Hosted feature layers
Feature layers displaying trailhead, trail, and park data stored as hosted feature layers
What is a hosted feature layer?
A hosted feature layer is a reference to a feature layer in a feature service used to store your data. A feature layer is a spatially-enabled table that contains features with a geometry and attributes. Applications can use feature layers to access, query, edit, and display features in a map or scene.
You use a hosted feature layer when you want to:
- Import files such as CSV, XLS, or Google Sheets with coordinate information.
- Store collections of geometry and attribute data as features.
- Access and display features in maps and scenes.
- Securely share data with applications and users.
- Optimize accessing and displaying large amounts of features.
- Edit data and track edits.
- Perform SQL or spatial queries.
- Update or export data.
- Use feature data in offline applications.
How a hosted feature layer works
You create a hosted feature layer by using data management tools to import files such as CSV, XLS, GeoJSON, Shapefile, and File Geodatabase files or by publishing feature data. When a hosted feature layer is created, an item and a feature layer in a feature service are created. The item ID is a unique identifier for the layer. You use an item page to manage a feature layer and a feature service to access the data.
Access hosted feature layers and feature services from your applications.
Manage a feature layer
An item page allows you to manage the properties and capabilities for a hosted feature layer. You can access an item page by signing in to your developer dashboard or ArcGIS Online. You can set properties such as the name, description, and tags, as well as sharing, editing, and index settings.
View a feature layer item page
To access an item page directly, use a portal search URL with the ID for the item. The portal URL for data hosted in ArcGIS is https://www.arcgis.com. To use this URL, the item must be shared publicly.
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https://www.arcgis.com/home/item.html?id=<ID>Example: https://www.arcgis.com/home/item.html?id=883cedb8c9fe4524b64d47666ed234a7
Access a feature layer
You can discover information about a feature layer by accessing the feature service endpoint with the layer ID. The ID is typically an integer such as "0" if there is only one layer in the feature service. Accessing the endpoint in a web browser allows you to view properties such as the name, geometry type, drawing information, extent, and fields. Most APIs will use the endpoint to perform other operations such as querying data.
Get feature layer properties
To access a feature layer or get properties, use the host, unique service ID, service name, and the layer ID.
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https://<host>/<uniqueID>/ArcGIS/rest/services/<serviceName>/FeatureServer/<layerID>Example: https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Trailheads/FeatureServer/0
Get feature layer data
To get feature layer data, use the host, unique service ID, service name, layer ID, and a query operation with parameters. You can provide a SQL or spatial query and the data can be returned as HTML, JSON, or GeoJSON.
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https://<host>/<uniqueID>/ArcGIS/rest/services/<serviceName>/FeatureServer/0/query?<params>Examples:
Examples
Display a feature layer
To display a hosted feature layer, you reference the layer by its URL or ID, and then add it to a map or scene. The API communicates with the feature service to retrieve data for the current visible extent. ArcGIS APIs optimize data access by utilizing feature service functionality such as spatial indexes and caching. APIs also need to specify which data attributes to return.
Steps
- Create a map or scene.
- Get the hosted feature layer URL.
- Add the layer.
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<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<title>ArcGIS Developer Guide: Data layers (Feature layers)</title>
<style>
html, body, #viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/themes/light/main.css">
<script src="https://js.arcgis.com/4.23/"></script>
<script>
require([
"esri/config",
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer"
], (esriConfig, Map, MapView, FeatureLayer)=> {
esriConfig.apiKey = "YOUR_API_KEY";
const map = new Map({
basemap: "arcgis-topographic" //Basemap service
});
const view = new MapView({
container: "viewDiv",
map: map,
center: [-118.80543,34.02700], //Longitude, latitude
zoom: 13,
constraints: {
snapToZoom: false
}
});
const trailheadsLayer = new FeatureLayer({
url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads_styled/FeatureServer/0"
});
map.add(trailheadsLayer);
const trailsLayer = new FeatureLayer({
url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails_styled/FeatureServer/0"
});
map.add(trailsLayer,0);
const parksLayer = new FeatureLayer({
url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space_styled/FeatureServer/0"
});
map.add(parksLayer,0);
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>Query a feature layer (Spatial)
To retrieve a sub-set of data for a hosted feature layer, you can query features using a spatial relation and a geometry. This example uses a spatial query to access a sub-set of parcels from a feature layer that contains 2.4 million features.
