If you have any experience in this subject...or if you can guide me to good reading material would be glad. Not familier with this yet. 

Comparing between a good quality georeferenced orthophoto and a historical aerial photo, seems to be a high-oblique photograph. Covergages are different, they partly overlap.The times taken are different, historical one is laiden with long shadows. Both have 3 bands each; RGB. Historical photo, RGB values are quite close (not the same though!). It also has bad data: as white  strips plus white patches of data (not pure white; data are there, DN is higher, so WHITER). Fiducial marks are there, but no information on the geolocations. Tried to register regions of interest of the historical photo to the orthophoto using known locations, but everytime, ended up having expanded objects in the historical photograph, eventhough locations are quite closer to the orthophoto.

Is georeferencing and orthorectifying required? couldn't this be achieved only with registering?

Is it possible to use this kind of an aerial image for a change detection for at least planly visible areas?

Thanks

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