require([ "esri/Map", "esri/layers/CSVLayer", "esri/views/MapView", "esri/widgets/Legend" ], (Map, CSVLayer, MapView, Legend) => { const url = "https://earthquake.usgs.gov/fdsnws/event/1/query.csv?starttime=2020-01-01%2000:00:00&endtime=2020-12-31%2023:59:59&minlatitude=28.032&maxlatitude=41.509&minlongitude=74.18&maxlongitude=115.857&minmagnitude=2.5&orderby=time"; // Paste the url into a browser's address bar to download and view the attributes // in the CSV file. These attributes include: // * mag - magnitude // * type - earthquake or other event such as nuclear test // * place - location of the event // * time - the time of the event const template = { title: "{place}", content: "Magnitude {mag} {type} hit {place} on {time}." }; // The heatmap renderer assigns each pixel in the view with // an intensity value. The ratio of that intensity value // to the maxPixel intensity is used to assign a color // from the continuous color ramp in the colorStops property const renderer = { type: "heatmap", colorStops: [ { color: "rgba(63, 40, 102, 0)", ratio: 0 }, { color: "#472b77", ratio: 0.083 }, { color: "#4e2d87", ratio: 0.166 }, { color: "#563098", ratio: 0.249 }, { color: "#5d32a8", ratio: 0.332 }, { color: "#6735be", ratio: 0.415 }, { color: "#7139d4", ratio: 0.498 }, { color: "#7b3ce9", ratio: 0.581 }, { color: "#853fff", ratio: 0.664 }, { color: "#a46fbf", ratio: 0.747 }, { color: "#c29f80", ratio: 0.83 }, { color: "#e0cf40", ratio: 0.913 }, { color: "#ffff00", ratio: 1 } ], maxDensity: 0.01, minDensity: 0 }; const layer = new CSVLayer({ url: url, title: "Magnitude 2.5+ earthquakes from the last week", copyright: "USGS Earthquakes", popupTemplate: template, renderer: renderer, labelsVisible: true, labelingInfo: [ { symbol: { type: "text", // autocasts as new TextSymbol() color: "white", font: { family: "Noto Sans", size: 8 }, haloColor: "#472b77", haloSize: 0.75 }, labelPlacement: "center-center", labelExpressionInfo: { expression: "Text($feature.mag, '#.0')" }, where: "mag > 5" } ] }); const map = new Map({ basemap: "gray-vector", layers: [layer] }); const view = new MapView({ container: "viewDiv", center: [-138, 30], zoom: 2, map: map }); view.ui.add( new Legend({ view: view }), "bottom-left" ); }); </script>怎么把这段代码中引用的地址改成本地内存的地址
本文总结了一周内算法竞赛的复习计划，涵盖了多项式运算、数据结构、图论、网络流、计算几何、数论等核心算法知识点。作者分享了每一天的学习重点，包括LCT、可持久化数据结构、2-sat、圆方树、数位DP、SA、manacher、扫描线、半平面交、闵可夫斯基和、Polya、Mobius、欧拉定理等高级算法概念。
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