World Files - Defining Image Rotation

[Guillaume Sueur]

Hi,

It doesn't help so much on the precise point of rotation parameters.
I've had the same problem few days ago, and despite many tests I didn't
manage to get a proper rotated image. I fixed that with a "solid"
rotation, set into the image file. But I'm also interested by that approach.

What are the units of rotation parameters ? I think it's radians, but
maybe directly cos and sin of angle in radian which would be more
adequate tu use in the six parameters transformation...

Is it counter-clockwise (i.e. trigonometric) direction ?

is the first one x or y rotation term ? The ESRI support page
(http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=17489)
is useless.

the best info I've found are here :
http://www.omg.unb.ca/~jonnyb/processing/geotiff_tifw_format.html

but I haven't tried yet.

Guillaume