Steps
- Create a map or scene.
- Get the hosted feature layer URL.
- Create and execute a spatial query.
- Show the features.
APIs
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<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<title>ArcGIS API for JavaScript Tutorials: Query a feature layer (spatial)</title>
<style>
html, body, #viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/themes/light/main.css">
<script src="https://js.arcgis.com/4.23/"></script>
<script>
require([
"esri/config",
"esri/Map",
"esri/views/MapView",
"esri/widgets/Sketch",
"esri/layers/GraphicsLayer",
"esri/layers/FeatureLayer"
],(esriConfig, Map, MapView, Sketch, GraphicsLayer, FeatureLayer)=> {
esriConfig.apiKey = "YOUR_API_KEY";
const map = new Map({
basemap: "arcgis-topographic" //Basemap layer service
});
const view = new MapView({
container: "viewDiv",
map: map,
center: [-118.80543,34.03000], //Longitude, latitude
zoom: 13,
constraints: {
snapToZoom: false
}
});
// Add sketch widget
const graphicsLayerSketch = new GraphicsLayer();
map.add(graphicsLayerSketch);
const sketch = new Sketch({
layer: graphicsLayerSketch,
view: view,
creationMode: "update" // Auto-select
});
view.ui.add(sketch, "top-right");
// Add sketch events to listen for and execute query
sketch.on("update", (event) => {
// Create
if (event.state == "start") {
queryFeaturelayer(event.graphics[0].geometry);
};
if (event.state === "complete"){
graphicsLayerSketch.remove(event.graphics[0]); // Clear the graphic when a user clicks off of it or sketches new one
}
// Change
if (event.toolEventInfo && (event.toolEventInfo.type == "scale-stop" || event.toolEventInfo.type == "reshape-stop" || event.toolEventInfo.type == "move-stop")) {
queryFeaturelayer(event.graphics[0].geometry);
};
});
// Reference query layer
const parcelLayer = new FeatureLayer({
url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0",
});
function queryFeaturelayer(geometry) {
const parcelQuery = {
spatialRelationship: "intersects", // Relationship operation to apply
geometry: geometry, // The sketch feature geometry
outFields: ["APN","UseType","TaxRateCity","Roll_LandValue"], // Attributes to return
returnGeometry: true
};
parcelLayer.queryFeatures(parcelQuery)
.then((results) => {
displayResults(results);
}).catch((error) => {
console.log(error);
});
};
// Show features (graphics)
function displayResults(results) {
// Create a blue polygon
const symbol = {
type: "simple-fill",
color: [ 20, 130, 200, 0.5 ],
outline: {
color: "white",
width: .5
},
};
const popupTemplate = {
title: "Parcel {APN}",
content: "Type: {UseType} <br> Land value: {Roll_LandValue} <br> Tax Rate City: {TaxRateCity}"
};
// Set symbol and popup
results.features.map((feature) => {
feature.symbol = symbol;
feature.popupTemplate = popupTemplate;
return feature;
});
// Clear display
view.popup.close();
view.graphics.removeAll();
// Add features to graphics layer
view.graphics.addMany(results.features);
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>REST API
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curl https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0/query? \
-d "where=1=1" \
-d "outFields=*" \
-d "f=json" \
-d "geometry = {"x":-118.807,"y":34.002,"spatialReference":{"wkid":4326}}" \
-d "geometryType=esriGeometryPoint" \
-d "spatialRel = esriSpatialRelIntersects"1
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-13225305.3998295,
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],
[
-13225308.1459506,
4029116.70411896
],
[
-13225308.9964768,
4029109.13295152
],
[
-13225307.2637479,
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],
[
-13225305.3915899,
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],
[
-13225302.1801768,
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],
[
-13225299.0334013,
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],
[
-13225298.2461814,
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],
[
-13225297.8328254,
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],
[
-13225296.9241354,
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[
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[
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[
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[
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[
-13225298.9141852,
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],
[
-13225300.7172506,
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],
[
-13225301.337867,
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],
[
-13225302.3328017,
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],
[
-13225305.8128146,
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],
[
-13225310.3374986,
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],
[
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[
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[
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],
[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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[
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]
]
}
}
]
}
Query a feature layer (SQL)
To retrieve a sub-set of data for a hosted feature layer, you can query features using a SQL where clause. This example uses a SQL where clause to access a sub-set of parcels from a feature layer that contains 2.4 million features.
