Signals producing each spot in a digital two-dimensional spot matrix display, such as in a digital weather radar, are compared on a spot-by- spot basis with signals for immediately proceeding and following spots in each dimension. When the preceding and following spots have the same value, the spot being compared is caused to have that same value when displayed. The comparing circuitry may be provided signals from a radar antenna which receives, serially, signals at succeeding range points at a given azimuth and then at the same range points at succeeding azimuths. Signals at each given range at a plurality of succeeding azimuths may be averaged to produce an improved visual display. The compared signals may be further smoothed by averaging signals for succeeding azimuths and displaying the averaged signals alternating with the unaveraged signals.
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