I am completing the setup of a database in which I will test Stardog geospatial support. I have assembled some real estate property sales data and created Geometry resources for earch Property.
I now want to calculate the distance between two properties and I need to use the geof:distance function and indicate the desired unit (Mile, KM, Yard, ...). However, I am not able to find the unit ontology (http://qudt.org/vocab/unit). Any clue where I can download it?
I have already loaded in my database the following geospatial ontologies: