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Proportional symbols for points
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Description
Create proportional symbols by setting the size based on data values of the features.
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>Proportional symbols for points</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.26/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}
body {
background-color: #FFF;
overflow: hidden;
font-family: "Trebuchet MS";
}
</style>
<script src="https://js.arcgis.com/3.26/"></script>
<script>
var map;
require([
"esri/map", "esri/layers/FeatureLayer", "esri/InfoTemplate",
"dojo/domReady!"
], function(
Map, FeatureLayer, InfoTemplate
){
map = new Map("map", {
basemap:"streets",
center: [-82.441, 35.612],
zoom: 17
});
var template = new InfoTemplate("${Cmn_Name}", "<i>${Sci_Name}</i><br><br>The ${Cmn_Name} is <b>${Height} feet</b> tall with a total ground area of <b>${GroundArea} square feet</b>. This tree sequestors <b>${C_Seq} pounds</b> of carbon per year.");
var layer = new FeatureLayer("https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Warren_College_Trees/FeatureServer/0", {
mode: FeatureLayer.MODE_SNAPSHOT,
orderByFields: [ "GroundArea DESC" ],
outFields: ["Cmn_Name", "GroundArea", "Sci_Name", "Height", "C_Seq"],
infoTemplate: template
});
var sizeInfo = {
field:"GroundArea",
valueUnit:"feet",
valueRepresentation:"area"
};
layer.on("load", function() {
layer.renderer.setSizeInfo(sizeInfo);
layer.copyright = "Warren Wilson Center Campus Tree Study";
});
map.addLayers([layer]);
});
</script>
</head>
<body>
<div id="map">
<div style="font-family: Lucida Grande,Helvetica,Arial,Verdana,sans-serif; font-size: 14px; position: absolute; right: 7px; top: 7px; z-index: 100; padding: 5px; border: 2px solid #666666; border-radius: 5px; background-color: white; width:175px;">
<div id="tree_legend">
<div style="padding: 6px; text-align: center;">
Warren Wilson Center Campus <a href="https://www.warren-wilson.edu/~treemap/index.php" target="_blank">Tree Study</a><br><br>Map depicts tree canopy size and yearly carbon sequestration. Darker green trees sequestor more carbon. Touch a tree for more information.
</div>
</div>
</body>
</html>