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dcopendata_income_choropleth_arcgis.html
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<!DOCTYPE html>
<html>
<head>
<!-- Description: This sample demonstrates how to create a colorful interactive choropleth map of census tracts using data from DC Open Data with the help of Esri ArcGIS JS API -->
<!-- Attribution:
Esri ArcGIS JS API Samples, Url: https://developers.arcgis.com/javascript/3/jssamples/fl_hover.html
Styling inspired by Esri Story Map: https://storymaps.esri.com/stories/2016/top-stories/
-->
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<title>Census Tracts by Median Income - 2010 @ Washington, DC</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.19/dijit/themes/tundra/tundra.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.19/esri/css/esri.css">
<link rel="shortcut icon" type="image/x-icon" href="https://dc.gov/sites/default/files/favicon_0.ico">
<style>
body {
margin: 0;
padding: 0;
font-family: "open_sanssemi", sans-serif;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
a {
color: #fff;
font-family: 'open_sansregular', sans-serif;
}
.esriSimpleSliderTL {
top: 100px;
}
#info {
position: absolute;
left: 0;
bottom: 0;
padding: 10px;
background-color: rgba(73, 73, 73, 0.8);
font-size: 14px;
font-family: "open_sanssemibold", sans-serif;
width: 200px;
text-align: center;
border-radius: 0 10px 0 0;
color: white;
}
</style>
<style>
/*styling for title bar and about pop over */
#title {
color: #fff;
font-family: "open_sanssemibold", sans-serif;
padding: 3 0 0 4;
font-size: 24px;
line-height: 30px;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.header {
position: relative;
padding: 15px 30px 25px 30px;
margin: auto;
z-index: 500;
background-color: rgb(12, 12, 12);
box-shadow: 0 3px 5px 0 rgba(0, 0, 0, .75);
opacity: 0.8;
}
#about {
padding: 10px 20px 20px 20px;
z-index: 4000;
position: absolute;
background-color: #505050;
color: white;
width: 700px;
left: 50%;
margin-left: -300px;
height: calc(100% - 200px);
top: 100px;
display: none;
overflow: hidden;
opacity: 0.95;
}
#dismiss-about {
cursor: pointer;
font-size: 30px;
float: right;
margin-bottom: 10px;
}
#inner {
width: 100%;
height: calc(100% - 60px);
overflow-y: auto;
-webkit-overflow-scrolling: touch;
}
</style>
<script src="https://js.arcgis.com/3.19/"></script>
<!-- Load the main Terraformer Core library for transforming GeoJSON -->
<script src="https://esri.github.io/geojson-layer-js/vendor/terraformer/terraformer.min.js"></script>
<!-- Load Terraformer ArcGIS Parser plugin library, which handles two way conversion between GeoJson and the ArcGIS Geometry format used by esri -->
<script src="https://esri.github.io/geojson-layer-js/vendor/terraformer-arcgis-parser/terraformer-arcgis-parser.min.js"></script>
<script>
var map;
//Data source from DC Open Data
var censusGeoJsonUrl = "https://opendata.arcgis.com/datasets/6969dd63c5cb4d6aa32f15effb8311f3_8.geojson";
require([
"esri/map", "esri/layers/FeatureLayer",
"esri/dijit/InfoWindow", "esri/InfoTemplate",
"esri/symbols/SimpleFillSymbol", "esri/renderers/SimpleRenderer",
"https://esri.github.io/geojson-layer-js/src/geojsonlayer.js",
"esri/symbols/SimpleLineSymbol",
"esri/Color", "esri/lang", "esri/graphic", "dojo/dom-style",
"esri/dijit/Legend",
"esri/renderers/ClassBreaksRenderer",
"dijit/TooltipDialog", "dijit/popup",
"dojo/dom-construct", "dojo/dom-class",
"dojo/number", "dojo/dom-attr", "dojo/on", "dojo/dom", "dojo/domReady!"
], function(
Map, FeatureLayer,
InfoWindow, InfoTemplate,
SimpleFillSymbol, SimpleRenderer,
GeoJsonLayer, SimpleLineSymbol, Color, esriLang, Graphic, domStyle,
Legend,
ClassBreaksRenderer,
TooltipDialog, dijitPopup,
domConstruct, domClass,
number, domAttr, on, dom, parser
) {
// Use the info window instead of the popup.
