                   lineString,
                        len: lineLength(lineString)
                    });
                });
                list = list.sort(function (a, b) {
                    return b.len - a.len
                });

                var offset = 2000;
                lineTrails = list.slice(0, offset).map(d => {
                    var line = new LineTrail(d.lineString, {
                        chunkLength: d.len / 100,
                        trail: 5,
                        speed: