Aerial photos are normally captured using automation and can be nadir, oblique or a mixture of both depending on the results you need. Using the settings in the automation (altitude, overlap and speed) will calculate the most efficient pattern for the photo positions. Here is a paper that covers the principles of photo acquisition for ContextCapture which includes using hand-held cameras. I guess you could apply those principles to capturing obliques using a hand-held camera from the air, but to ensure that you capture enough photos during your flight will compromise efficiency both in capture and processing.
↧