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dcopendata_school_buffer_arcgis.html
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dcopendata_school_buffer_arcgis.html
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<!DOCTYPE html>
<html>
<head>
<!-- Description: This sample demonstrates how to use geometry engine to buffer public schools from DC Open Data using Esri ArcGIS JavaScript API 4.X. -->
<!-- Attribution:
ArcGIS Geodev Hackerlabs, Url: https://github.com/Esri/geodev-hackerlabs
Styling inspired by Esri Story Map: https://storymaps.esri.com/stories/2016/top-stories/
-->
<title>Buffer Public Schools @Washington, DC</title>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<link rel="stylesheet" href="https://js.arcgis.com/4.0/esri/css/main.css">
<link rel="shortcut icon" type="image/x-icon" href="https://dc.gov/sites/default/files/favicon_0.ico">
<style>
html,
body,
#map-view {
position: absolute;
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
body {
font-family: "open_sanssemi", sans-serif;
}
.esri-ui-top-left {
top: 80px;
}
/*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: 300;
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: rgb(39, 39, 39);
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;
}
a {
color: #fff;
font-family: 'open_sansregular', sans-serif;
}
</style>
<script src="https://js.arcgis.com/4.0/"></script>
<script>
//Public Schools map services url
var schoolUrl = "https://maps2.dcgis.dc.gov/dcgis/rest/services/DCGIS_DATA/Education_WebMercator/MapServer/5";
require([
"esri/Map",
"esri/views/MapView",
"esri/layers/GraphicsLayer",
"esri/layers/FeatureLayer",
"esri/Graphic",
"esri/symbols/SimpleFillSymbol",
"esri/geometry/geometryEngineAsync",
"esri/renderers/SimpleRenderer",
"esri/symbols/SimpleMarkerSymbol",
"esri/symbols/SimpleLineSymbol",
"esri/Color",
"dojo/on",
"dojo/dom",
"dojo/dom-style",
"dojo/domReady!"
], function(Map, MapView,
GraphicsLayer, FeatureLayer, Graphic, SimpleFillSymbol, geometryEngineAsync, SimpleRenderer, SimpleMarkerSymbol, SimpleLineSymbol, Color, on, dom, domStyle) {
var map = new Map({
basemap: "dark-gray"
});
var view = new MapView({
container: "map-view",
map: map,
center: [-77.0252, 38.9029],
zoom: 12
});
// disable popup
view.popupManager.enabled=false;
// Add a layer to show the calculated buffer, and a layer for the buffer source data.
var bufferLayer = new GraphicsLayer();
var schoolLayer = new FeatureLayer({
url: schoolUrl
});
// Define school layer symbol
var line = new SimpleLineSymbol();
line.color = new Color('#fff');
var marker = new SimpleMarkerSymbol();
marker.size = 6;
marker.outline = line;
marker.color = new Color('#ef5151');
schoolLayer.renderer = new SimpleRenderer({
symbol: marker
});
map.addMany([bufferLayer, schoolLayer]);
// Configure the output buffer.
var bufferSymbol = new SimpleFillSymbol({
color: [0, 100, 255, 0.4],
style: "solid",
outline: {
color: [0, 100, 255],
width: 1
}
});
// Buffer the view's contents
view.whenLayerView(schoolLayer).then(function(schoolLayerView) {
schoolLayerView.watch("updating", function(isUpdating) {
if (!isUpdating) {
schoolLayerView.queryFeatures().then(function(schoolGraphics) {
// We need geometries, not graphics for the buffer operation.
var schoolPts = schoolGraphics.map(function(schoolGraphic) {
return schoolGraphic.geometry;
});
// Buffer and union all the points in the layer view.
geometryEngineAsync.geodesicBuffer(schoolPts, 0.4, "miles", true).then(function(totalBuffer) {
// Display the unioned buffer on the map.
bufferLayer.removeAll();
bufferLayer.add(new Graphic({
geometry: totalBuffer[0],
symbol: bufferSymbol
}));
});
});
}
});
});
//open About This panel
on(dom.byId("about-map"), "click", function() {
domStyle.set("about", "display", "block");
return false;
});
//close About This panel
on(dom.byId("dismiss-about"), "click", function() {
domStyle.set("about", "display", "none");
return false;
});
});
</script>
</head>
<body>
<div id="map-view"></div>
<div class='header'>
<div id="title">Buffer Public Schools @Washington, DC</div>
<div style="float:right">
<a style="color:rgb(206,206,206);font-size:14px;margin-right: 10px;" href="https://github.com/DCgov/opendatadc-starterkit" target="_blank">This on Github</a>
<a id="about-map" style="color:rgb(206,206,206);font-size:14px; " href="javascript:void(0)">About This Map</a>
</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 use geometry engine to buffer public schools from DC Open Data using Esri ArcGIS JavaScript API 4.X.
</p>
<p><strong>Instructions</strong>
<br/> Load the application and the school buffers will show up</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>Public Schools Map Service</strong>
<br/><a href="https://maps2.dcgis.dc.gov/dcgis/rest/services/DCGIS_DATA/Education_WebMercator/MapServer/5">https://maps2.dcgis.dc.gov/dcgis/rest/services/DCGIS_DATA/Education_WebMercator/MapServer/5</a></p>
<p><strong>View Public Schools Data on DC Open Data</strong>
<br/><a href="http://opendata.dc.gov/datasets/public-schools" target="_blank">https://opendata.arcgis.com/datasets/4ac321b2d409438ebd76a6569ad94034_5</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>Github Repository</strong>
<br/><a href="https://github.com/DCgov/opendatadc-starterkit" target="_blank">https://github.com/DCgov/opendatadc-starterkit</a></p>
<br/>
<div id="logos" style="text-align: center">
<img src="images\WeAreWashintgonDCFinalLogo-Website.png" title="We are DC logo">
</div>
</div>
</div>
</body>
</html>