Matthias Basler a écrit :
> I am well aware of this problem. My preferred solution would be following
> method in the API:
> csFactory.getAuthorityUnitCodes(Class<Quantity>Quantity)
> This way I could also separately retrieve units of quantity "Length" or
> "Angle" without having to filter them by EPSG number range afterwards.
Sound like a nice idea (I didn't though about a Class<? extends Quantity>
argument).
> 1. What's the reason for this? Can/should we do anything about it?
This is because the EPSG database contains enough information only for units
that are proportional to a base units like meters or radians. It can not
describe more complex units like sexagesimal degrees. An other reason is that
instead than creating a new Unit instance for degrees, we would like to
leverage
the existing NonSI.DEGREE_ANGLE instance.
> 2. Where can I find this hardcoded list either in code or in the
> documentation?
> Is it the set of units defined by JSR-275?
In the DirectEpsgFactory (if my memory serve me right, or maybe
AbstractEpsgFactory - we have a duplication of code right now that need to be
cleaned). There is a static method, getUnit(String) I believe, which is
implemented as a switch statement returning different SI or NonSI instance
depending on the given code.
Martin
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