Discussion
Which is the device used for converting maps, pictures and drawings into digital form for storage in computers?
Answer: A
Correct answer: Digitizer
A digitizer is used to trace an existing drawing or map: the operator follows the lines with a stylus or cursor and the tablet reports each position, so the result is a set of coordinates - vector data.
A scanner produces an image instead, a grid of pixels with no knowledge of what the lines are. That difference is the point: coordinates can be scaled, edited and measured, which is what mapping and computer-aided design need, whereas an image must first be traced or vectorised.
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