Features within 300 feet of selected feature

khanley — Fri, 19 Feb 2021 18:30:20 GMT

I see a lot of examples of queries using a circle to find features within a given distance of a center point, but I have yet to be able to find an example of a query done using a feature to find all features within a given distance.

Can someone point me in the right direction? I'm sure it's very similar to a circle but something just isn't clicking in my head.

Thank you.

Re: Features within 300 feet of selected feature

RobertScheitlin__GISP — Fri, 19 Feb 2021 19:55:11 GMT

Here is a mashup of the Select with Feature Layer and Geometry Service - Buffer samples. It querys the census block layer and buffers the results and uses that buffer to query census block points that intersect the buffer.

<!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>Select with feature layer</title> <link rel="stylesheet" href="https://js.arcgis.com/3.35/dijit/themes/tundra/tundra.css"> <link rel="stylesheet" href="https://js.arcgis.com/3.35/esri/css/esri.css"> <style> html, body, #mapDiv { padding: 0; margin: 0; height: 100%; } #messages{ background-color: #fff; box-shadow: 0 0 5px #888; font-size: 1.1em; max-width: 15em; padding: 0.5em; position: absolute; right: 20px; top: 20px; z-index: 40; } </style> <script src="https://js.arcgis.com/3.35/"></script> <script> var map; require([ "esri/map", "esri/layers/FeatureLayer", "esri/tasks/query", "esri/tasks/GeometryService", "esri/tasks/BufferParameters", "esri/graphic", "esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol", "esri/renderers/SimpleRenderer", "esri/config", "esri/Color", "dojo/dom", "dojo/domReady!" ], function( Map, FeatureLayer, Query, GeometryService, BufferParameters, Graphic, SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol, SimpleRenderer, esriConfig, Color, dom ) { esriConfig.defaults.geometryService = new GeometryService("https://utility.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer"); map = new Map("mapDiv", { basemap: "streets", center: [-95.249, 38.954], zoom: 14, slider: false }); // Add the census block points in on demand mode. An outfield is specified since it is used when calculating the total population falling within the one mile radius. var featureLayer = new FeatureLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0",{ outFields: ["POP2000"] }); // census block polygon layer var featureLayer2 = new FeatureLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/1",{ outFields: ["FIPS"] }); // Selection symbol used to draw the selected census block points within the buffer polygon var symbol = new SimpleMarkerSymbol( SimpleMarkerSymbol.STYLE_CIRCLE, 12, new SimpleLineSymbol( SimpleLineSymbol.STYLE_NULL, new Color([247, 34, 101, 0.9]), 1 ), new Color([207, 34, 171, 0.5]) ); featureLayer.setSelectionSymbol(symbol); // Make unselected features invisible var nullSymbol = new SimpleMarkerSymbol().setSize(0); featureLayer.setRenderer(new SimpleRenderer(nullSymbol)); map.addLayer(featureLayer); var blockSymb = new SimpleFillSymbol( SimpleFillSymbol.STYLE_NULL, new SimpleLineSymbol( SimpleLineSymbol.STYLE_SHORTDASHDOTDOT, new Color([105, 105, 105]), 2 ), new Color([255, 255, 0, 0.25]) ); var block, buffer; //setup the buffer parameters var params = new BufferParameters(); params.distances = [0.5]; params.outSpatialReference = map.spatialReference; params.unit = GeometryService["UNIT_STATUTE_MILE"]; setTimeout(function(){ var query2 = new Query(); query2.where = "FIPS = '200450004001'"; query2.returnGeometry = true; query2.outSpatialReference = map.spatialReference; featureLayer2.queryFeatures(query2, function(response){ map.graphics.clear(); block = response.features[0].geometry; var graphic = new Graphic(block, blockSymb); map.graphics.add(graphic); params.geometries = [block]; esriConfig.defaults.geometryService.buffer(params, showBuffer); }); }, 2000); function showBuffer(bufferedGeometries){ var symbol = new SimpleFillSymbol( SimpleFillSymbol.STYLE_NULL, new SimpleLineSymbol( SimpleLineSymbol.STYLE_SOLID, new Color([255,0,0,0.65]), 2 ), new Color([255,0,0,0.35]) ); buffer = bufferedGeometries[0]; var graphic = new Graphic(buffer, symbol); map.graphics.add(graphic); var query = new Query(); query.geometry = buffer.getExtent(); featureLayer.queryFeatures(query, selectInBuffer); } function selectInBuffer(response){ var feature; var features = response.features; var inBuffer = []; // Filter out features that are not actually in buffer, since we got all points in the buffer's bounding box for (var i = 0; i < features.length; i++) { feature = features[i]; if(buffer.contains(feature.geometry)){ inBuffer.push(feature.attributes[featureLayer.objectIdField]); } } var query = new Query(); query.objectIds = inBuffer; // Use an objectIds selection query (should not need to go to the server) featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(results){ var totalPopulation = sumPopulation(results); var r = ""; r = "<b>The total Census Block population within the Census Block buffered by .5 mi is <i>" + totalPopulation + "</i>.</b>"; dom.byId("messages").innerHTML = r; }); } function sumPopulation(features) { var popTotal = 0; for (var x = 0; x < features.length; x++) { popTotal = popTotal + features[x].attributes["POP2000"]; } return popTotal; } }); </script> </head> <body> <span id="messages">Wait for FIPS = '200450004001' Query to execute...</span> <div id="mapDiv"></div> </body> </html>

topic Re: Features within 300 feet of selected feature in ArcGIS JavaScript Maps SDK Questions

Features within 300 feet of selected feature

Re: Features within 300 feet of selected feature