var infoWindow = new InfoWindow(null, domConstruct.create("div"));
infoWindow.startup();
map = new Map("map", {
basemap: "gray",
center: [-122.5, 45.5],
infoWindow: infoWindow,
zoom: 5
});
map.infoWindow.resize(275, 275);
var symbol = new SimpleFillSymbol();
symbol.setColor(new Color([150, 150, 150, 0.5]));
var renderer = new ClassBreaksRenderer(symbol, "FAGI_MEDIAN_2010");
renderer.addBreak(0, 20000, new SimpleFillSymbol().setColor(new Color([56, 168, 0, 0.5])));
renderer.addBreak(20000, 30000, new SimpleFillSymbol().setColor(new Color([139, 209, 0, 0.5])));
renderer.addBreak(30000, 50000, new SimpleFillSymbol().setColor(new Color([255, 255, 0, 0.5])));
renderer.addBreak(50000, 80000, new SimpleFillSymbol().setColor(new Color([255, 128, 0, 0.5])));
renderer.addBreak(80000, 100000, new SimpleFillSymbol().setColor(new Color([255, 0, 0, 0.5])));
renderer.addBreak(100000, "Higher", new SimpleFillSymbol().setColor(new Color([153, 0, 79, 0.5])));
//featureLayer derived from ArcGIS Server map service Url
var featureLayer = new FeatureLayer("https://maps2.dcgis.dc.gov/dcgis/rest/services/DCGIS_DATA/Demographic_WebMercator/MapServer/8", {
mode: FeatureLayer.MODE_SNAPSHOT,
outFields: ["*"]
});
featureLayer.setRenderer(renderer);
var legend = new Legend({
map: map,
layerInfos: [{
title: "Family Meidan Income",
layer: featureLayer
}]
}, "legend");
function addGeoJsonLayer(url) {
// A GeoJsonLayer derived from GeoJSON Url
var geoJsonLayer = new GeoJsonLayer({
url: url,
maxdraw: 10000
});
geoJsonLayer._simplePolygonSym = new SimpleFillSymbol("solid", new SimpleLineSymbol("solid", new Color([255, 0, 0, 0.9]), 1), new Color([150, 255, 150, 0.0]));
// Zoom to layer
geoJsonLayer.on("update-end", function(e) {
map.setExtent(e.target.extent.expand(1.2));
});
// Add to map
map.addLayer(geoJsonLayer);
}
map.infoWindow.resize(245, 125);
dialog = new TooltipDialog({
id: "tooltipDialog",
style: "position: absolute; width: 250px; font: normal normal normal 10pt Helvetica;z-index:100"
});
dialog.startup();
var highlightSymbol = new SimpleFillSymbol(
SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(
SimpleLineSymbol.STYLE_SOLID,
new Color([255, 0, 0]), 3
),
new Color([125, 125, 125, 0.35])
);
//listen for when the onMouseOver event fires on the GraphicsLayer
//when fired, create a new graphic with the geometry from the event.graphic and add it to the maps graphics layer
featureLayer.on("mouse-over", function(evt) {
var t = "<b>Census Tract: ${TRACT}</b><hr>" + "<b>Population: </b>${P0010001:NumberFormat}<br>" + "<b>Area (Sq. Mi.): </b>${SQ_MILES:NumberFormat}<br>" + "<b>2010 Median Income: </b>$${FAGI_MEDIAN_2010:NumberFormat}";
var content = esriLang.substitute(evt.graphic.attributes, t);
var highlightGraphic = new Graphic(evt.graphic.geometry, highlightSymbol);
map.graphics.add(highlightGraphic);
dialog.setContent(content);
domStyle.set(dialog.domNode, "opacity", 1);
dijitPopup.open({
popup: dialog,
x: evt.pageX,
y: evt.pageY
});
});
function closeDialog() {
map.graphics.clear();
dijitPopup.close(dialog);
}
map.on("load", function() {
addGeoJsonLayer(censusGeoJsonUrl);
map.addLayer(featureLayer);
legend.startup();
map.graphics.enableMouseEvents();
map.graphics.on("mouse-out", closeDialog);
});
on(dom.byId("aboutTheMap"), "click", function() {
domStyle.set("about", "display", "block");
return false;
});
on(dom.byId("dismiss-about"), "click", function() {
domStyle.set("about", "display", "none");
return false;
});
});
</script>
</head>
<body class="tundra">
<div id="map">
</div>
<div class='header'>
<div id="title">Census Tracts by Median Income - 2010 @ Washington, DC</div>
<div id="sourceUrls" style="float:right">
<a id="dcOpenDataUrl" style="color:rgb(206,206,206);font-size:14px;margin-right: 10px;" href="https://github.com/DCgov/opendatadc-starterkit">This on Github</a>
<a id="aboutTheMap" style="color:rgb(206,206,206); font-size:14px; " href="javascript:void(0)">About This Map</a>
</div>
</div>
<div id="info">
<div id="legend"></div>
</div>
<div id="about">
<a id="dismiss-about">×</a>
<div id="inner">
<p style="font-size: 1.4em; text-transform: uppercase; text-align: center">About this map
</p>
<p style="font-size: 1.2em;">This sample demonstrates how to create a colorful interactive choropleth map of census tracts using data from DC Open Data with the help of Esri ArcGIS JS API.</p>
<p><strong>Instructions</strong>
<br/> Mouse over on census tracts for more information.</p>
<p><strong>Built with...</strong>
<br/> <a href="https://dojotoolkit.org/">Dojo</a>, <a href="https://developers.arcgis.com/javascript/">ArcGIS JS API</a></p>
<p><strong>Download Census Tracts - 2010 data in GeoJSON</strong>
<br/><a href="https://opendata.arcgis.com/datasets/6969dd63c5cb4d6aa32f15effb8311f3_8.geojson" target="_blank">https://opendata.arcgis.com/datasets/6969dd63c5cb4d6aa32f15effb8311f3_8.geojson</a></p>
<p><strong>View Census Tracts - 2010 data on DC Open Data</strong>
<br/><a href="http://opendata.dc.gov/datasets/census-tracts-2010" target="_blank">https://opendata.arcgis.com/datasets/6969dd63c5cb4d6aa32f15effb8311f3_8</a></p>
<p><strong>DC Open Data</strong>
<br/><a href="http://opendata.dc.gov" target="_blank">http://opendata.dc.gov</a></p>
<p><strong>DC Open Data Samples</strong>
<br/><a href="https://github.com/DCgov/opendatadc-starterkit" target="_blank">https://github.com/DCgov/opendatadc-starterkit</a></p>
<div id="logos" style="text-align: center">
<img src="images\WeAreWashintgonDCFinalLogo-Website.png" title="We are DC logo">
</div>
</div>
</div>
</body>
</html>