jamesdudden wrote:
Frank,
I would very much like to find out more about turning a TIFF into a geoTIFF
- simply because so far a geoTIFF is all i have working.
James,
Unfortunately, I don't know the correct coordinate system for your image, so
I just give one example. If you wanted to assign a UTM 11 WGS84 coordinate
system you could do it like this:
gdal_translate -a_srs "+proj=utm +zone=11 +datum=WGS84" -co COMPRESS=LZW
SavillsSSETq12sw.tif SavillsSSETq12sw_geo.tif
I didn't see any compression on your source image, but being one bit
data it would likely shrink it considerably.
The -a_srs (assign spatial reference system) switch to gdal_translate
will allow you to specify the coordinate system in quite a few different
ways. There is some additional discussion of this in the general options
section of:
http://www.gdal.org/gdal_utilities.html
In this case we are assuming that gdal_translate will pick up the .tfw
when reading and will incorporate the georeferencing from it into the
resulting geotiff. If it did not exist, you could also add the
-a_ullr commandline switch to assign upper left and lower right corner
coordinates.
More detail on the gdal_translate command is available at:
http://www.gdal.org/gdal_translate.html
More details on the GDAL GeoTIFF driver options (like COMPRESS=LZW) are
available at:
http://www.gdal.org/frmt_gtiff.html
Note that the FWTools Shell is a regular windows command window, but with
the environment carefully setup to use the FWTools tools and dlls. You can
"cd" to other directories, etc.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [EMAIL PROTECTED]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | President OSGeo, http://osgeo.org
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