On Wed, Dec 19, 2012 at 11:23 AM, Daniel Kinzler < daniel.kinz...@wikimedia.de> wrote:
> On 19.12.2012 08:34, Nikola Smolenski wrote: > > While at it, why not separate longitude and latitude? There are items > that only > > have one, f.e. http://en.wikipedia.org/wiki/Prime_meridian# > > I'd argue that the prime meridian does not have a location. And I think it > would > be bad to make longitude or latitude optional in a geo-coordinate data > type. > What about the North and South Poles? > > What I wanted to say. Additionally, in some cases historical units are > not > > accurate or accurately known, so possibly we won't even be able to make > the > > conversion. > > I don't think we can sensibly support historical units with unknown > conversions, > because they cannot be compared directly to SI units. So, they couldn't be > used > to answer queries, can't be converted for display, etc - they arn't units > in any > sense the software can understand. This is a solvable problem, but would > add a > tremendous amount of complexity. > Won't we need lots of units that are not SI units (e.g. base pairs, IQ points, Scoville heat units, $ and €) and can't readily be translated into them? Why would historical units with unknown conversions pose any more problem than these? Avenue
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