Measurement:Units - Revision history

Samuel at 20:36, 10 June 2026

2026-06-10T20:36:29Z

← Older revision		Revision as of 20:36, 10 June 2026
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	The use of a single unit system reduces implementation complexity, eliminates ambiguity during data exchange, simplifies validation and testing, and improves interoperability between independent AOWIS implementations.		The use of a single unit system reduces implementation complexity, eliminates ambiguity during data exchange, simplifies validation and testing, and improves interoperability between independent AOWIS implementations.

			User Interfaces can show numerical values in non-SI units for convenience, but this is only allowed ''additionally'' to the official SI-unit, and the UI needs to transfer this to the user.

	== Requirements ==		== Requirements ==
			=== General ===

	<pre>		<pre>
	REQ-MEAS-000: The International System of Units (SI) is the authoritative unit system for all physical quantities represented by AOWIS.		REQ-MEAS-000: The International System of Units (SI) is the authoritative unit system for all physical quantities represented by AOWIS.
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	REQ-MEAS-004: Interfaces between AOWIS-compliant and non-AOWIS-compliant systems MUST convert all non-SI physical quantities to SI units before they become part of the AOWIS measurement model and MUST convert from SI units when exporting data to systems requiring non-SI units.		REQ-MEAS-004: Interfaces between AOWIS-compliant and non-AOWIS-compliant systems MUST convert all non-SI physical quantities to SI units before they become part of the AOWIS measurement model and MUST convert from SI units when exporting data to systems requiring non-SI units.

	REQ-MEAS-005: User interfaces MUST clearly indicate the unit associated with every displayed or entered numerical value representing a physical quantity.		REQ-MEAS-005: Each physical quantity in AOWIS MUST be mapped to exactly one canonical SI unit.
			</pre>

			=== User Interface Specific ===
			<pre>
			REQ-MEAS-UI-000: User interfaces MUST clearly indicate the unit associated with every displayed or entered numerical value representing a physical quantity.

			REQ-MEAS-UI-001: User interfaces MAY display measurement values in non-SI units for convenience, but MUST also display the corresponding SI unit value, which is the authoritative representation within AOWIS.

			REQ-MEAS-UI-002: User interfaces MUST clearly indicate that SI-based values are the authoritative representation and that non-SI values are provided for convenience only.

			REQ-MEAS-UI-003: User interfaces accepting non-SI input MUST convert all values to SI units for internal processing and MUST display the SI-converted value as the primary representation after input.

	REQ-MEAS-~~006~~: ~~Each physical quantity in AOWIS~~ MUST be ~~mapped to exactly one canonical SI unit~~.		REQ-MEAS-UI-004: Non-SI input values MAY be retained for traceability purposes but MUST NOT be used for computation, storage, or control logic within AOWIS.
	</pre>		</pre>

Samuel: /* Notes */

2026-06-10T19:29:26Z

Notes

← Older revision		Revision as of 19:29, 10 June 2026
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	== Notes ==		== Notes ==

	~~This specification governs how physical quantities are represented within AOWIS.~~

	External systems MAY use alternative unit systems. Any required conversion between such systems and AOWIS is performed at the system boundary in accordance with REQ-MEAS-004.		External systems MAY use alternative unit systems. Any required conversion between such systems and AOWIS is performed at the system boundary in accordance with REQ-MEAS-004.

Samuel at 19:27, 10 June 2026

2026-06-10T19:27:27Z

← Older revision		Revision as of 19:27, 10 June 2026
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	* Part of: [[Measurement:Main_Page]]		* Part of: [[Measurement:Main_Page]]
	* Related to: [[Measurement:~~UnitStrings~~]]		* Related to: [[Measurement:Unit_Identifiers]]

	AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>		AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>

Samuel at 18:44, 10 June 2026

2026-06-10T18:44:25Z

← Older revision		Revision as of 18:44, 10 June 2026
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	* Part of: [[Measurement:Main_Page]]		* Part of: [[Measurement:Main_Page]]
			* Related to: [[Measurement:UnitStrings]]

	AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>		AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>

Samuel at 18:24, 10 June 2026

2026-06-10T18:24:09Z

← Older revision		Revision as of 18:24, 10 June 2026
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	REQ-MEAS-005: User interfaces MUST clearly indicate the unit associated with every displayed or entered numerical value representing a physical quantity.		REQ-MEAS-005: User interfaces MUST clearly indicate the unit associated with every displayed or entered numerical value representing a physical quantity.

