The GDAL API tutorial describes this array as:
adfGeoTransform[0]/* top left x */
adfGeoTransform[1]/* w-e pixel resolution */
adfGeoTransform[2]/* rotation, 0 if image is "north up" */
adfGeoTransform[3]/* top left y */
adfGeoTransform[4]/* rotation, 0 if image is "north up" */
adfGeoTransform[5]/* n-s pixel resolution */
The GDAL Data model page says
Xgeo = GT(0) + Xpixel*GT(1) + Yline*GT(2)
Ygeo = GT(3) + Xpixel*GT(4) + Yline*GT(5)
where the GT[i]are the coeffs described above.
From this I conclude that the rotations are not sin/cos of the rotation, but
rather the sin/cos times the
appropriate pixel size. Is that right, or did I miss something?
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