Hi,
I'm trying to use the fortran routines to write groups which include
variables with an unlimited (time) dimension. My test case is a model that
outputs 23 time slices. When I run it without using groups or have a group
that contains a variable with static dimensions the size of the time
dimension is correct (23). However, when I try to include a variable with a
time dimension in the group, the size of the time dimension jumps to be the
same as the largest space dimension (x2d).
One post I found (File size, unlimited dimensions, compression and chunks)
suggests changing the chunking of the unlimited variable to something other
than one. I increased the chunking on the time dimension to 512, and it made
no difference.
######################################################
With no groups
netcdf test1_tseries {
dimensions:
time = UNLIMITED ; // (23 currently)
x2d = 99 ;
y2d = 5 ;
variables:
double time(time) ;
time:long_name = "time" ;
time:units = "days since 2002-10-01 00:00:00 +00:00" ;
short el(time, y2d, x2d) ;
el:long_name = "Surface elevation" ;
el:units = "m" ;
// global attributes:
:title = "Test case channel" ;
}
######################################################
With group defined and a static dimension variable added to it
netcdf test1_tseries {
dimensions:
time = UNLIMITED ; // (23 currently)
x2d = 99 ;
y2d = 5 ;
variables:
double time(time) ;
time:long_name = "time" ;
time:units = "days since 2002-10-01 00:00:00 +00:00" ;
short el(time, y2d, x2d) ;
el:long_name = "Surface elevation" ;
el:units = "m" ;
// global attributes:
:title = "Test case channel" ;
group: elev {
variables:
double h(y2d, x2d) ;
h:long_name = "Bottom depth" ;
h:units = "m" ;
} // group elev
}
######################################################
with group defined and a time varying variable added
netcdf test1_tseries {
dimensions:
time = UNLIMITED ; // (99 currently)
x2d = 99 ;
y2d = 5 ;
variables:
double time(time) ;
time:long_name = "time" ;
time:units = "days since 2002-10-01 00:00:00 +00:00" ;
// global attributes:
:title = "Test case channel" ;
group: elev {
variables:
short el(time, y2d, x2d) ;
el:long_name = "Surface elevation" ;
el:units = "m" ;
} // group elev
}
######################################################
with different space dimensions
netcdf test1_tseries {
dimensions:
time = UNLIMITED ; // (70 currently)
x2d = 70 ;
y2d = 5 ;
variables:
double time(time) ;
time:long_name = "time" ;
time:units = "days since 2002-10-01 00:00:00 +00:00" ;
// global attributes:
:title = "Test case channel" ;
group: elev {
variables:
short el(time, y2d, x2d) ;
el:long_name = "Surface elevation" ;
el:units = "m" ;
} // group elev
}
Thanks
Glenn Carter
Department of Oceanography
University of Hawaii
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