Why is
there a need for georeferencing in GIS?
nMaps are a
common source of input data for a GIS.
Often input maps will be in different projections,
requiring transformation of one or all maps to make coordinates
compatible.
GIS are
used for projects of global or regional scales so consideration of the
effect of the earth's curvature is necessary.
nMonitor
screens are analogous to a flat sheet of paper, and need transformations from the curved surface to the plane for displaying
data.