use the MapBox simplestyle
            //method, because that only supports line/poly data and doesn't take
            //marker styles into account at all
            if(feature.geometry.type == "Point") {
                var radius = 4;
                
                if(feature.properties["marker-size"] !== undefined) {
                    if(feature.properties["marker-size"] == "small") {
                        radius = 2;
                    }
                    else if(feature.properties["marker-si