Basemap

AMD: require(["esri/Basemap"], (Basemap) => { /* code goes here */ });
ESM: import Basemap from "@arcgis/core/Basemap.js";
Class: esri/Basemap
Inheritance: Basemap Accessor
Since: ArcGIS Maps SDK for JavaScript 4.0

Overview

A basemap is a collection of layers that provide geographic context to a map or scene with data such as topographic features, road networks, buildings, and labels. These features can be represented with different styles as applicable to your application, such as streets, topographic, or imagery.

A basemap can contain both base layers, which comprise one or more tiled layers, and reference layers. Reference layers are displayed on top of the base layers, and can be used, for example, to display labels on top of terrain or streets.

In a MapView, a basemap's reference layers are limited to tiled layers, while in a SceneView they can also contain Scene Layers and be used to display 3D content. For example, a 3D basemap could include 3D objects such as buildings and trees, or labels to be rendered in 3D, either draped over the terrain in a tiled layer, or billboarded in a scene layer.

Creating a Basemap

Creates a new basemap object. Basemaps can be created in a variety of ways:

  1. From a PortalItem
    // in this case the portalItem has to be a webmap
    const basemap = new Basemap({
      portalItem: {
        id: "8dda0e7b5e2d4fafa80132d59122268c"  // WGS84 Streets Vector webmap
      }
    });
    
  2. From a basemap id
    // create the basemap from a basemap id
    Basemap.fromId("topo-vector");
    
  3. From a basemap style
    // create a basemap from the basemap styles service
    const basemap = new Basemap({
      style: {
        id: "arcgis/outdoor",
        language: "es" // displays basemap place labels in spanish
      }
    });
    
  4. From a custom basemap layer. These basemaps may be created from tiled services you publish to your own server, or from tiled services published by third parties.
    // create from a third party source
    const basemap = new Basemap({
      baseLayers: [
        new WebTileLayer(...)
      ],
      referenceLayers: [
        new WebTileLayer(...)
      ]
    });
    

Setting the LOD

The MapView.constraints.lods property should be specified when using a dynamic service for a basemap. Do this by either explicitly setting the lods within this property, or create the lods via the create() method on the TileInfo class. This method is used to create a new TileInfo instance with preset properties for lods. See Zoom and LODs section in MapView SDK document for more information.

// create a basemap from a dynamic mapserver
const basemap = new Basemap({
  baseLayers: [
    new MapImageLayer({
      url: "url to your dynamic MapServer",
      title: "Basemap"
    })
  ],
  title: "basemap",
  id: "basemap"
});

const map = new Map({
  basemap: basemap
});

// create a TileInfo instance using the default settings and
// pass its resulting LOD's to a MapView's constraints
// in this case, lods will match the ArcGIS Online web mercator LODs
const view = new MapView({
  container: "viewDiv",
  map: map,
  constraints: {
    lods: TileInfo.create().lods
  }
});

Waiting for Load

The when() method on the Basemap instance can be called to execute processes that may only run after the Basemap is loaded.

See also

Constructors

Basemap

Constructor
new Basemap(properties)
Parameter
properties Object
optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class
Collection<Layer>

A collection of tile layers that make up the basemap's features.

Basemap
String

The name of the class.

Accessor
String

An identifier used to refer to the basemap when referencing it elsewhere.

Basemap
Boolean

Indicates whether the basemap instance has loaded.

Basemap
Error

The Error object returned if an error occurred while loading.

Basemap
String

Represents the status of a load operation.

Basemap
Object[]

A list of warnings which occurred while loading.

Basemap
PortalItem

The portal item.

Basemap
Collection<Layer>

A collection of reference layers which are displayed over the base layers and can be used to display labels on top of terrain or streets.

Basemap
SpatialReference

The spatial reference of the Basemap.

Basemap
BasemapStyle

The style of the basemap from the basemap styles service (v2).

Basemap
String

The URL pointing to an image that represents the basemap.

Basemap
String

The title of the basemap.

Basemap

Property Details

baseLayers

Property
baseLayers Collection<Layer>autocast

A collection of tile layers that make up the basemap's features.

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.7 Accessor since 4.0, declaredClass added at 4.7.

The name of the class. The declared class name is formatted as esri.folder.className.

id

Property
id String

An identifier used to refer to the basemap when referencing it elsewhere.

