Why are most of the aerial photographs acquired looking straight down from the aircraft?
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Question: Why are most of the aerial photographs acquired looking straight down from the aircraft?

Answer:

The majority of USGS aircraft photography is used for cartographic purposes. Image distortion is minimized when photographs are acquired looking straight down or vertically.

Source of this FAQ:
http://edc.usgs.gov/guides/news/aerialfaq.htmlt#A20

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