Concept:A digitizer converts analogue spatial information from a paper map into digital data for computer manipulation.
Explanation:Analogue maps store data as lines and symbols on paper, which computers cannot read directly.
To manipulate such a map digitally, the analogue data must be converted into a digital format.
A digitizer is an input device that traces or records points, lines, and areas from the map into coordinate values.
These coordinates are then transferred to a computer for editing, storage, or analysis.
This makes the digitizer the correct tool for map digitisation.
In contrast, an aerial photograph is a source image and not a converting device.
A global positioning system obtains location data from satellites, while a plotter is an output device that prints digital maps.
Therefore, the correct answer is the digitizer.
Answer:Digitizer.