Steps
- Create a map or scene.
- Get the hosted feature layer URL.
- Create and execute a SQL query.
- Show the features.
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<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<title>ArcGIS API for JavaScript Tutorials: Query a feature layer (SQL)</title>
<style>
html, body, #viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
};
.esri-ui-corner .esri-component.esri-widget--panel {
width: 230px !important;
};
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/themes/light/main.css">
<script src="https://js.arcgis.com/4.23/"></script>
<script>
require([
"esri/config",
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer",
], (esriConfig, Map, MapView, FeatureLayer)=> {
esriConfig.apiKey = "YOUR_API_KEY";
const map = new Map({
basemap: "arcgis-topographic" //Basemap layer service
});
const view = new MapView({
container: "viewDiv",
map: map,
center: [-118.80543,34.03000], //Longitude, latitude
zoom: 13,
constraints: {
snapToZoom: false
}
});
// SQL query array
const parcelLayerSQL = ["Choose a SQL where clause...", "UseType = 'Residential'", "UseType = 'Government'", "UseType = 'Irrigated Farm'", "TaxRateArea = 10853", "TaxRateArea = 10860", "TaxRateArea = 08637", "Roll_LandValue > 1000000", "Roll_LandValue < 1000000"];
let whereClause = parcelLayerSQL[0];
// Add SQL UI
const select = document.createElement("select","");
select.setAttribute("class", "esri-widget esri-select");
select.setAttribute("style", "width: 200px; font-family: 'Avenir Next'; font-size: 1em");
parcelLayerSQL.forEach(function(query){
let option = document.createElement("option");
option.innerHTML = query;
option.value = query;
select.appendChild(option);
});
view.ui.add(select, "top-right");
// Listen for changes
select.addEventListener('change', (event) => {
whereClause = event.target.value;
queryFeatureLayer(view.extent);
});
// Get query layer and set up query
const parcelLayer = new FeatureLayer({
url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0",
});
function queryFeatureLayer(extent) {
const parcelQuery = {
where: whereClause, // Set by select element
spatialRelationship: "intersects", // Relationship operation to apply
geometry: extent, // Restricted to visible extent of the map
outFields: ["APN","UseType","TaxRateCity","Roll_LandValue"], // Attributes to return
returnGeometry: true
};
parcelLayer.queryFeatures(parcelQuery)
.then((results) => {
displayResults(results);
}).catch((error) => {
console.log(error.error);
});
};
function displayResults(results) {
// Create a blue polygon
const symbol = {
type: "simple-fill",
color: [ 20, 130, 200, 0.5 ],
outline: {
color: "white",
width: .5
},
};
const popupTemplate = {
title: "Parcel {APN}",
content: "Type: {UseType} <br> Land value: {Roll_LandValue} <br> Tax Rate City: {TaxRateCity}"
};
// Assign styles and popup to features
results.features.map((feature) => {
feature.symbol = symbol;
feature.popupTemplate = popupTemplate;
return feature;
});
// Clear display
view.popup.close();
view.graphics.removeAll();
// Add features to graphics layer
view.graphics.addMany(results.features);
};
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>REST API
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curl https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0/query? \
-d "where=UseType = 'Residential'" \
-d "resultRecordCount=1" \
-d "outFields=*" \
-d "f=json"