Paper 3 · June 2023 · GIS: georeferencing, digitising and measurement
In QGIS, the operation of assigning real world coordinates to a scanned map image by matching identified points on the image to known ground coordinates is required before any measurement can be taken from it. Name this operation.
Model answer
georeferencing
Also accepted: georeference, georeferencing the map, geo-referencing
Explanation
Georeferencing fits a transformation between image coordinates and real world coordinates using ground control points, and writes the result so the raster overlays vector layers correctly. Until it is done, distances and areas measured from the scan mean nothing.
Derived from ZIMSEC Advanced Level Geography 6037/3 Paper 3 Practical Test, June 2023 session, Q3