leaflet-velocity风场粒子效果及数据处理
一，后台给到的数据
{"msg": "success","code": 200,"data": {"startLat": 39.3,"endlat": 41.2,"latdel": 0.099999994,"startLon": 115.3,"endLon": 117.50001,"values": "","londel": 0.099999994,"vs": [[-0.06, -0.09, -0.16, -0.15, 0.15, 0.99, 1.6, 1.95, 2.15, 2.3, 2.45, 2.65, 2.79, 2.77, 2.68, 2.71, 2.71, 2.48, 2.2, 2.09, 2.28, 2.61, 2.69],[-0.3, 0.1, 0.35, 0.13, 0.01, 0.28, 0.86, 1.54, 2.05, 2.27, 2.44, 2.56, 2.65, 2.7, 2.62, 2.64, 2.59, 2.41, 2.25, 2.25, 2.4, 2.54, 2.59],[-0.42, 0.03, 0.26, 0.06, 0.08, 0.11, 0.19, 0.91, 1.49, 2.05, 2.37, 2.43, 2.52, 2.54, 2.52, 2.35, 2.23, 2.1, 2.06, 2.11, 2.16, 2.2, 2.37],[-0.03, -0.12, -0.35, -0.29, 0.31, 0.38, 0.3, 0.44, 1, 1.8, 2.18, 2.33, 2.39, 2.44, 2.36, 2.33, 2.32, 2.3, 2.2, 2.08, 1.99, 1.89, 1.89],[0.05, -0.16, -0.33, 0.18, 0.76, 0.82, 0.36, -0.01, 0.44, 0.98, 1.47, 1.86, 1.99, 2.12, 2.18, 2.26, 2.34, 2.26, 1.95, 1.73, 1.72, 1.76, 1.6],[-0.34, -0.28, 0.2, 0.99, 1.46, 1.05, 0.39, 0.02, 0.06, 0.27, 0.62, 1.08, 1.48, 1.8, 1.97, 1.97, 1.91, 1.58, 1.07, 0.68, 0.77, 0.99, 1.09],[0, 0.1, 0.64, 1.47, 1.13, 0.57, 0.16, 0.03, 0.03, 0.18, 0.36, 0.69, 1.17, 1.51, 1.73, 1.87, 1.88, 1.67, 1.09, 0.48, 0.03, -0.18, -0.1],[1.27, 1.4, 1.58, 1.26, 0.34, -0.21, -0.43, -0.35, -0.39, -0.34, -0.01, 0.36, 0.68, 0.93, 1.36, 1.85, 2.07, 2.01, 1.64, 1.04, 0.2, -0.56, -0.84],[1.88, 1.97, 1.75, 1.11, 0.61, 0.29, -0.06, -0.48, -0.9, -0.85, -0.4, 0.01, 0.27, 0.53, 1.2, 1.66, 1.74, 1.49, 1.11, 0.79, 0.43, 0.03, -0.38],[0.27, 0.34, 0.39, 0.56, 1.01, 1.29, 1.02, 0.25, -0.32, -0.53, -0.62, -0.48, -0.37, 0.02, 0.81, 1.65, 2.13, 1.73, 1.26, 0.75, 0.44, 0.59, 0.51],[-0.46, -0.51, -0.52, -0.33, 0.04, 0.43, 0.57, 0.56, 0.49, 0.21, -0.42, -0.77, -0.83, -0.35, 0.32, 1.42, 2.43, 3.01, 2.98, 1.95, 1.23, 1.21, 1.56],[0.26, 0.17, -0.1, -0.46, -0.7, -0.8, -0.56, 0.09, 0.67, 0.67, 0.39, 0.12, 0.09, 0.42, 0.62, 0.9, 1.39, 2.38, 2.96, 2.94, 2.63, 2.32, 2.63],[0.95, 0.98, 0.85, 0.58, 0.27, 0.01, -0.07, 0.24, 0.6, 0.89, 1.35, 1.62, 1.88, 2.03, 1.72, 1.04, 0.47, 0.48, 1.07, 2.58, 3.57, 3.57, 3.19],[0.41, 0.43, 0.67, 1.04, 1.25, 1.2, 0.97, 0.72, 0.67, 0.93, 1.44, 1.94, 2.24, 2.25, 2.21, 1.98, 1.42, 0.57, 0.63, 1.88, 3.13, 3.66, 2.96],[0.05, -0.07, 0.04, 0.27, 0.42, 0.49, 0.66, 0.79, 0.9, 1.01, 0.89, 0.73, 0.52, 0.52, 1.08, 2.36, 3.19, 2.61, 1.88, 1.55, 2.31, 2.98, 2.81],[1.28, 1.04, 0.78, 0.43, 0.06, -0.02, 0.25, 0.71, 1.12, 1.05, 0.64, 0.31, 0.09, 0.01, 0.55, 1.9, 2.95, 3.04, 1.88, 1.56, 2.41, 3.34, 3.5],[3.14, 2.97, 2.03, 1.23, 0.81, 0.74, 0.65, 0.66, 0.89, 0.81, 0.73, 0.88, 1.22, 1.28, 1.35, 1.65, 2.42, 2.53, 2.07, 2.35, 3.21, 4.01, 2.9],[3.15, 3.14, 1.91, 1.03, 0.92, 1.15, 0.81, 0.53, 0.43, 0.61, 0.95, 1.63, 2.27, 2.45, 2.09, 2.13, 2.72, 3.24, 