Re: netCDF Java 2.1 changes

Robert B. Schmunk wrote:


I was just rebuilding a netCDF app of mine to use the new netCDF 2.1
jar which apparently was posted to the Unidata website in the last few
weeks. I ran into one problem which I wanted to ask about. I figured
out a workaround in about 5 minutes, but as I don't see the information
listed anywhere on the Unidata website, I just wanted to confirm
with you that what I encountered reflects some sort of intentional
change. (And make sure I'm not losing my marbles by not being able to
find the info anymore. ;-)

Previously I was using sliceMA to extract a lat-lon 2D array from a
VariableStandardized which might have 2+ dimensions. Now I can't seem
to find any reference to sliceMA in VariableStandardized or in any of
the classes which it either extends or implements. It was easy enough
to modify my code to instead use, but I did
find it confusing that sliceMA basically seems to have disappeared
without any apparent trace.

BTW: I also noted with interest the apparently new ucar.nc2.dataset.conv
package. I don't know if this would be any use at the present time, but
I thought I might mention that during January I wrote a couple of
classes which parse relative-time and absolute-time units and generate
readable date strings. The relative-time parser also understands climate
model calendars such as noleap and all_leap but requires a new subclass
of Calendar which I also had to write.


Robert B. Schmunk, rschmunk@xxxxxxxxxxxxx
NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025

Hi Robert:

Congatulations, you are the first (besides me) to use version 2.1! I just put it out on Friday, and I am still getting all of the pieces out and the documentation finished. Notice its an "alpha" release, so beware of bugs.

I have decided to use a different route for the sliceMA() functionality. The new way is to use specialized adapter classes in ucar.ma2:

public MultiArraySlice(MultiArray ma, int dim, int value);

Create a new MultiArray as a "slice" of this MultiArray, which reduces the rank by one by fixing the value of one of the dimensions at the given value.

Besides slice, there is also a "section" adapter, and I will add others as needed. I think this will be a cleaner way to add new "views" of a Variable, better then adding new methods in the interface. Let me know what you think of that approach.

I should have deprecated sliceMA() instead of removing it. I just got into one of those "get rid of the junk" mentalities. I will at least document that more clearly.

I would be very interested in including your time parsing routines. The Convention parsing stuff in ucar.nc2.dataset.conv is pretty incomplete, and I am still adding new functionality; i hope it will stabilize in the next few weeks. I am interested in any feedback you have, also any netCDF files that you use a lot, to add to my test suite.


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