[gdal-dev] gdal_translate compress is larger??
Matt Wilkie
matt.wilkie at gov.yk.ca
Wed Jun 15 13:43:40 EDT 2011
Hi Folks,
I've run into a strange thing, "gdal_translate -co compress=lzw" is
creating files that are larger than the source uncompressed image.
Input:
04/04/2006 08:39 AM 959,236,993 A1.tif
Results of "gdal_translate -co compress=[lzw,packbits,none]"
15/06/2011 10:35 AM 1,003,987,364 _lzw.tif
15/06/2011 10:31 AM 958,908,507 _none.tif
15/06/2011 10:30 AM 965,940,411 _packbits.tif
gdalinfo report is attached.
source file at http://files.environmentyukon.ca/matt/gdal-trans-lzw/ (in
about 20 minutes).
GDAL 1.8.0, released 2011/01/12
what's up?
--
matt wilkie
--------------------------------------------
Geomatics Analyst
Information Management and Technology
Yukon Department of Environment
10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
867-667-8133 Tel * 867-393-7003 Fax
http://environmentyukon.gov.yk.ca/geomatics/
--------------------------------------------
-------------- next part --------------
Driver: GTiff/GeoTIFF
Files: A1.tif
A1.aux
A1.rrd
A1.tfw
Size is 23380, 41000
Coordinate System is:
PROJCS["NAD83 / UTM zone 8N",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS 1980",6378137,298.2572221010002,
AUTHORITY["EPSG","7019"]],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4269"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",-135],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","26908"]]
Origin = (475090.000000000000000,6753500.000000000000000)
Pixel Size = (0.500000000000000,-0.500000000000000)
Metadata:
TIFFTAG_XRESOLUTION=0
TIFFTAG_YRESOLUTION=0
TIFFTAG_RESOLUTIONUNIT=1 (unitless)
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 475090.000, 6753500.000) (135d27'33.67"W, 60d54'57.01"N)
Lower Left ( 475090.000, 6733000.000) (135d27'24.20"W, 60d43'54.44"N)
Upper Right ( 486780.000, 6753500.000) (135d14'37.63"W, 60d54'59.03"N)
Lower Right ( 486780.000, 6733000.000) (135d14'32.60"W, 60d43'56.45"N)
Center ( 480935.000, 6743250.000) (135d21' 2.02"W, 60d49'26.89"N)
Band 1 Block=23380x1 Type=Byte, ColorInterp=Gray
Overviews: 5845x10250, 2923x5125, 1462x2563, 731x1282, 366x641, 183x321, 92x161, 46x81
Metadata:
LAYER_TYPE=athematic
<GDALRasterAttributeTable />
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