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#361 Use Netcdf-3 64-bit offset format for split-ncvars single-file … #367

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Merged
merged 1 commit into from
Aug 28, 2025
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#361 Use Netcdf-3 64-bit offset format for split-ncvars single-file … #367

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9 changes: 7 additions & 2 deletions src/split_ncvars/split_ncvars.pl.in
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Original file line number Diff line number Diff line change
Expand Up @@ -495,10 +495,15 @@ foreach my $file (@ifiles) {
} ### end of variable loop ###

#--- extract fields for single file option ---
# Hard-code Netcdf-3 output format for single-file option
# FRE uses the single-file option exclusively for creating the static pp file, which does not work properly with Netcdf-4. This error results:
# ERROR NC_ELATEFILL (formerly NC_EFILLVALUE) Attempt to define fill value when data already exists
# HINT: NC_ELATEFILL errors can occur when NCO attempts to create, modify, or overwrite a _FillValue attribute
# for an existing variable in a netCDF4 file. The netCDF4 format (unlike netCDF3) does not permit this.
if ( $Opt{onefile} ) {
my $vlist = join ",", @vlist;
print "$ncks -h -A -v $vlist $file $Opt{onefile}\n" if $Opt{VERBOSE} > 0;
system("$ncks -h -A -v $vlist $file $Opt{onefile}");
print "$ncks -6 -h -A -v $vlist $file $Opt{onefile}\n" if $Opt{VERBOSE} > 0;
system("$ncks -6 -h -A -v $vlist $file $Opt{onefile}");
$ncstatus += $?;

my @ncatted_opts = set_ncatted_opts( $Opt{onefile}, tailname( $Opt{onefile} ) );
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