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Analysis
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Dynamic Layers
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Graphics
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Description
The HeatmapRenderer creates a surface using a standard Gaussian blur algorithm used in data visualization for illustrating areas of concentration within datasets. (Added at version 3.11 of the JS API)Code
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<title>FeatureLayer using HeatmapRenderer</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.26/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.26/esri/css/esri.css">
<style>
html, body, #map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
</style>
<script src="https://js.arcgis.com/3.26/"></script>
<script>
var map;
require([
"esri/InfoTemplate",
"esri/layers/FeatureLayer",
"esri/map",
"esri/renderers/HeatmapRenderer",
"dojo/domReady!"
],
function (InfoTemplate, FeatureLayer, Map, HeatmapRenderer){
// --------------------------------------------------------------------
// Formatting functions for attribute values in the InfoWindow
// Data is not what you expect, turn your dirty data into
// readable stuff in the infowindow
// --------------------------------------------------------------------
formatFatalities = function (value, key, data){
var result = value > 1 ? value + " people " : value + " person ";
return result;
}
formatGender = function (value, key, data){
var lookup = {1: "male", 2: "female", 8: "unknown", 9: "unknown"};
return lookup[value];
}
formatConditions = function (value, key, data){
var lookup = {0: "No Additional Atmospheric Conditions", 1: "Clear", 2: "Rain", 3: "Sleet, Hail (Freezing Rain or Drizzle)", 4: "Snow", 5: "Fog, Smog, Smoke", 6: "Severe Crosswinds", 7: "Blowing Sand, Soil, Dirt", 8: "Other", 10: "Cloudy", 11: "Blowing Snow", 98: "Not Reported", 99: "Unknown"};
if (value !== 1) {
return "Road conditions: " + lookup[value] + "<br>";
}
}
formatWorkZone = function (value, key, data){
var lookup = {0: "None", 1: "Construction", 2: "Maintenance", 3: "Utility", 4: "Work Zone, Type Unknown"};
if (value !== 0) {
return "Work Zone: " + lookup[value] + "<br>";
}
}
formatAlcoholTestResults = function (value, key, data){
// --------------------------------------------------------------------
// The field is a string and we only want values of 8 - 94 since the
// California legal limit is 0.08% BAC. If value is between 8 and 94
// then we will report that they were over the legal limit.
// --------------------------------------------------------------------
var isMatch = value.match(/\b(?!9[5-9])[0-9][0-9]\b|\b[8-9]{1}\b/m);
if (isMatch) {
return "Driver was over the legal limit for alcohol";
}
}
map = new Map("map", {
basemap: "gray",
center: [-119.11, 36.65],
zoom: 7,
minZoom: 7,
maxZoom: 9
});
var infoContentDesc = "<p>${numfatal:formatFatalities} died when a ${age} year old ${sex:formatGender} was involved in a fatal speeding accident.</p>";
var infoContentDetails = "${atmcond:formatConditions}${conszone:formatWorkZone}${alcres:formatAlcoholTestResults}";
var infoContent = infoContentDesc + infoContentDetails;
var infoTemplate = new InfoTemplate("Accident details", infoContent);
var serviceURL = "//services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/2012_CA_NHTSA/FeatureServer/0";
var heatmapFeatureLayerOptions = {
mode: FeatureLayer.MODE_SNAPSHOT,
infoTemplate: infoTemplate,
outFields: [
"atmcond",
"numfatal",
"conszone",
"age",
"alcres",
"sex"
]
};
var heatmapFeatureLayer = new FeatureLayer(serviceURL, heatmapFeatureLayerOptions);
var heatmapRenderer = new HeatmapRenderer();
heatmapFeatureLayer.setRenderer(heatmapRenderer);
map.addLayer(heatmapFeatureLayer);
});
</script>
</head>
<body>
<div id="map"></div>
</body>
</html>