Multi Looking

Im relatively new to radar and recently started processing Sentinel 1A. Im using the IW GRD data. My question is since this data is already L1 processed is it necessary to preform Multilook?


S1-A ground range detected (GRD) products have already been multi-looked as given in Table 5-1 (p 5-2) of the Sentinel-1 Product Definition document available at So it is not necessary to perform multi-looking again.