stmml additions

[Tim Bergsma]

Chad,

I revised eml-unitDictionary, attached.  Approximately 56 changes.

Unresolved issues:

UnitTypes...
1.  resistance has time^-5?
2.  resistivity has time^-5?
3.  conductance has time^5?
4.  metersPerDay is unitType hydraulicConductivity, yet it is also
perfectly good as a speed!  Maybe we should reclassify, and trash
hydraulicConductivity.  Or is there a mechanism to cross-list?  I'm sure
there are other examples where two unit-combinations are superficially
identical, but have very different scientific meanings.

Abbreviations...
1.  Angstrom has a perfectly good abbreviation, but it is a special
character (A with a little o above it.  Does abbreviation mean the same
thing as symbol?
2.  I no longer think it is possible or good to require abbreviations to
be unique.
3.  Note:  I stripped out the very few compound abbreviations for
consistency (g/l, ft-lbs, mg/ml), and tried to supply abbreviations for
most fundamental units.  I don't know appropriate abbreviations for
knots or rathoms.

Units...
1.  I notice that day, hour, min are never defined as units, but are
used extensively as implicit dimensions of other units.  Is this part of
the datetime bug?

Tim.

Chad Berkley wrote:
> 
> Hi Tim.
> 
> I made most of your changes.  I didn't change the base units that you
> suggested because I don't think that it is required that base units of a
> unitType, themselves must be base units.  It's easy to do the 3 way
> conversion if needed.  I did fix the multipliers you found to be
> incorrect and made most of the changes with requards to unitType names.
> I haven't done anything with the date/time stuff.  I"m waiting to see
> how the discussion progresses.I added all of your new units except for
> PH because that seems to be a discussion point as well.
> 
> The micro and omega symbols can be put into xml because it is unicode,
> but I think it's probably more trouble than it's worth because other
> applications that might process this cannot handle it.  I used other
> abbreviations how I thought appropriate.  If you think my abbreviations
> are incorrect, please let me know.
> 
> I'm going to go back today or monday and put in the parentSI attribute
> for every unit.  I haven't gotten to it yet though.
> 
> Please take a look at the dictionary as it currently stands in CVS and
> make sure I didn't mess anything up.
> 
> thanks,
> chad
> 
> On Wed, 2002-10-23 at 09:52, Tim Bergsma wrote:
> > Chad,
> >
> > marking up the datasets from my site, I find the following units that
> > are undefined in eml-unitDictionary.
> >
> > 1.  Year (awaits resolution of date, perhaps) e.g.  1999.  Year in which
> > sampling occurred.
> >
> > 2.  Date (awaiting resolution?)
> >
> > 3.  metersPerGram.  could be of type massSpecificLength.  refers to
> > fungal hyphae in grams of soil.
> >
> > 4.  cubicMicrometersPerGram.  massSpecificVolume?.  refers to bacterial
> > volume in grams of soil.
> >
> > 5.  pH. (negative log of the hydronium ion concentration of a solution,
> > where concentration is presumably molesPerLiter).
> >
> > 6.  gramsPerHectarePerDay.  multiplierToSI:  "0.0000000000011574"
> >
> > 7.  numberPerGram.  Bacterial counts.
> >
> > 8.  gramsPerSquareMeter.  multiplierToSI:  "0.001"
> >
> > I think 6-8 should certainly be added.  I'm hopeful on the others, so I
> > don't have to custom define.  I have lots of units in the form
> > gramsPerGram that I don't know what to do with.
> >
> > Note:  I think there's some inconsistency in unitDictionary names
> > regarding meterSquared vs. squareMeter.  Maybe not critical.
> >
> > Tim.
> >
> >
> > --
> > Tim Bergsma
> > LTER Information Manager
> > W.K. Kellogg Biological Station
> > Michigan State University
> > Hickory Corners, MI   49060
> > 616/671-2337
> > tbergsma at kbs.msu.edu
> > http://lter.kbs.msu.edu
> > _______________________________________________
> > eml-dev mailing list
> > eml-dev at ecoinformatics.org
> > http://www.ecoinformatics.org/mailman/listinfo/eml-dev
> --
> -----------------------
> Chad Berkley
> National Center for
> Ecological Analysis
> and Synthesis (NCEAS)
> berkley at nceas.ucsb.edu
> -----------------------

-- 
Tim Bergsma
LTER Information Manager
W.K. Kellogg Biological Station
Michigan State University
Hickory Corners, MI   49060
616/671-2337
tbergsma at kbs.msu.edu
http://lter.kbs.msu.edu
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