Hi, For ascii data every point needs a value. Where there is missing data, you need to put in some value, which can be 0, or some other value. Make sure it is a value that the data itself will never take on; people often things like 999 or -9999,or -1.e34 (Ferret's default value). Then in your script before writing the data, you define that value to be the missing-value for the variable: SET VARIABLE/BAD=999 varIt's a good idea to use the /UNITS="units string" and /TITLE=:title string" qualifiers on the SET VARIABLE command as well, giving your variable the appropriate units and a descriptive title. That way your file will be self-documenting. Also notice that when you define your coordinate axes, /units=LONGITUDE and /units=LATITUDE do not comply with the CF data standard for longitude and latitude axes. Use: /units=degrees_east/title=LONGITUDEAnsley On 12/23/2014 12:11 AM, Nitin Patil
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