I was hoping someone might ask this one. Someone asked about this a few
months back. I didn't have an answer then, but a few weeks later I came
up with an idea. I have been dabbling with some remote sensing imagery.
Most of these images are supplied as square bitmaps, eg they are x rows
by y columns, but the flight paths are usually not north to south. They
may be orientated at say 20� to the west of north (340�). When you
register the image, and overlay vector layers, the raster layer remains
square (ie unrotated), but all overlying vector layers are then rotated
(in the above case) 20� to the east of north. Do you follow me?
My brainstorm (a few weeks late) was that you could create a small white
bitmap in some graphics package. It would help to use something that
allows you to size the image fairly precisely (say 100 pixels * 100 pixels).
Then if you want to rotate your vector layers 20� clockwise, you register
the image as if it was orientated at 340� (how's your trig?). The handy
thing about all of this, is that with all of this rotating, all the text
remains completely unaffected. If a label was added with a rotation angle
of zero, it remains horizontal regardless of the rotation angle placed on
the vectors.
I hope I have explained this clearly.
Russell Harris
PNG Department of Mining
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