			REQ-MEAS-006: Each physical quantity in AOWIS MUST be mapped to exactly one canonical SI unit.
	</pre>		</pre>

Samuel at 18:13, 10 June 2026

2026-06-10T18:13:01Z

@@ Line 5: / Line 5: @@
 SI is the globally accepted standard for scientific and technical measurement and is defined and maintained by the International Bureau of Weights and Measures (BIPM).<ref name="Wikipedia-SI">Wikipedia — International System of Units https://en.wikipedia.org/wiki/International_System_of_Units</ref>
 == Requirements ==
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 </pre>
+External systems MAY use alternative unit systems. Any required conversion between such systems and AOWIS is performed at the system boundary in accordance with REQ-MEAS-004.
 == References ==
 <references />

Samuel at 18:04, 10 June 2026

2026-06-10T18:04:31Z

← Older revision		Revision as of 18:04, 10 June 2026
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	== Requirements ==		== Requirements ==
	<pre>		<pre>
	REQ-MEAS-001: All AOWIS compliant ~~systems~~ MUST ~~use~~ SI units ~~for (among others) all data models, storage formats, exchanged datasets, configuration files and inter-system mechanisms between AOWIS-compliant systems~~.		REQ-MEAS-000: The International System of Units (SI) is the authoritative unit system for all physical quantities represented by AOWIS.

			REQ-MEAS-001: All numerical values representing physical quantities within an AOWIS-compliant system MUST be represented using SI units.

	REQ-MEAS-002: Implementations MUST produce results that are numerically consistent with SI-based processing.		REQ-MEAS-002: Implementations MUST produce results that are numerically consistent with SI-based processing.

	REQ-MEAS-003: Implementations MUST NOT introduce conversion artifacts, rounding errors, or precision loss that ~~alter~~ the ~~meaning~~ of ~~numerical values~~.		REQ-MEAS-003: Implementations MUST NOT introduce conversion artifacts, rounding errors, or precision loss that are outside the documented precision of the measurement.

	REQ-MEAS-004: ~~Any interfaces to/from~~ non-AOWIS compliant systems ~~need~~ to convert ~~between unit systems before/after sending/receiving numerical values~~ from ~~AOWIS compliant~~ systems.		REQ-MEAS-004: Interfaces between AOWIS-compliant and non-AOWIS-compliant systems MUST convert all non-SI physical quantities to SI units before they become part of the AOWIS measurement model and MUST convert from SI units when exporting data to systems requiring non-SI units.

	REQ-MEAS-005: User interfaces MUST clearly indicate the ~~SI-~~unit associated with every displayed value.		REQ-MEAS-005: User interfaces MUST clearly indicate the unit associated with every displayed or entered numerical value representing a physical quantity.
	</pre>		</pre>

Samuel at 17:47, 10 June 2026

2026-06-10T17:47:12Z

← Older revision		Revision as of 17:47, 10 June 2026
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	SI is the globally accepted standard for scientific and technical measurement and is defined and maintained by the International Bureau of Weights and Measures (BIPM).<ref name="Wikipedia-SI">Wikipedia — International System of Units https://en.wikipedia.org/wiki/International_System_of_Units</ref>		SI is the globally accepted standard for scientific and technical measurement and is defined and maintained by the International Bureau of Weights and Measures (BIPM).<ref name="Wikipedia-SI">Wikipedia — International System of Units https://en.wikipedia.org/wiki/International_System_of_Units</ref>

			== Requirements ==
			<pre>
			REQ-MEAS-001: All AOWIS compliant systems MUST use SI units for (among others) all data models, storage formats, exchanged datasets, configuration files and inter-system mechanisms between AOWIS-compliant systems.

