Hi Hanh,You want to make a multi-file dataset (also called a descriptor file). You will create a descriptor file which lists your file names and information about the time steps. Then you can open this descriptor file in Ferret and it will appear as a single dataset.There are tools for creating a descriptor file, documented here:
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/converting-to-netcdf/CREATING-A-MULTI-FILE-NETCDF-DATA-SET#_VPINDEXENTRY_1144 The general information about this concept is here: http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/converting-to-netcdf/CREATING-A-MULTI-FILE-NETCDF-DATA-SETIf you have trouble, please take a look at this thread, about multi-file datasets;
http://www.pmel.noaa.gov/maillists/tmap/ferret_users/fu_2009/msg00536.htmlThen to compute the climatology, use the modulo regridding operation. http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/Grids-Regions/GRIDS#Chapter4-Modulo_regridding
This operation automatically takes leap years into account. Ansley nguyen@xxxxxxxxxx wrote:
Hi ferreters I'd like to compute a daily climatology from a 1989-2009 data. I have one file per year (because of the BIG size of the data I can't have all years in one single file). Is there a easy way to obtain the climatology from these files, considering leap years too? Thanks Hanh