1. Introduction to GIS for the Purpose of Practising PGIS
On-screen Digitising
By: Jon Corbett and Kasondra White
Unit: M12U04

2. Introduction
The process of extracting spatial features from a digital image
These include:
scanned maps
aerial photographs
digital photographs
Useful for turning data into georeferenced map layers

3. Digitising Converting a paper map into a digital format
Incorporating this into a GIS
Also known as geocoding
Points, linear features and areas often employ manual digitising
Associating coordinates and topographical data
Adapted from GIS Core Curriculum for Technical Programmes. Written by Lesley-Ann Dupigny-Giroux,Geography Department, University of Vermont. Trainers may wish to refer to this resource.

4. On-screen digitising Captures data from digital images using the mouse
Grants a higher level of accuracy
Allows for editing of features
User creates the layer on the screen with the mouse
Referenced information as a background
Trainers may wish to open QGIS and demonstrate the process of creating and editing a new layer. Following this, trainers could invite trainees to discuss when on-screen digitising would be useful.