arcgis点密度专题

最新推荐文章于 2025-05-18 12:59:50 发布

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最新推荐文章于 2025-05-18 12:59:50 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/Jeely/p/11175152.html

该博客主要围绕ArcGIS点密度专题展开，通过代码展示了如何创建地图、添加基础地图服务和要素图层，设置点密度渲染器以呈现人口分布（2007年），还添加了图例。代码中使用了ArcGIS相关的库和方法实现这些功能。

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>点密度专题</title>
    <link rel="stylesheet" href="http://js.arcgis.com/3.9/js/esri/css/esri.css">
    <style>
        html, body, #map {
            height: 100%;
            margin: 0;
        }
        #info {
            position: absolute;
            right: 0;
            top: 0;
            font: 14px sans-serif;
            background: #fff;
            width: 160px;
            text-align: center;
            border-radius: 0 0 0 10px;
        }
    </style>
    <script src="http://js.arcgis.com/3.9/"></script>
    <script>
        var map;
        require(["esri/map", "esri/layers/ArcGISTiledMapServiceLayer", "esri/layers/FeatureLayer",
          "esri/InfoTemplate", "esri/renderers/DotDensityRenderer", "esri/symbols/SimpleLineSymbol", "esri/dijit/Legend",
          "esri/Color", "dojo/domReady!"
        ], function (Map, ArcGISTiledMapServiceLayer, FeatureLayer,
          InfoTemplate, DotDensityRenderer, SimpleLineSymbol, Legend, Color
        ) {
            map = new Map("map");

            var baseMapUrl = "http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer";
            var baseMap = new ArcGISTiledMapServiceLayer(baseMapUrl);
            map.addLayer(baseMap);

            var layerUrl = "http://services.arcgis.com/BG6nSlhZSAWtExvp/ArcGIS/rest/services/Demographics_World_Simp/FeatureServer/0";
            var layer = new FeatureLayer(layerUrl, {
                infoTemplate: new InfoTemplate("${CNTRY_NAME}", "${*}"),
                mode: FeatureLayer.MODE_ONDEMAND,
                outFields: ["*"]
            });

            var renderer = new DotDensityRenderer({
                backgroundColor: new Color("#FFFFFF"),
                outline: new SimpleLineSymbol().setColor(new Color([0,0,255])),
                fields: [{
                    name: "POP2007",
                    color: new Color("#FF0000")
                }],
                dotShape: "circle",
                dotValue: 1000000,
                dotSize: 1
            });
            layer.setRenderer(renderer);
            map.addLayers([layer]);

            map.on("layers-add-result", function (e) {
                var corn = e.layers[0].layer;
                var legend = new Legend({
                    map: map,
                    layerInfos: [{
                        layer: corn,
                        title: "人口分布（2007年）"
                    }]
                }, "legend");
                legend.startup();
            });
        });
    </script>
</head>
<body>
    <div id="map"></div>
    <div id="info">
      <div id="legend"></div>
    </div>
</body>
</html>