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          "entityType" : "Identifier",
          "authority" : {
            "entityType" : "Citation",
            "title" : "EPSG Geodetic Parameter Dataset"
          },
          "code" : "7030",
          "codeSpace" : "EPSG",
          "version" : "12.026"
        } ],
        "alias" : [ "WGS84" ],
        "remarks" : "1/f derived from four defining parameters semi-major axis; C20 = -484.16685*10e-6; earth's angular velocity ω = 7292115e-11 rad/sec; gravitational constant GM = 3986005e8 m*m*m/s/s. In 1994 new GM = 3986004.418e8 m*m*m/s/s but a and 1/f retained.",
        "semiMajorAxis" : {
          "value" : 6378137.0,
          "uom" : "m"
        },
        "secondDefiningParameter" : {
          "inverseFlattening" : {
            "value" : 298.257223563
          },
          "isSphere" : false
        }
      }
    } ],
    "ensembleAccuracy" : {
      "entityType" : "PositionalAccuracy",
      "nameOfMeasure" : [ "Ensemble accuracy" ],
      "evaluationMethodType" : "directExternal",
      "evaluationMethodDescription" : "Accuracy declared in a geodetic dataset.",
      "result" : [ {
        "entityType" : "QuantitativeResult",
        "value" : {
          "value" : 2.0,
          "uom" : "m"
        }
      } ]
    }
  }
}