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The 'footprint' of a satellite is the ground area that its transponders cover, and determines the satellite dish diameter required to receive each transponder's signal. There is usually a different map for each transponder (or group of transponders) as each may be aimed to cover different areas of the ground.
Footprint maps usually show either the estimated minimal satellite dish diameter required or the signal strength in each area measured in dBW. ''See the picture of the hypotetical Footprint right.''
The footprint maps from SES Astra and Eutelsat show necessary antenna diameter/signal strength for satellites in Europe.
:''See also'': satellite dish