This file holds some information about the example_3857.tif file generated 
using the given commands.


########################
listgeo example_3857.tif
########################
Geotiff_Information:
   Version: 1
   Key_Revision: 1.0
   Tagged_Information:
      ModelTiepointTag (2,3):
         0                0                0                
         100              350              0                
      ModelPixelScaleTag (1,3):
         10               10               0                
      End_Of_Tags.
   Keyed_Information:
      GTModelTypeGeoKey (Short,1): ModelTypeProjected
      GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
      GTCitationGeoKey (Ascii,25): "WGS 84 / Pseudo-Mercator"
      GeogCitationGeoKey (Ascii,7): "WGS 84"
      GeogAngularUnitsGeoKey (Short,1): Angular_Degree
      ProjectedCSTypeGeoKey (Short,1): Unknown-3857
      ProjLinearUnitsGeoKey (Short,1): Linear_Meter
      End_Of_Keys.
   End_Of_Geotiff.

PCS = 3857 (WGS 84 / Pseudo-Mercator)
Projection = 3856 (Popular Visualisation Pseudo-Mercator)
Projection Method: CT_Mercator
   ProjNatOriginLatGeoKey: 0.000000 (  0d 0' 0.00"N)
   ProjNatOriginLongGeoKey: 0.000000 (  0d 0' 0.00"E)
   ProjScaleAtNatOriginGeoKey: 1.000000
   ProjFalseEastingGeoKey: 0.000000 m
   ProjFalseNorthingGeoKey: 0.000000 m
GCS: 4326/WGS 84
Datum: 6326/World Geodetic System 1984
Ellipsoid: 7030/WGS 84 (6378137.00,6356752.31)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)
Projection Linear Units: 9001/metre (1.000000m)

Corner Coordinates:
Upper Left    (     100.000,     350.000)  (  0d 0' 3.23"E,  0d 0'11.40"N)
Lower Left    (     100.000,      50.000)  (  0d 0' 3.23"E,  0d 0' 1.63"N)
Upper Right   (     500.000,     350.000)  (  0d 0'16.17"E,  0d 0'11.40"N)
Lower Right   (     500.000,      50.000)  (  0d 0'16.17"E,  0d 0' 1.63"N)
Center        (     300.000,     200.000)  (  0d 0' 9.70"E,  0d 0' 6.51"N)


#########################
gdalinfo example_3857.tif
#########################
Driver: GTiff/GeoTIFF
Files: example_3857.tif
Size is 40, 30
Coordinate System is:
PROJCS["WGS 84 / Pseudo-Mercator",
    GEOGCS["WGS 84",
        DATUM["WGS_1984",
            SPHEROID["WGS 84",6378137,298.257223563,
                AUTHORITY["EPSG","7030"]],
            AUTHORITY["EPSG","6326"]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433],
        AUTHORITY["EPSG","4326"]],
    PROJECTION["Mercator_1SP"],
    PARAMETER["central_meridian",0],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    AUTHORITY["EPSG","3857"],
    EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs"],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]]]
Origin = (100.000000000000000,350.000000000000000)
Pixel Size = (10.000000000000000,-10.000000000000000)
Metadata:
  AREA_OR_POINT=Area
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (     100.000,     350.000) (  0d 0'3.23"E,  0d 0'11.32"N)
Lower Left  ( 100.0000000,  50.0000000) (  0d 0'3.23"E,  0d 0'1.62"N)
Upper Right (     500.000,     350.000) (  0d 0'16.17"E,  0d 0'11.32"N)
Lower Right (     500.000,      50.000) (  0d 0'16.17"E,  0d 0'1.62"N)
Center      (     300.000,     200.000) (  0d 0'9.70"E,  0d 0'6.47"N)
Band 1 Block=40x30 Type=Byte, ColorInterp=Gray


#########################
tiffinfo example_3857.tif
#########################
TIFFReadDirectory: Warning, example_3857.tif: unknown field with tag 33550 (0x830e) encountered.
TIFFReadDirectory: Warning, example_3857.tif: unknown field with tag 33922 (0x8482) encountered.
TIFFReadDirectory: Warning, example_3857.tif: unknown field with tag 34735 (0x87af) encountered.
TIFFReadDirectory: Warning, example_3857.tif: unknown field with tag 34737 (0x87b1) encountered.
TIFF Directory at offset 0x8 (8)
  Image Width: 40 Image Length: 30
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: min-is-black
  Samples/Pixel: 1
  Rows/Strip: 30
  Planar Configuration: single image plane
  Tag 33550: 10.000000,10.000000,0.000000
  Tag 33922: 0.000000,0.000000,0.000000,100.000000,350.000000,0.000000
  Tag 34735: 1,1,0,7,1024,0,1,1,1025,0,1,1,1026,34737,25,0,2049,34737,7,25,2054,0,1,9102,3072,0,1,3857,3076,0,1,9001
  Tag 34737: WGS 84 / Pseudo-Mercator|WGS 84|


#########################
tiffdump example_3857.tif
#########################
example_3857.tif:
Magic: 0x4949 <little-endian> Version: 0x2a
Directory 0: offset 8 (0x8) next 0 (0)
ImageWidth (256) SHORT (3) 1<40>
ImageLength (257) SHORT (3) 1<30>
BitsPerSample (258) SHORT (3) 1<8>
Compression (259) SHORT (3) 1<1>
Photometric (262) SHORT (3) 1<1>
StripOffsets (273) LONG (4) 1<363>
SamplesPerPixel (277) SHORT (3) 1<1>
RowsPerStrip (278) SHORT (3) 1<30>
StripByteCounts (279) LONG (4) 1<1200>
PlanarConfig (284) SHORT (3) 1<1>
SampleFormat (339) SHORT (3) 1<1>
33550 (0x830e) DOUBLE (12) 3<10 10 0>
33922 (0x8482) DOUBLE (12) 6<0 0 0 100 350 0>
34735 (0x87af) SHORT (3) 32<1 1 0 7 1024 0 1 1 1025 0 1 1 1026 34737 25 0 2049 34737 7 25 2054 0 1 9102 ...>
34737 (0x87b1) ASCII (2) 33<WGS 84 / Pseudo-Mercator ...>