( (  -- End of <osgb50m_2011.ksm> header --                        *
 *     '. ___ .'                                                              *
 *    '  (> <)  '                                                             *
 *****ooO*(_)*Ooo**************************************************************/
[END]

                                                                                                                                                                                                                                                                                                                                                                         
[ /GDF_HEADER ]