3.66, 3.61, 3.67, 2.97, 0.92],[2.75, 2.49, 1.43, 0.25, 0.32, 0.53, 0.52, 0.38, 0.46, 0.95, 1.44, 1.92, 2.33, 2.29, 2.1, 2.27, 2.91, 4.1, 4.64, 4.46, 3.7, 2.54, 1.01],[4.16, 3.52, 2.04, 0.95, 0.68, 0.82, 0.83, 0.83, 1.09, 1.44, 1.63, 1.8, 1.91, 1.89, 1.68, 1.53, 2.1, 3.07, 3.91, 4.36, 4.11, 3.61, 3.22]],"us": [[-0.04, 0.13, 0.21, 0.17, 0.08, 0, -0.12, -0.19, -0.21, -0.12, -0.1, -0.33, -0.43, -0.51, -0.58, -0.65, -0.54, -0.34, -0.36, -0.54, -0.52, -0.33, -0.23],[-0.3, -0.41, -0.4, -0.32, -0.1, 0.19, 0.29, 0.09, -0.24, -0.23, -0.24, -0.33, -0.49, -0.61, -0.64, -0.63, -0.55, -0.48, -0.59, -0.72, -0.63, -0.48, -0.36],[-0.1, -0.14, -0.2, -0.2, -0.18, 0.02, 0.38, 0.22, -0.15, -0.37, -0.44, -0.41, -0.43, -0.44, -0.53, -0.61, -0.66, -0.71, -0.81, -0.83, -0.8, -0.74, -0.62],[0.12, 0.41, 0.65, 0.56, 0.12, 0.1, 0.19, 0.19, 0.08, -0.09, -0.28, -0.38, -0.46, -0.53, -0.62, -0.73, -0.84, -0.94, -1, -0.97, -0.99, -0.99, -0.93],[-0.2, 0.16, 0.57, 0.64, 0.54, 0.24, -0.07, -0.16, -0.02, 0.11, 0.02, -0.33, -0.6, -0.76, -0.83, -0.89, -0.99, -1.16, -1.25, -1.21, -1.14, -1.09, -1.07],[-0.32, 0.13, 0.59, 0.93, 0.86, 0.21, -0.35, -0.59, -0.42, -0.1, -0.03, -0.26, -0.49, -0.66, -0.92, -1.12, -1.32, -1.57, -1.75, -1.69, -1.47, -1.3, -1.25],[0.25, 0.86, 1.37, 1.45, 0.67, -0.11, -0.55, -0.6, -0.37, -0.1, -0.08, -0.2, -0.32, -0.54, -1.04, -1.51, -1.93, -2.28, -2.53, -2.51, -2.19, -1.79, -1.58],[0.33, 1, 1.39, 0.82, -0.25, -0.76, -0.64, -0.44, -0.22, -0.11, -0.14, -0.42, -0.64, -0.89, -1.19, -1.63, -2.06, -2.42, -2.74, -2.81, -2.55, -2.08, -1.79],[-0.05, 0.17, 0.41, -0.01, -0.71, -0.81, -0.64, -0.44, -0.42, -0.52, -0.71, -1.01, -1.28, -1.4, -1.46, -1.69, -1.98, -2.29, -2.49, -2.46, -2.18, -1.85, -1.55],[-0.17, -0.04, 0.02, -0.36, -0.82, -0.84, -0.53, -0.59, -0.92, -1.19, -1.31, -1.31, -1.35, -1.32, -1.32, -1.57, -2.13, -2.37, -2.22, -1.77, -1.45, -1.31, -1.11],[-0.04, -0.02, -0.39, -1.11, -1.71, -1.65, -1.3, -1.15, -1.2, -1.28, -1.35, -1.36, -1.25, -0.87, -0.38, -0.5, -1.07, -1.58, -1.71, -1.48, -1.13, -0.8, -0.32],[-0.15, -0.4, -1.03, -1.74, -2.15, -2.18, -1.91, -1.44, -1.17, -1.12, -1.19, -1.19, -1.02, -0.34, 0.36, 0.84, 0.93, 0.39, -0.42, -1.11, -1.22, -0.32, 0.91],[-0.38, -0.58, -0.66, -0.65, -0.62, -0.81, -0.94, -0.87, -0.82, -0.87, -0.89, -0.81, -0.58, -0.06, 0.4, 1.05, 1.61, 1.7, 1.14, -0.06, -0.81, 0.21, 1.51],[-0.21, 0.04, 0.24, 0.4, 0.46, 0.26, -0.04, -0.36, -0.48, -0.49, -0.32, -0.05, 0.16, -0.01, -0.24, 0.16, 1.07, 2.12, 2.14, 1.17, 0.48, 0.57, 1.63],[0.13, 0.74, 0.76, 0.35, -0.28, -0.54, -0.42, -0.39, -0.35, -0.21, 0, 0.11, 0.12, -0.14, -0.27, -0.24, 0.5, 1.46, 1.41, 1.08, 0.91, 1.18, 1.75],[0.44, 1.42, 1.38, 0.46, -0.72, -1.06, -0.86, -0.59, -0.42, -0.2, -0.06, -0.09, -0.14, -0.08, 