The QUDT Ontologies, and derived XML Vocabularies, are being developed by TopQuadrant and NASA. Originally, they were developed for the NASA Exploration Initiatives Ontology Models (NExIOM) project, a Constellation Program initiative at the AMES Research Center (ARC). The goals of the QUDT ontology are twofold:
- to provide a unified model of, measurable quantities, units for measuring different kinds of quantities, the numerical values of quantities in different units of measure and the data structures and data types used to store and manipulate these objects in software;
- to populate the model with the instance data (quantities, units, quantity values, etc.) required to meet the life-cycle needs of the Constellation Program engineering community.
If you are looking for measurements, this would be one place to start.