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gistDimensionedUnits
gist9.2.0 dimensioned units of measure. This extension allows (and requires) you to have a conversion factor for all units with the same dimension. If you introduce MilesPerHour you will have to supply the conversion to MetersPerSecond (even though the system "knows" how to convert Miles to meters and hours to seconds. You will have to supply an additional conversion when you introduce KilometersPerHour. Any new combination of primitive rations requires a new Dimension. While this is a burden, it allows units to be converted in SPARQL.
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Coherent Product Unit
A ratio unit whose numerator and denominator reduce to 1
Coherent Ratio Unit
A ratio unit whose numerator and denominator reduce to 1
Coherent Unit
A unit that is expressed in units that have no conversions. It may be a simple unit. It may also be a product or ratio unit that bottoms out in simple units.
Example: a simple unit: kilogram
Example: the standard unit for acceleration is meters per square second (feet per square second requires a conversion)
NOTE: coherent unit is the physics term for this, informally you might think of it as the standard unit for a given dimension.
NOTE: in principle, the CoherentUnit for a ProductUnit or RatioUnit can be inferred by recursively decomposing the products and ratios into their respective CoherentUnits, bottoming out in SimpleUnits
Convert To Standard
Note this kind of conversion will only work with temperatures if they are in Kelvin or Rankine (with a true 0). You multiply to get to the base, divide to go from the base. mph to mps is .44704. The multiple from kph to mps is .277778 . To convert 60 mph to kph is (60 * .44704 / .277778 or 96.56056 kph
Has Standard Unit
For a complex unit refers to a unit that has all the component parts in SI