Example
const customBasemap = new Basemap({
  baseLayers: [layers],
  title: "Custom Basemap",
  id: "myBasemap"
});

loaded

Property
loaded Booleanreadonly

Indicates whether the basemap instance has loaded. When true, all the properties of the object can be accessed.

Default Value:false

loadError

Property
loadError Errorreadonly

The Error object returned if an error occurred while loading.

Default Value:null

loadStatus

Property
loadStatus Stringreadonly

Represents the status of a load operation.

Value Description
not-loaded The object's resources have not loaded.
loading The object's resources are currently loading.
loaded The object's resources have loaded without errors.
failed The object's resources failed to load. See loadError for more details.

Possible Values:"not-loaded"|"loading"|"failed"|"loaded"

Default Value:not-loaded

loadWarnings

Property
loadWarnings Object[]readonly

A list of warnings which occurred while loading.

portalItem

Property
portalItem PortalItemautocast

The portal item.

referenceLayers

Property
referenceLayers Collection<Layer>

A collection of reference layers which are displayed over the base layers and can be used to display labels on top of terrain or streets. In a MapView, a basemap's reference layers are limited to tiled layers, while in a SceneView they can also contain Scene Layers and be used to display objects or labels in 3D.

spatialReference

Property
spatialReference SpatialReferenceautocast
Since: ArcGIS Maps SDK for JavaScript 4.14 Basemap since 4.0, spatialReference added at 4.14.

The spatial reference of the Basemap. For complete listings of supported coordinate systems, see Using spatial references.

When using an Esri basemap, the default spatial reference is Web Mercator Auxiliary Sphere.

style

Property
style BasemapStyleautocast
Since: ArcGIS Maps SDK for JavaScript 4.28 Basemap since 4.0, style added at 4.28.

The style of the basemap from the basemap styles service (v2). The basemap styles service is a ready-to-use location service that serves vector and image tiles representing geographic features around the world.

You can use the service to display:

  • Streets and navigation styles
  • Imagery, oceanic, and topographic styles
  • OSM standard and streets styles
  • Creative styles such as nova and blue print
  • Localized place labels
  • Places with styles - since 4.29
  • Worldview boundaries - since 4.29

Use of the basemap style service requires authentication via an API key or user authentication. To learn more about API keys, see the API keys section in the ArcGIS Developer documentation.

Examples
// creates an arcgis streets basemap with french place labels
const basemap = new Basemap({
  style: {
    id: "arcgis/streets",
    language: "fr"
  }
});
// creates an arcgis navigation basemap with places
const basemap = new Basemap({
  style: {
    id: "arcgis/navigation",
    places: "all"
  }
});

thumbnailUrl

Property
thumbnailUrl String

The URL pointing to an image that represents the basemap. When using a custom basemap in the BasemapToggle widget, the image specified here will display in the widget. When the user clicks the image, the map's basemap will update to the basemap associated with the image.

title

Property
title String

The title of the basemap.

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

Accessor

Cancels a load() operation if it is already in progress.

Basemap
Basemap

Creates a deep clone of this object.

Basemap

Destroys the basemap, and any associated resources, including its layers and portalItem.

Basemap
Basemap

Creates a new basemap instance from a basemap id.

Basemap
*

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.

Basemap
Boolean

Returns true if a named group of handles exist.

Accessor
Boolean

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).

Basemap
Boolean

isRejected() may be used to verify if creating an instance of the class is rejected.

Basemap
Boolean

isResolved() may be used to verify if creating an instance of the class is resolved.

Basemap
Promise

Loads the resources referenced by this class.

Basemap
Promise<Basemap>

Loads all the externally loadable resources associated with the basemap.

Basemap

Removes a group of handles owned by the object.

Accessor
Object

Converts an instance of this class to its ArcGIS portal JSON representation.

Basemap
Promise

when() may be leveraged once an instance of the class is created.

Basemap

Method Details

addHandles

Inherited
Method
addHandles(handleOrHandles, groupKey)
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 4.25.

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();
Parameters
handleOrHandles WatchHandle|WatchHandle[]

Handles marked for removal once the object is destroyed.

groupKey *
optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

cancelLoad

Method
cancelLoad()

Cancels a load() operation if it is already in progress.

clone

Method
clone(){Basemap}

Creates a deep clone of this object.

Returns
Type Description
Basemap A deep clone of the Basemap instance that invoked this method.

destroy

Method
destroy()
Since: ArcGIS Maps SDK for JavaScript 4.17 Basemap since 4.0, destroy added at 4.17.

