code: function getFeature(args) {
      var item = args.item,
        params = args.params,
        propFunc = args.propFunc;
  
      var feature = { "type": "Feature" };
  
      feature.geometry = buildGeom(item, params);
      feature.properties = propFunc.call(item);
  
      return feature;
    }
docs: Creates a feature object to be added to the GeoJSON features array