I have UGRID (unstructured grid) files I'm aggregating, so FMRC is out.
Plan B: Is there a way to use NcML to trick joinExisting aggregation
to give me an unlimited dimension for time?
I found this page:
where it sounds like adding a global attribute via NcML
<attribute name="DODS_EXTRA/Unlimited_Dimension" value="time"/>
might have worked. But I tried it, and it doesn't.
Does anyone have another idea?
On Tue, Dec 4, 2012 at 6:22 PM, Signell, Richard <rsignell@xxxxxxxx> wrote:
> Thredds folks,
> We've got 33 years of ocean model output in monthly NetCDF3 files
> that we have been aggregating into a single virtual 33TB dataset using
> joinExisting aggregation along the time dimension:
> This works fine, but two issues have arisen:
> 1) the monthly files start at 0000 on the first day of the month, and
> end on 2400 of the last day of the month. Thus when aggregated with
> joinExisting, we get duplicate time and data values at the end of
> every month.
> 2) when accessing the data via OPeNDAP, the dataset doesn't have an
> unlimited time dimension. This causes the "nc3tonc4" conversion
> program in NetCDF4-Python to try to read each variable in it's
> entirety, which of course is problematic. If "nc3tonc4" sees an
> unlimited dimension, it can "chunk" its way along.
> So we could eliminate both these problems by using a FMRC aggregation, right?
> Dr. Richard P. Signell (508) 457-2229
> USGS, 384 Woods Hole Rd.
> Woods Hole, MA 02543-1598
Dr. Richard P. Signell (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598