[Geotiff] GeoTIFF Model/Transform help

[Moore, Dave M (UK Rochester)]

Hi All,
I need some help creating a GeoTiff file. Basically, I've got a bitmap
which exists over the polar region. I think that a CT_PolarStereographic
setting is required to handle this, but I'm having problems with
tiepoints and defining the projection model. 
 
Basically all I know is the lat/long of the opposite corners of the
image. The first problem is the model definition. A ModelGeographic
model suggests to me that the tiepoint coordinates needs to be lat/lng
values (which is OK), but that the image has edges of constant of lat or
long, which this polar image doesn't. Also, it seems no possible to have
a PolarStereographic transform within a Geographic Model?. I could use
ModelTypeProjected, but this suggests that I would need to know the
metres/pixel value which I don't. What is the correct model?.
 
I can find very few GeoTIFF library examples.
 
Any comments or suggestions are gratefully received.
 
Thanks,
Dave
 
 

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