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Digital Photogrammetry - A Practical Course (Paperback, 3rd ed. 2009)
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Digital Photogrammetry - A Practical Course (Paperback, 3rd ed. 2009)
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1.1 Basic idea and main task of photogrammetry 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 pos- ble to get the
desired data. Of course you can use photos to get information about
objects. This kind of - formation is different: So, for example,
you may receive qualitative data (the house seems to be old, the
walls are coloured light yellow) from photo interpre- tion, or
quantitative data like mentioned before (the house has a base size
of 8 by 6 meters) from photo measurement, or information in
addition to your background knowledge (the house has elements of
the "art nouveau" style, so may be c- th structed at the beginning
of the 20 century), and so on.
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