基于 Leaflet Trackplayer 的高速公路轨迹 WebGIS 可视化

查询结果示例：

{"msg":"ok","location":{"score":71,"level":"区县及以上级行政区划","lon":"113.03667","lat":"28.23593","keyWord":"长沙市马栏山财富广场"},"searchVersion":"7.4.3V","status":"0"}

2、途径重要 AOI 和 POI 信息

使用百度地图获取 AOI 数据，共 7 个兴趣面：

var jdsq = [
  {"name":"月湖公园","children":[{lat:28.237564,lon:113.033027}],"aoi":""},
  {"name":"长沙世界之窗","children":[{lat:28.23595,lon:113.046658}],"aoi":""},
  {"name":"金科公园","children":[{lat:28.231451,lon:113.064211}],"aoi":""},
  {"name":"香槟小镇","children":[{lat:28.235061,lon:113.078557}],"aoi":""},
  {"name":"星沙服务区","children":[{lat:28.240166,lon:113.117113}],"aoi":""},
  {"name":"鸽子湖公园","children":[{lat:28.243757,lon:113.162166}],"aoi":""},
  {"name":"长沙黄花国际机场","children":[{lat:28.211995,lon:113.223308}],"aoi":""}
];

POI 信息示例：

var dataJson = [
  {lat:28.23457,lon:113.035247,p_name:"马栏山"},
  {lat:28.237538,lon:113.043587,p_name:"湖南广播电视局"},
  {lat:28.233681,lon:113.048907,p_name:"湖南省高速公路局"}
];

3、高速区间道路信息

调用天地图驾车接口查询路径规划：

@Test public void xml2JavaBean() { 
    String origInfo = "113.03667,28.23593";
    String destInfo = "113.285187,28.209144";
    String postStr = "%7B'orig':'" + origInfo + "','dest':'" + destInfo + "','style':'1'%7D" ; 
    HttpResponse<String> resp = tdtOptService.drivePlan(postStr,"search",TDT_SERVER_KEY);
    // ... 解析逻辑 ...
}

三、leaflet-trackplayer 实战

Leaflet 是轻量级开源 JavaScript 地图库，Trackplayer 是其扩展插件，用于展示轨迹数据。

1、行驶道路生成和设置

将规划路线转为线坐标：

var routelatlonArray = new Array(); 
var routelatlonTarget = routelatlon.split(";"); 
for(var i=0;i < routelatlonTarget.length;i++){ 
    var routelatlonVal = routelatlonTarget[i]; 
    if("" != routelatlonVal){ 
        var _tempVal = routelatlonVal.split(","); 
        routelatlonArray.push({lat:_tempVal[1],lng:_tempVal[0]}); 
    } 
} 
const path = routelatlonArray; 
map.fitBounds(path);

绑定组件：

let track = new L.TrackPlayer(path, { 
    markerIcon: L.icon({ 
        iconSize: [27, 54], 
        iconUrl: "./lib/assets/bus_online.png", 
        iconAnchor: [13.5, 27], 
    }), 
    speed: 800, 
}); 
track.addTo(map);

2、途径重要 AOI 和 POI

标注 AOI 方法：

for(var i=0;i<jdsq.length;i++){ 
    for(var j = 0;j<jdsq[i].children.length;j++){ 
        var tempInfo = jdsq[i].children; 
        var marker = L.marker([tempInfo[j].lat, tempInfo[j].lon], { 
            icon: L.divIcon({ 
                iconSize: null, 
                className: '', 
                popupAnchor:[5,5], 
                shadowAnchor:[5,5], 
                html: buildHtml(jdsq[i].name) 
            }) 
        }).addTo(collisionLayer); 
    } 
    L.polygon([ convertStr2DataArrayTrans(jdsq[i].aoi) ],style).addTo(map); 
}

3、车辆车牌信息模拟跟随

定义车牌 Marker：

var carNo = "湘 A32MH6/张三"; 
var sourceMarker = L.marker([28.235638, 113.036629], { 
    icon: L.divIcon({ 
        iconSize: null, 
        className: '', 
        popupAnchor:[5,5], 
        shadowAnchor:[5,5], 
        html: "<div animation-spaceInDown><div>"+carNo +"</div></div>" 
    }) 
}).addTo(map);

监听变化更新位置：

track.on("progress", (progress, { lng, lat },index) => { 
    control.carLatLng = `${lng},${lat}`; 
    sourceMarker.setLatLng([lat, lng]); 
    control.progress = progress * 100; 
    control.status = "行驶中"; 
});

4、成果展示

车辆从马栏山出发，经过星沙服务区、途径长沙黄花机场，最终到达永安收费站。

四、总结

本文详细介绍了高速公路轨迹的 WebGIS 可视化呈现，围绕长永高速轨迹可视化进行基础数据准备处理，最后基于 leaflet-trackplayer 进行了代码功能研发，成功实现免费高速的道路可视化。