I don't think that you can avoid using RPC data.
Your image is in pixel coordinate system, i.e. the origin point is located at the top left corner. You have to transform the image to image coordinate system (interior orientation) and finally to object coordinate system (exterior coordinate system). RPC data contains the coefficients necessary for these transformations.
Best wishes.
Shame the posting is not actually in Antarctica and the pay is way to low.
I did 15 months in Antarctica and loved every minute of it, apart from the cold, the snow, the really cold, the wind.
The Russians used to visit and much Vodka was consumed (For medicinal purposes only)