0.4, 0.81, 0.91, 0.55, 0.07, 0.56, 1.47, 2.26, 2.43],[0.91, 1.89, 1.87, 0.47, -0.67, -0.96, -0.89, -0.87, -0.8, -0.33, 0.27, 0.55, 0.28, 0.31, 0.79, 1.33, 1.33, 0.37, 0.09, 1.08, 2.51, 3.08, 2.07],[1.61, 2.25, 1.1, -0.59, -1.69, -1.4, -1.1, -1.13, -1.02, -0.14, 1.25, 1.59, 1.18, 0.55, 0.4, 0.76, 0.67, 0.38, 0.65, 1.91, 2.77, 2.29, 0.61],[2.23, 2.23, 0.57, -1.79, -2.73, -1.73, -1.01, -0.81, -0.68, 0.67, 1.72, 1.79, 0.93, 0.02, -0.25, -0.21, 0.08, 0.48, 1.28, 1.99, 2.09, 1.53, 0.4],[2.38, 2.48, 0.15, -1.91, -2.27, -1.08, -0.41, -0.29, 0.33, 1.64, 2, 0.97, -0.17, -0.78, -0.82, -0.69, -0.1, 0.75, 1.6, 1.82, 1.8, 1.71, 1.59]]}
}二，leaflet-velocity 所需要的数据
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{"parameterUnit": "m.s-1","parameterNumber": 3,"dx": 1.0,"dy": 1.0,"parameterNumberName": "northward_wind","la1": -7.5,"la2": -28.5,"parameterCategory": 2,"lo2": 156.0,"nx": 14,"ny": 22,"refTime": "2017-02-01 23:00:00","lo1": 143.0},"data": 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]三，处理函数
function generateLeafletVelocityData (us, vs, startLat, endLat, latdel, startLon, endLon, londel) {const ny = us.lengthconst nx = us[0].lengthconst refTime = "2025-05-08 00:00:00" // 可动态生成// leaflet-velocity 要求纬度从北到南const latOrder = startLat < endLat? [...Array(ny).keys()].reverse() // 从最大纬度向最小纬度: [...Array(ny).keys()] // 从南到北function flatten (data) {const flat = []for (let j of latOrder) {for (let i = 0; i < nx; i++) {flat.push(data[j][i])}}return flat}const headerBase = {nx,ny,lo1: startLon,la1: Math.max(startLat, endLat),lo2: endLon,la2: Math.min(startLat, endLat),dx: londel,dy: latdel,refTime,parameterUnit: "m.s-1",}const uField = {header: {...headerBase,parameterCategory: 2,parameterNumber: 2,parameterNumberName: "Eastward wind"},data: flatten(us)}const vField = {header: {...headerBase,parameterCategory: 2,parameterNumber: 3,parameterNumberName: "Northward wind"},data: flatten(vs)}return [uField, vField]}四，案例使用
// 打开一个GET请求xhr.open("GET", url, true)// 设置请求完成的处理函数xhr.onload = function () {if (xhr.status == 200) {// 请求成功var json = JSON.parse(xhr.responseText).dataconsole.log(json, 'data')let { us, vs, startLat, endlat, latdel, startLon, endLon, londel } = { ...json }const windData = generateLeafletVelocityData(us, vs, startLat, endlat, latdel, startLon, endLon, londel)var velocityLayer = L.velocityLayer({displayValues: true,displayOptions: {velocityType: "GBR Wind",position: "bottomleft",emptyString: "No wind data",showCardinal: true},data: windData,maxVelocity: 10})// 4. 添加到地图上velocityLayer.addTo(map)} else {// 请求失败console.error("请求失败，状态码：" + xhr.status)}}// 发送请求xhr.send()五，案例效果
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