[Mapserver-users] Problems with rotating a tiff/tfw image

[Frank Warmerdam]

Larry Hurst wrote:
> I have a tiff image with a tfw world (State Plane) file that displays 
> fine in the map display (UTM).
> I am testing whether I can rotate the image in the map display using 
> world file transformations.
> Once the world file changes have been made, the image no longer shows up 
> in the map display.
> To test, I am using ArcView to rotate the image and create an updated 
> world file.
> Does anybody have any ideas what may be causing the image display to fail?


Larry,

What you are trying should work.  I have successfully used images with
rotation via world file.  However, it is critical that the file be
processed via the GDAL code path in MapServer, not the basic MapServer
built-in TIFF support.  To be maximally sure configure mapserver
"--without-tiff".

I would add that for problem reports like this it is helpful to report the
mapserver version (via mapserv -v output).  You should use at least mapserv
4 to do the rotated thing.

Finally, if you have a working unrotated image, try just editing the .tfw
by hand and slighly altering the rotational coefficients a bit to see if
you get an effect through mapserver before moving over to the properly
rotated image.

Best regards,

-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Programmer for Rent