			REQ-MEAS-002: Implementations MUST produce results that are numerically consistent with SI-based processing.

			REQ-MEAS-003: Implementations MUST NOT introduce conversion artifacts, rounding errors, or precision loss that alter the meaning of numerical values.

			REQ-MEAS-004: Any interfaces to/from non-AOWIS compliant systems need to convert between unit systems before/after sending/receiving numerical values from AOWIS compliant systems.

			REQ-MEAS-005: User interfaces MUST clearly indicate the SI-unit associated with every displayed value.
			</pre>








	Non-SI unit systems MAY be used for user input and display purposes, provided that:		Non-SI unit systems MAY be used for user input and display purposes, provided that:

Samuel at 17:25, 10 June 2026

2026-06-10T17:25:27Z

← Older revision		Revision as of 17:25, 10 June 2026
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			* Part of: [[Measurement:Main_Page]]

	AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>		AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>

Samuel: Created page with " AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-unitsNIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units SI is the globally accepted standard for scientific and tec..."

2026-06-10T14:48:29Z

Created page with " AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref> SI is the globally accepted standard for scientific and tec..."

New page

AOWIS systems, components, and data models MUST use the International System of Units (SI) as the canonical unit system.<ref name="BIPM-SI">International Bureau of Weights and Measures (BIPM) — International System of Units (SI) https://www.bipm.org/en/measurement-units/si-base-units</ref><ref name="NIST-SI">NIST — The International System of Units (SI) https://www.nist.gov/pml/owm/metric-si/si-units</ref>

SI is the globally accepted standard for scientific and technical measurement and is defined and maintained by the International Bureau of Weights and Measures (BIPM).<ref name="Wikipedia-SI">Wikipedia — International System of Units https://en.wikipedia.org/wiki/International_System_of_Units</ref>

Non-SI unit systems MAY be used for user input and display purposes, provided that:

* All input values MUST be internally converted to SI units for storage and processing
* The original input unit MUST be preserved as metadata where applicable
* The system MUST clearly indicate the unit associated with every displayed value
* If multiple unit systems are displayed, SI units MUST be clearly identifiable as the primary reference
* Conversion between unit systems MUST be deterministic and consistent across implementations
* User interfaces MAY support alternative unit systems (e.g. imperial units), but SI units remain the authoritative representation within AOWIS.

=== Requirements ===
<pre>
REQ-MEAS-UNIT-010 — All user interfaces MUST display measurement values in SI units as the primary canonical representation.

REQ-MEAS-UNIT-011 — If a user provides input in a non-SI unit (where supported), the system MUST convert the value to SI units for internal processing and display the SI value as the primary result.

REQ-MEAS-UNIT-012 — If a non-SI input unit is provided by the user, the system MUST also display the original user-provided value as secondary information, clearly labeled with its unit and explicitly marked as user-provided input (origin data).

REQ-MEAS-UNIT-013 — The SI-converted value MUST be visually and semantically distinguished as the authoritative representation of the measurement.

REQ-MEAS-UNIT-014 — The original user-provided value MUST NOT be used for calculations, control decisions, or storage without conversion to SI units.

REQ-MEAS-UNIT-015 — Unit ambiguity MUST NOT exist in any displayed measurement; each displayed value MUST have an explicitly stated unit.

* REQ-MEAS-UNIT-001 — All stored measurement values MUST use SI units as the canonical representation.
* REQ-MEAS-UNIT-002 — Non-SI input values MUST be converted to SI units before storage or processing.
* REQ-MEAS-UNIT-003 — The original input unit MUST be preserved as metadata when provided.
* REQ-MEAS-UNIT-004 — Systems MUST ensure that every displayed measurement value has an explicitly defined unit.
* REQ-MEAS-UNIT-005 — SI units MUST be identifiable as the authoritative reference in all multi-unit displays.
* REQ-MEAS-UNIT-006 — Unit conversions MUST be deterministic and consistent across implementations.
* REQ-MEAS-UNIT-007 — UI-only display formats MUST NOT affect stored or transmitted canonical SI values.
</pre>

== References ==

<references />