<div dir="ltr">A friend, a relative newcomer to GIS, is having problems loading some of
the TIFs created with Mapinfo into QGIS. Each TIF has a TAB file and in
some cases the TAB file is interpreted correctly and in other cases the
TAB file is (apparently) not recognised.
<br><br>I think this might be a problem with Gdal rather than a problem
with QGIS. Taking just two of the TIFs, the output from gdalinfo when
run on 33044061.TIF indicates that things are working as they should.
However, when gdalinfo is run on 33044071.TIF the spatial data in its
TAB file is not recognised. See the listings below.
<br><br>The strange thing is that all of the TIFs can successfully be
converted from TIF to GeoTIFF using gdalwarp. (But it is important to my
friend that he should be able to open Mapinfo raster images directly.)
<br><br>Any ideas?
<br><br>Regards,
<br>Nick.
<br><br><br>Contents of 33044061.TAB:
<br>------------------------
<br>!table
<br>!version 300
<br>!charset WindowsLatin1
<br><br>Definition Table
<br> File "33044061.tif"
<br> Type "RASTER"
<br> (582429,263569) (1,7594) Label "Pt 1",
<br> (582372,265177) (1,0) Label "Pt 2",
<br> (584784,265263) (11335,1) Label "Pt 3",
<br> (584841,263655) (11335,7594) Label "Pt 4"
<br> CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 400000, -100000
<br> Units "m"
<br><br>Results of running gdalinfo on 33044061.TIF:
<br>-------------------------------------------
<br>nick@nick-6150M2MA:~/Desktop/tabstuff$ gdalinfo 33044061.TIF
<br>Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription"
contains null byte in value; value incorrectly truncated during reading
due to implementation limitations
<br>Driver: GTiff/GeoTIFF
<br>Files: 33044061.TIF
<br>Size is 11335, 7594
<br>Coordinate System is:
<br>PROJCS["unnamed",
<br> GEOGCS["unnamed",
<br> DATUM["OSGB_1936",
<br> SPHEROID["Airy 1930",6377563.396,299.3249646],
<br> TOWGS84[375,-111,431,-0,-0,-0,0]],
<br> PRIMEM["Greenwich",0],
<br> UNIT["degree",0.0174532925199433]],
<br> PROJECTION["Transverse_Mercator"],
<br> PARAMETER["latitude_of_origin",49],
<br> PARAMETER["central_meridian",-2],
<br> PARAMETER["scale_factor",0.9996012717],
<br> PARAMETER["false_easting",400000],
<br> PARAMETER["false_northing",-100000],
<br> UNIT["Meter",1]]
<br>GeoTransform =
<br> 582371.785312838, 0.2128106799708935, 0.007506419931892793
<br> 265177.0453393974, 0.007597130759524194, -0.2117600570261751
<br>Metadata:
<br> TIFFTAG_IMAGEDESCRIPTION=
<br> TIFFTAG_XRESOLUTION=300
<br> TIFFTAG_YRESOLUTION=300
<br> TIFFTAG_MINSAMPLEVALUE=0
<br> TIFFTAG_MAXSAMPLEVALUE=1
<br> TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
<br>Image Structure Metadata:
<br> COMPRESSION=CCITTFAX4
<br> INTERLEAVE=BAND
<br> MINISWHITE=YES
<br>Corner Coordinates:
<br>Upper Left ( 582371.785, 265177.045) ( 0d40'19.83"E, 52d15'14.75"N)
<br>Lower Left ( 582428.789, 263568.939) ( 0d40'19.71"E, 52d14'22.68"N)
<br>Upper Right ( 584783.994, 265263.159) ( 0d42'27.09"E, 52d15'14.63"N)
<br>Lower Right ( 584840.998, 263655.053) ( 0d42'26.92"E, 52d14'22.57"N)
<br>Center ( 583606.392, 264416.049) ( 0d41'23.39"E, 52d14'48.66"N)
<br>Band 1 Block=512x512 Type=Byte, ColorInterp=Palette
<br> Image Structure Metadata:
<br> NBITS=1
<br> Color Table (RGB with 2 entries)
<br> 0: 255,255,255,255
<br> 1: 0,0,0,255
<br>nick@nick-6150M2MA:~/Desktop/tabstuff$
<br><br>Contents of 33044071.TAB:
<br>------------------------
<br>!table
<br>!version 300
<br>!charset WindowsLatin1
<br><br>Definition Table
<br> File "33044071.tif"
<br> Type "RASTER"
<br> (584841,263655) (1,7576) Label "Pt 1",
<br> (584784,265263) (1,0) Label "Pt 2",
<br> (587197,265349) (11335,1) Label "Pt 3",
<br> (587254,263740) (11335,7576) Label "Pt 4"
<br> CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 400000, -100000
<br> Units "m"
<br><br>Results of running gdalinfo on 33044071.TIF:
<br>-------------------------------------------
<br>nick@nick-6150M2MA:~/Desktop/tabstuff$ gdalinfo 33044071.TIF
<br>Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription"
contains null byte in value; value incorrectly truncated during reading
due to implementation limitations
<br>Driver: GTiff/GeoTIFF
<br>Files: 33044071.TIF
<br>Size is 11335, 7576
<br>Coordinate System is `'
<br>GCP Projection =
<br>PROJCS["unnamed",
<br> GEOGCS["unnamed",
<br> DATUM["OSGB_1936",
<br> SPHEROID["Airy 1930",6377563.396,299.3249646],
<br> TOWGS84[375,-111,431,-0,-0,-0,0]],
<br> PRIMEM["Greenwich",0],
<br> UNIT["degree",0.0174532925199433]],
<br> PROJECTION["Transverse_Mercator"],
<br> PARAMETER["latitude_of_origin",49],
<br> PARAMETER["central_meridian",-2],
<br> PARAMETER["scale_factor",0.9996012717],
<br> PARAMETER["false_easting",400000],
<br> PARAMETER["false_northing",-100000],
<br> UNIT["Meter",1]]
<br>GCP[ 0]: Id=Pt 1, Info=
<br> (1,7576) -> (584841,263655,0)
<br>GCP[ 1]: Id=Pt 2, Info=
<br> (1,0) -> (584784,265263,0)
<br>GCP[ 2]: Id=Pt 3, Info=
<br> (11335,1) -> (587197,265349,0)
<br>GCP[ 3]: Id=Pt 4, Info=
<br> (11335,7576) -> (587254,263740,0)
<br>Metadata:
<br> TIFFTAG_IMAGEDESCRIPTION=
<br> TIFFTAG_XRESOLUTION=300
<br> TIFFTAG_YRESOLUTION=300
<br> TIFFTAG_MINSAMPLEVALUE=0
<br> TIFFTAG_MAXSAMPLEVALUE=1
<br> TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
<br>Image Structure Metadata:
<br> COMPRESSION=CCITTFAX4
<br> INTERLEAVE=BAND
<br> MINISWHITE=YES
<br>Corner Coordinates:
<br>Upper Left ( 0.0, 0.0)
<br>Lower Left ( 0.0, 7576.0)
<br>Upper Right (11335.0, 0.0)
<br>Lower Right (11335.0, 7576.0)
<br>Center ( 5667.5, 3788.0)
<br>Band 1 Block=512x512 Type=Byte, ColorInterp=Palette
<br> Image Structure Metadata:
<br> NBITS=1
<br> Color Table (RGB with 2 entries)
<br> 0: 255,255,255,255
<br> 1: 0,0,0,255
<br>nick@nick-6150M2MA:~/Desktop/tabstuff$
<br clear="all"><br>-- <br>Nick Hopton, Caversham, Reading, England.
</div>