@prefix iop: <https://w3id.org/iadopt/ont/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ex: <http://example.org/iadopt/HFR> .

ex:RadVelErrHF
    a 
        iop:Variable ;
    rdfs:label 
        "GDOP Geometric dilution of precision " ;
    rdfs:comment 
        """Unitless coefficient characterizing the effect that HFR station geometry has on the measurement and position determination errors. A low GDOP corresponds to an optimal geometric configuration of radar stations, and results in accurate surface current data. Essentially, GDOP is a quantitative way to relate the radial and velocity vector uncertainties. Setting a threshold on GDOP for total combination avoids the combination of radials with an intersection angle below a certain value. GDOP is a useful metric for filtering errant velocities due to poor geometry.""" ;
    iop:hasObjectOfInterest 
        <http://vocab.nerc.ac.uk/collection/S29/current/PE001307/> ;
    iop:hasProperty 
        <https://vocab.nerc.ac.uk/collection/S06/current/S0600265/> .

<http://vocab.nerc.ac.uk/collection/S29/current/PE001307/>
    a 
        iop:Entity ,
        iop:SymmetricSystem ;
    rdfs:label 
        "relative position" ;
    iop:hasPart 
        _:b0 ,
        _:b1 .

<https://vocab.nerc.ac.uk/collection/S06/current/S0600265/>
    a 
        iop:Property ;
    rdfs:label 
        "dilution of precision" .

_:b0
    a 
        iop:Entity ;
    rdfs:label 
        "position of receiver" .

_:b1
    a 
        iop:Entity ;
    rdfs:label 
        "position of transmitters" .