ArcGIS之热力图显示：实现方法

1、 graphicLayer5 是你 要生成 热力图 的图层，循环图层将点，

      加上属性  {"FID": r , "value": 1}  重新赋值 给 features 新数组

var features = [];for (var r = 0; r < graphicLayer5.graphics.length; r++) {     var point = graphicLayer5.graphics[r].geometry;     var graphic = new esri.Graphic(point);     graphic.setAttributes({"FID": r, "value": 1});     features.push(graphic);}

2、将 features 重新 赋值 给   featureSet.features  即可

var featureSet = new esri.tasks.FeatureSet();featureSet.features = features;featureSet.geometryType = 'esriGeometryPoint';featureSet.fieldAliases = {	"FID": "FID",	"value": "value"};featureSet.spatialReference = new esri.SpatialReference({wkid: 4326});var layerDefinition = {	"objectIdField": "FID",	"geometryType": "esriGeometryPoint",	"fields": [		{			"name": "FID",			"type": "esriFieldTypeOID",			"alias": "FID",			"sqlType": "sqlTypeOther"		},		{			"name": "value",			"type": "esriFieldTypeInteger",			"alias": "value"		}	]}var featureCollection = {	layerDefinition: layerDefinition,	featureSet: featureSet};var heatmapRenderer = new HeatmapRenderer({	field: "value",	colors:["rgba(0,0,0,0)","rgb(221,255,0)","rgb(255,208,0)","rgb(255,120,0)","rgb(249,6,0)","rgb(181,0,0)"],	// blurRadius: 15,	// maxPixelIntensity: 1,	// minPixelIntensity: 0}); if(hotmapLayer){	 map.removeLayer(hotmapLayer); } hotmapLayer = new FeatureLayer(featureCollection, {	 mode: FeatureLayer.MODE_AUTO,	 outFields: ["value"], }); hotmapLayer.setRenderer(heatmapRenderer); map.addLayer(hotmapLayer);

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