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https://issues.apache.org/jira/browse/SIS-429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-429:
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Summary: Arithmetic operation on quantities shall use values converted to
system units (was: Arithmetic operation on quantities on values converted to
system units)
> Arithmetic operation on quantities shall use values converted to system units
> -----------------------------------------------------------------------------
>
> Key: SIS-429
> URL: https://issues.apache.org/jira/browse/SIS-429
> Project: Spatial Information Systems
> Issue Type: Improvement
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Major
> Fix For: 1.0
>
>
> The result of arithmetic operations on quantities shall be as if all values
> were converted to system quantities before the operations is performed. For
> most units, it make no difference. But for temperature in Celsius, it as more
> complex consequences (1°C + 2°C = 276.15 °C). While the above seems
> counter-intuitive, it is essential for preserving arithmetic laws like
> associativity and commutativity.
> The more intuitive result (1°C + 2°C = 3°C) requires that one of the operands
> is treated as a _temperature increment_ instead than a _temperature
> measurement_. Such distinction is out of scope of the issue, since it would
> require a change in Unit API.
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