Final answer:
Oblique aerial photographs capture images at an angle with the ground, offering distinctive views useful for archaeological surveys and site identification.
Explanation:
Oblique aerial photographs are images taken from an angle where the camera's optical axis forms an oblique angle with the ground, unlike vertical aerial photographs where the optical axis is vertical. These oblique images provide a unique perspective of the Earth's surface and are commonly used in archaeological surveys to identify buried sites such as earthworks, crop marks, and soil marks. The images are taken with a 60% overlap along the flight direction to ensure proper coverage for analysis.
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