On 3/22/2011 6:53 AM, John Caron wrote:
Consider:

   int time(sample=1001);
     :long_name = "Measurement time";
     :standard_name = "time";
     :units = "days since 1970-01-01";

vs

   int time(sample=1001);
     :long_name = "Measurement time";
     :standard_name = "time";
     :units = "3 days since 1970-01-01";

values = 1, 2, 3, ...

are these equivalent or does the second one mean every 3 days ? Is the second one illegal ?

Im am going to assume that the second form is illegal, that is, you may not have a number in front of the unit in a "time coordinate unit" (CF section 4.4)
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