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View Arroyo field production by time sample in sandbox
Arroyo field production by time

Description

This sample shows how to work with temporal data to display changes over time. The time aware layers are used to display arroyo field production over time. The time aware layer contains thousands of features so the sample applies a layer definition to restrict the displayed features to only those with a value of Arroyo.

arroyoFieldOil.setDefinitionExpression("FIELD = 'ARROYO'");

The FeatureLayers in the sample are in snapshot mode which means all features are retrieved from the server and stored in memory on the client. When the time extent changes queryFeatures is called to retrieve and summarize attribute information for the relevent features.

layer.queryFeatures(timeQuery,function(featureSet) {
var values = dojo.map(featureSet.features, function(feature) {
return feature.attributes[mappedField];
});
var stats = computeStats(values);

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>Arroyo Field Production by Time</title>
    
    <link rel="stylesheet" href="https://js.arcgis.com/3.36/dijit/themes/claro/claro.css">
    <link rel="stylesheet" href="https://js.arcgis.com/3.36/esri/css/esri.css">
    <style>
      #map { 
        display: inline-block; 
      }
      #oilLegendDiv {
        display: inline-block;
        height: 600px; 
        overflow: auto;
        padding: 0;
        width: 120px;
      }
      .templatePicker {
        border: 1px solid #000;
        border-radius: 0;
        -o-border-radius: 0;
        -moz-border-radius: 0;
        -webkit-border-radius: 0;
      }
    </style>

    <script>var dojoConfig = { parseOnLoad: true };</script>
    <script src="https://js.arcgis.com/3.36/"></script>
    <script>
      dojo.require("esri.map");
      dojo.require("esri.layers.FeatureLayer");
      dojo.require("esri.dijit.TimeSlider");
      dojo.require("esri.dijit.editing.TemplatePicker");
      dojo.require("dojox.lang.functional");
      dojo.require("dojox.lang.functional.fold");
      dojo.require("dojox.lang.functional.curry");

      var map;

      function init() {
        map = new esri.Map("map", {
          basemap: "streets",
          center: [-101.788, 37.513],
          zoom: 13
        });
        dojo.connect(map, "onLayersAddResult", initSlider);

        var fieldLayer = new esri.layers.FeatureLayer("https://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Petroleum/KSPetro/MapServer/1", {
          mode: esri.layers.FeatureLayer.MODE_SNAPSHOT
        });
        fieldLayer.setDefinitionExpression("FIELD_NAME = 'ARROYO'");
        map.addLayer(fieldLayer);

        var timeLayers = [];
        var arroyoFieldOil = new esri.layers.FeatureLayer("https://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Petroleum/StantonCountyKSLeases/MapServer/0", {
          mode: esri.layers.FeatureLayer.MODE_SNAPSHOT,
          outFields: ["*"]
        });
        arroyoFieldOil.setDefinitionExpression("FIELD = 'ARROYO'");
        timeLayers.push(arroyoFieldOil);
        var arroyoFieldGas = new esri.layers.FeatureLayer("https://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Petroleum/StantonCountyKSLeases/MapServer/1", {
          mode: esri.layers.FeatureLayer.MODE_SNAPSHOT,
          outFields: ["*"]
        });
        arroyoFieldGas.setDefinitionExpression("FIELD = 'ARROYO'");
        timeLayers.push(arroyoFieldGas);

        //add all the layers to the map then initialize the slider
        map.addLayers(timeLayers);
      }

      function initSlider(results) {
        var map = this;
        var timeLayers = dojo.map(results, function(result) {
          return result.layer;
        });
        //build a legend
        var symbols = [];
        dojo.forEach(results, function(result) {
          dojo.forEach(result.layer.renderer.infos, function(info) {
            symbols.push({
              label: info.minValue + " - " + info.maxValue,
              symbol: info.symbol
            });
          });
        });

        var legend = new esri.dijit.editing.TemplatePicker({
          items: symbols,
          rows: "auto",
          columns: 1
        }, "oilLegendDiv");
        legend.startup();

        var timeExtent = new esri.TimeExtent();
        timeExtent.startTime = new Date("1/1/1989 UTC");
        map.setTimeExtent(timeExtent);

        var timeSlider = new esri.dijit.TimeSlider({
          style: "width: 800px;"
        }, dojo.byId("timeSliderDiv"));
        map.setTimeSlider(timeSlider);
        timeSlider.setThumbCount(1);
        
        var layerTimeExtent = results[0].layer.timeInfo.timeExtent;
        layerTimeExtent.startTime = timeExtent.startTime;
        timeSlider.createTimeStopsByTimeInterval(layerTimeExtent, 1, 'esriTimeUnitsYears');
        timeSlider.setThumbMovingRate(2000);
        timeSlider.singleThumbAsTimeInstant(true);
        timeSlider.setLoop(true);
        timeSlider.startup();
        
        //add ticks just at beginning and end
        var labels = ['1989','2009'];
        timeSlider.setLabels(labels);

        var timeQuery = new esri.tasks.Query();
        dojo.connect(timeSlider, "onTimeExtentChange", function(timeExtent) {
          timeQuery.timeExtent = timeExtent;
          var yearlyLayerProduction = '';
          
          dojo.forEach(timeLayers, function(layer) {
            var mappedField = layer.renderer.attributeField;
            layer.queryFeatures(timeQuery, function(featureSet) {
              var values = dojo.map(featureSet.features, function(feature) {
                return feature.attributes[mappedField];
              });
              var stats = computeStats(values);
              var units = (layer.name === "Stanton County Oil Leases") ? "bbls" : "Mcf";
              yearlyLayerProduction = yearlyLayerProduction + layer.name + " produced " + stats.sum + " " + units + " with " + stats.length + " wells.  ";
            });
          });

          var startVal = timeExtent.startTime.getFullYear();
          console.log(startVal);
          dojo.byId("daterange").innerHTML = "<i>" + startVal + "<\/i> " + yearlyLayerProduction;
        });
      }

      function computeStats(values) {
        var stats = {};
        var df = dojox.lang.functional;
        stats.length = values.length;
        stats.sum = df.reduce(values, df.lambda("+"));
        stats.avg = stats.sum / stats.length;
        if (stats.length > 1) {
          var sumSquresF = df.partial(df.lambda("ss,x,avg->ss+Math.pow(x-avg,2)"), df.arg, df.arg, stats.avg);
          stats.sumSquares = df.reduce(values, sumSquresF);
          stats.stdDev = Math.sqrt(stats.sumSquares / stats.length);
        } else {
          stats.sumSquares = 0;
          stats.stdDev = 0;
        }
        return stats;
      }
      dojo.ready(init);
    </script>
  </head>
  
  <body class="claro">
    <div>
      Arroyo Field Production in
      <span id="daterange">
        1989
      </span>
    </div>
    <div id="map" style="width:800px; height:600px; border:1px solid #000;"></div>
    <div id="oilLegendDiv"></div>
    <div id="timeSliderDiv"></div>
  </body>
</html>
 
          
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