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On-screen digitizing is an interactive process in which a map is created using previously digitized of scanned information. This method of geocoding is commonly called "heads-up" digitizing because the attention of the user is focused up on the screen, and not on a digitizing tablet. This technique may be used to trace features from a scanned map or image to create new layers or themes. On-screen digitizing may also be employed in an editing session where there is enough information on the screen to accurately add new features without a reference image or map.
The process of on-screen digitizing is similar to conventional digitizing. Rather than using a digitizer and a cursor, the user creates the map layer up on the screen with the mouse and typically with referenced information as a background.
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