Discussion
Georeferencing an image in GIS means to :
Answer: B
Georeferencing means to assign real world coordinates to the image so it aligns with other spatial data.
A scanned map or an aerial photograph starts with only pixel positions. Georeferencing links known points on the image, called ground control points, to their real coordinates and then transforms the whole image into a map projection. After that it overlays correctly on roads, field boundaries and other layers in the GIS.
Compressing an image only reduces file size, converting it to vectors is digitising or vectorisation, and changing the colour depth only affects display. None of these gives the image a location on the earth.
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