Yeah, still that implies that the order of the files specified in the
aggregation must be the same as the order of values for the aggregated
dimension inside those files themselves. I can find no such
specification though, but maybe I am missing it. It seems that in the
examples on
http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/ncml/Aggregation.html,
the files are always specified in order.
Otherwise we have to the rather expensive operation of going through all
of the Strings,convert them to Dates, then find the minimum/maximum for
each time getMimimum() and getMaximum() is called. But then again, I
wonder if we shouldn't do the same for non-time values (regular
CoordinateValue).
What do you think?
Regards
Niels
On 28-09-16 11:41, Daniele Romagnoli wrote:
Hi Niels,
On Wed, Sep 28, 2016 at 11:05 AM, Niels Charlier <ni...@scitus.be
<mailto:ni...@scitus.be>> wrote:
On 23-09-16 17:03, Daniele Romagnoli wrote:
I think that once the aggregation is in place, times can be in
any order as you reported, so I think it's time to revisit the
timeVariable min/max computation (not sure there are other
methods around based on that supposition. I didn't check it yet).
Although, it seems that in netcdf-java's
CoordinateAxis1D.getMinValue() en CoordinateAxis1D.getMaxValue(),
an assumption is made that the extremes are at the beginning and end.
Good catch. Are you referring to this?
https://github.com/Unidata/thredds/blob/5.0.0/cdm/src/main/java/ucar/nc2/dataset/CoordinateAxis1D.java#L286
https://github.com/Unidata/thredds/blob/5.0.0/cdm/src/main/java/ucar/nc2/dataset/CoordinateAxis1D.java#L295
It does take into account the order may be decreasing as well as
increasing, but not random.
Perhaps we should remain consistent with that?
I would say yes.
Cheers,
Daniele
Regards
Niels
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