Destroys the basemap, and any associated resources, including its layers and portalItem. These can no longer be used once the basemap has been destroyed. To prevent these objects from being destroyed, remove them from the basemap before calling destroy().

// prevent the layers from being destroyed by removing them from the basemap
const baseLayers = basemap.baseLayers.removeAll();
const referenceLayers = basemap.referenceLayers.removeAll();

// unset portalItem from the basemap so that it is not destroyed
const portalItem = basemap.portalItem;
basemap.portalItem = null;

// destroy the basemap and any remaining associated resources
basemap.destroy();

fromId

Method
fromId(id){Basemap}static

Creates a new basemap instance from a basemap id. See basemap id for a list of possible values.

Parameter
id String

The basemap id.

Returns
Type Description
Basemap A new Basemap instance.
Examples
const streetsBasemap = Basemap.fromId("streets-vector");
const nightBasemap = Basemap.fromId("streets-night-vector");

fromJSON

Method
fromJSON(json){*}static

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameter
json Object

A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns
Type Description
* Returns a new instance of this class.

hasHandles

Inherited
Method
hasHandles(groupKey){Boolean}
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter
groupKey *
optional

A group key.

Returns
Type Description
Boolean Returns true if a named group of handles exist.
Example
// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

isFulfilled

Method
isFulfilled(){Boolean}

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned.

Returns
Type Description
Boolean Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).

isRejected

Method
isRejected(){Boolean}

isRejected() may be used to verify if creating an instance of the class is rejected. If it is rejected, true will be returned.

Returns
Type Description
Boolean Indicates whether creating an instance of the class has been rejected.

isResolved

Method
isResolved(){Boolean}

isResolved() may be used to verify if creating an instance of the class is resolved. If it is resolved, true will be returned.

Returns
Type Description
Boolean Indicates whether creating an instance of the class has been resolved.

load

Method
load(signal){Promise}

Loads the resources referenced by this class. This method automatically executes for a View and all of the resources it references in Map if the view is constructed with a map instance.

This method must be called by the developer when accessing a resource that will not be loaded in a View.

The load() method only triggers the loading of the resource the first time it is called. The subsequent calls return the same promise.

It's possible to provide a signal to stop being interested into a Loadable instance load status. When the signal is aborted, the instance does not stop its loading process, only cancelLoad can abort it.

Parameter
signal AbortSignal
optional

Signal object that can be used to abort the asynchronous task. The returned promise will be rejected with an Error named AbortError when an abort is signaled. See also AbortController for more information on how to construct a controller that can be used to deliver abort signals.

Returns
Type Description
Promise Resolves when the resources have loaded.

loadAll

Method
loadAll(){Promise<Basemap>}
Since: ArcGIS Maps SDK for JavaScript 4.9 Basemap since 4.0, loadAll added at 4.9.

Loads all the externally loadable resources associated with the basemap. For the basemap this will load all the base layers and reference layers.

Returns
Type Description
Promise<Basemap> Resolves when all the loadable resources have been loaded. Rejects if at least one of the loadable resources failed to load.
See also
Example
// Load all resources but ignore if one or more of them failed to load
basemap.loadAll()
  .catch(function(error) {
    // Ignore any failed resources
  })
  .then(function() {
    console.log("All loaded");
  });

removeHandles

Inherited
Method
removeHandles(groupKey)
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter
groupKey *
optional

A group key or an array or collection of group keys to remove.

Example
obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

toJSON

Method
toJSON(){Object}

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns
Type Description
Object The ArcGIS portal JSON representation of an instance of this class.

when

Method
when(callback, errback){Promise}
Since: ArcGIS Maps SDK for JavaScript 4.6 Basemap since 4.0, when added at 4.6.

when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function. The callback executes when the instance of the class loads. The errback executes if the instance of the class fails to load.

Parameters
callback Function
optional

The function to call when the promise resolves.

errback Function
optional

The function to execute when the promise fails.

Returns
Type Description
Promise Returns a new promise for the result of callback that may be used to chain additional functions.
Example
// Although this example uses MapView, any class instance that is a promise may use when() in the same way
let view = new MapView();
view.when(function(){
  // This function will execute once the promise is resolved
}, function(error){
  // This function will execute if the promise is rejected due to an error
});

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