Quantities, Units, Dimensions and Types Ontologies
QUDT Ontologies
The QUDT ontologies provide the following:
- Multiple Systems of Units
- Comprehensive Coverage of Quantities
- Ontology Support for Units Conversion using Dimensions
- Simple and Structured Data Types
The QUDT Ontologies and XML Vocabularies were developed at NASA ARC in the NExIOM project for the NASA Constellation Program. QUDT has a dedicated website at http://www.qudt.org. A table of the QUDT v1.0.0 ontologies, with generated documentation can be accessed at this page.
The following Ontologies are currently in QUDT:
| Schema |
Title |
Details |
| cc |
Creative Commons (in RDF) |
Namespace URI: http://creativecommons.org/ns#
RDF Format: http://creativecommons.org/schema.rdf
Dependencies: none
|
| dc |
Dublin Core |
Namespace URI: http://purl.org/dc/elements/1.1/
Dependencies: none
|
| oecc |
Creative Commons Ontology |
| Description: |
OWL Extensions to the Creative Commons RDF (cc).
|
| Namespace URI: |
http://www.oegov.org/models/common/cc# |
| N3 Format: |
cc.n3 |
| RDF/OWL Format: |
cc |
| Dependencies: |
cc, dc |
|
| qud |
Quantity Unit Dimension Foundation |
| Description: |
The qud, or quantity-unit-dimension ontology defines the base classes properties, and restrictions used for modeling physical quantities, units of measure, and their dimensions in various measurement systems.
|
| Namespace URI: |
http://data.nasa.gov/qudt/owl/qud# |
| N3 Format: |
n1qud.n3 |
| RDF/OWL Format: |
n1qud |
| Dependencies: |
cc, dc, oecc |
|
| quantity |
Base Quantities |
| Description: |
An ontology about physical quantities and the expression of their magnitude in a chosen unit of measure.
|
| Namespace URI: |
http://data.nasa.gov/qudt/owl/quantity# |
| N3 Format: |
n1quantity.n3 |
| RDF/OWL Format: |
n1quantity |
| Dependencies: |
cc, dc, oecc, qud |
|
| dim |
Dimensions |
| Description: |
Dimension systems for physical quantities and units.
|
| Namespace URI: |
http://data.nasa.gov/qudt/owl/dimension# |
| N3 Format: |
n1dimension.n3 |
| RDF/OWL Format: |
n1dimension |
| Dependencies: |
cc, dc, oecc, qud |
|
| unit |
Units |
| Description: |
The Units Ontology is a N1 Ontology that provides a vocabulary for describing units of measure. It also contains a limited set of individual units of measure, specifically, those units that do not have, at the moment, a dedicated N2 level ontology.
|
| Namespace URI: |
http://data.nasa.gov/qudt/owl/unit# |
| N3 Format: |
n1unit.n3 |
| RDF/OWL Format: |
n1unit |
| Dependencies: |
cc, dc, oecc, qud |
|
Unit Datasets
NIST Constants
| Schema |
Title |
Details |
| nist |
NIST Constants |
| Description: |
Defines terms for and contains the values and standard uncertainties of 324 physical constants taken from the NIST website: The NIST Reference on Constants, Units, and Uncertainty, at http://physics.nist.gov/cuu/index.html
|
| Namespace URI: |
http://physics.nist.gov/cuu/ |
| N3 Format: |
nist-constants.n3 |
| RDF/OWL Format: |
nist-constants |
| Dependencies: |
cc, dc, oecc, qud, unit |
|
QUDT and DBPedia
| Schema |
Title |
Details |
| qudt-dbpedia |
QUDT links to DBPedia |
| Description: |
This graph contains 823 links between terms in the QUDT ontology (quantity kinds, units, and physical constants) and their corresponding close and exact matches in DBPedia. The correspondences are stated using the properties skos:closeMatch and skos:exactMatch from the Simple Knowledge Organization System (SKOS) ontology.
|
| Namespace URI: |
http://www.qudt.org/owl/2009/08/qud-dbpedia |
| N3 Format: |
qudt-dbpedia.n3 |
| RDF/OWL Format: |
qudt-dbpedia |
| Dependencies: |
cc, dc, oecc, qud, skos, unit |
|
Last Updated August 27, 2009
This work is licensed under a Creative Commons Attribution-Share Alike 3.0 United States License.
[...] Based on the QUDT Ontologies, we have just released an Ontology of the NIST constants at http://www.oegov.us/blog/?page_id=109#nistConstants. [...]