getModelScale() {
        return this.modelOrigin.meterInMercatorCoordinateUnits();
    }
Returns the scale to transform into MercatorCoordinate from coordinates in
real world units using meters. This provides the distance of 1 meter in
MercatorCoordinate units at the initial centerpoint of the map.
@returns {number} The scale to transform into MercatorCoordinate from
    coordinates in real world units using meters