[Gdal-dev] NITF ICHIPB Extension?
William Lyons
wlyons at prologic-inc.com
Fri Dec 10 14:26:42 EST 2004
Frank,
>However, I notice the GDALRPCInfo structure (and corresponding
>metadata) have fields named dfLINE_OFF, dfSAMP_OFF, dfLINE_SCALE
>and dfSAMP_SCALE. I think it would be much easier to just adjust these
>if the change is just a non-rotated windowing.
I agree. But, the chips I'm working with are rotated. Which leads me
to another question about the geo-transform. I'm assuming that the
values at indices 2 and 4 are how I would define a rotation. My
assumption is that the value at index 2 is a ratio of change in x as
line increases and the value at index 4 is a ratio of change in y as
pixel increases. Please tell me I'm wrong and there's an easier way so
I don't have to calculate these for a rotated chip.
Thanks,
William Lyons
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