Kieron Dunbar wrote:
I tried to import one of the GeoTIFF rasters from
www.ordnancesurvey.gov.uk into QGis, but it seems to ignore the
co-ordinates reported by gdalinfo, as it puts the top left corner at
0,0 with a scale of 1 pixel per unit. Is there a way I can put this
file in the correct position? I haven't used QGis or GDAL before, so I
apologise if I have missed something obvious?
The properties gdalinfo reports are as follows (slightly abbreviated):
Driver: GTiff/GeoTIFF
Files: 1 250 000 Scale Raster/data/HP.tif
Size is 4000, 4000
Coordinate System is `'
Here's the problem ^^^^
After unzipping the downloaded file, if you look in the directory "data"
there's another directory "georeferencing files". There you'll find the
*.tfw (world files) for each of the the *tif files. It's strange that
they are delivered in a separate directory. Just copy all the *.tfw
files into the same dir as the *.tif files, and they'll be positioned
correctly.
One additional note: When you load the layers into QGIS, be sure to
choose the "National Grid" as the CRS. That's EPSG:27700.
Metadata:
TIFFTAG_IMAGEDESCRIPTION=1:250 000 TILE HP.TIF
TIFFTAG_DATETIME=2009:05:01 08:32:51
TIFFTAG_COPYRIGHT=ORDNANCE SURVEY CROWN COPYRIGHT 2009
TIFFTAG_XRESOLUTION=254
TIFFTAG_YRESOLUTION=254
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 4000.0)
Upper Right ( 4000.0, 0.0)
Lower Right ( 4000.0, 4000.0)
Center ( 2000.0, 2000.0)
Band 1 Block=4000x65 Type=Byte, ColorInterp=Palette
Color Table (RGB with 256 entries)
0: 59,43,48,255
...
255: 253,252,252,255
Many thanks.
Kieron Dunbar
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--
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il
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