Area of spatial objects

Dear SDWIG,

I am working on a series of Australian national spatial datasets published as Linked Data using the general pattern of GeoSPARQL with Features with Geometries. I’d like to indicate area for the Features and am doing so like this:

<feature_x>
    ex:hasArea [
        qudt:numericValue “12345678”^^xsd:decimal ;
        qudt:unit qudt:SquareMeter ;
   ] ;
] ;

Some questions for this IG:


  1.  Does anyone know of a general object property I can use for ex:hasArea with the Domain a Feature?
     *   I don’t want to have to declare :has Area in each of the several ontologies we are using or invent an areas ontology if I can avoid it
  2.  Can anyone advise on how to separate a “normal” area value from an Albers Area, other than doing this:

<feature_x>
   ex:hasArea […] ;
    ex:hasAlbersArea […] ;
] ;


     *   Do people suggest using ex:hasArea twice and then, within the area blank node, using another property or subclassing (of what though?) to indicate area v. Albers Area

Any comments would be helpful,

Thanks,

Nick