Hi Frederic, You say you have one file for each month. That sounds as if you'd really like to think of all of them together as a single dataset. In the example for January 1998 you show, what you want is the first daily value from February 1998 to use in computing the 6-hour values of january 31, hour 5, 12, and so forth, right? If this is the case, you should create a multi-file dataset descriptor file for the monthly data, define a 6-hour time axis for the whole time range, and do the regridding to the 6-hour time axis in one step. There are a couple of tools available for creating descriptor files if your monthly data is in netCDF files. Have a look at the section of the Users Guide on descriptor files, http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/converting-to-netcdf/CREATING-A-MULTI-FILE-NETCDF-DATA-SET and read down to the section called "tools for making descriptor files" which will tell you where to get those tools and how to use them. Ansley Frederic.Cyr@xxxxxxxxxx wrote:
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