If you want to measure the size of an object, let’s say the length, width and height of a house, then normally you will carry this out directly at the object. Now imagine that the house didn’t exist anymore—it was destroyed, but some historic photos exist. Then, if you can determine the scale of the photos, it must be possible to get the desired data.
KeywordsFocal Length Camera Position Geometric Principle Digital Photogrammetry Exterior Orientation
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