Why can some instances of exception values (-999999) rather than zeros be seen in the topographic correction fields in a clear sea image?
Most topographic correction tie points over sea are set to zero (as the sea is at sea level). However, exception values (notably 999999) can arise in the current algorithm if no pixel at a given across-track position regrids to a particular topographic correction tie point. This occurs because there is no cosmetic fill in the topographic correction and the array is initialised to 999999 before calculations commence.
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