IonImageryProvider

new Cesium.IonImageryProvider(options)
Scene/IonImageryProvider.js 77

Provides tiled imagery using the Cesium ion REST API.
Name Type Description
options Object Object with the following properties:
Name Type Default Description
assetId Number An ion imagery asset ID;
accessToken String Ion.defaultAccessToken optional The access token to use.
server String | Resource Ion.defaultServer optional The resource to the Cesium ion API server.
Example:
viewer.imageryLayers.addImageryProvider(new Cesium.IonImageryProvider({ assetId : 23489024 }));

Members

readonlycredit : Credit
Scene/IonImageryProvider.js 388

Gets the credit to display when this imagery provider is active. Typically this is used to credit the source of the imagery. This function should not be called before IonImageryProvider#ready returns true.

defaultAlpha : Number
Scene/IonImageryProvider.js 92

The default alpha blending value of this provider, with 0.0 representing fully transparent and 1.0 representing fully opaque.
Default Value: undefined

defaultBrightness : Number
Scene/IonImageryProvider.js 101

The default brightness of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 makes the imagery darker while greater than 1.0 makes it brighter.
Default Value: undefined

defaultContrast : Number
Scene/IonImageryProvider.js 110

The default contrast of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 reduces the contrast while greater than 1.0 increases it.
Default Value: undefined

defaultGamma : Number
Scene/IonImageryProvider.js 135

The default gamma correction to apply to this provider. 1.0 uses the unmodified imagery color.
Default Value: undefined

defaultHue : Number
Scene/IonImageryProvider.js 118

The default hue of this provider in radians. 0.0 uses the unmodified imagery color.
Default Value: undefined

defaultMagnificationFilter : TextureMagnificationFilter
Scene/IonImageryProvider.js 151

The default texture magnification filter to apply to this provider.
Default Value: undefined

defaultMinificationFilter : TextureMinificationFilter
Scene/IonImageryProvider.js 143

The default texture minification filter to apply to this provider.
Default Value: undefined

defaultSaturation : Number
Scene/IonImageryProvider.js 127

The default saturation of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 reduces the saturation while greater than 1.0 increases it.
Default Value: undefined

readonlyerrorEvent : Event
Scene/IonImageryProvider.js 374

Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing to the event, you will be notified of the error and can potentially recover from it. Event listeners are passed an instance of TileProviderError.

readonlyhasAlphaChannel : Boolean
Scene/IonImageryProvider.js 409

Gets a value indicating whether or not the images provided by this imagery provider include an alpha channel. If this property is false, an alpha channel, if present, will be ignored. If this property is true, any images without an alpha channel will be treated as if their alpha is 1.0 everywhere. When this property is false, memory usage and texture upload time are reduced.

readonlymaximumLevel : Number
Scene/IonImageryProvider.js 295

Gets the maximum level-of-detail that can be requested. This function should not be called before IonImageryProvider#ready returns true.

readonlyminimumLevel : Number
Scene/IonImageryProvider.js 317

Gets the minimum level-of-detail that can be requested. This function should not be called before IonImageryProvider#ready returns true. Generally, a minimum level should only be used when the rectangle of the imagery is small enough that the number of tiles at the minimum level is small. An imagery provider with more than a few tiles at the minimum level will lead to rendering problems.

readonlyready : Boolean
Scene/IonImageryProvider.js 216

Gets a value indicating whether or not the provider is ready for use.

readonlyreadyPromise : Promise.<Boolean>
Scene/IonImageryProvider.js 228

Gets a promise that resolves to true when the provider is ready for use.

readonlyrectangle : Rectangle
Scene/IonImageryProvider.js 241

Gets the rectangle, in radians, of the imagery provided by the instance. This function should not be called before IonImageryProvider#ready returns true.

readonlytileDiscardPolicy : TileDiscardPolicy
Scene/IonImageryProvider.js 355

Gets the tile discard policy. If not undefined, the discard policy is responsible for filtering out "missing" tiles via its shouldDiscardImage function. If this function returns undefined, no tiles are filtered. This function should not be called before IonImageryProvider#ready returns true.

readonlytileHeight : Number
Scene/IonImageryProvider.js 277

Gets the height of each tile, in pixels. This function should not be called before IonImageryProvider#ready returns true.

readonlytileWidth : Number
Scene/IonImageryProvider.js 259

Gets the width of each tile, in pixels. This function should not be called before IonImageryProvider#ready returns true.

readonlytilingScheme : TilingScheme
Scene/IonImageryProvider.js 335

Gets the tiling scheme used by the provider. This function should not be called before IonImageryProvider#ready returns true.

Methods

getTileCredits(x, y, level) → Array.<Credit>
Scene/IonImageryProvider.js 432

Gets the credits to be displayed when a given tile is displayed.
Name Type Description
x Number The tile X coordinate.
y Number The tile Y coordinate.
level Number The tile level;
Returns:
The credits to be displayed when the tile is displayed.
Throws:
  • DeveloperError : getTileCredits must not be called before the imagery provider is ready.

pickFeatures(x, y, level, longitude, latitude) → Promise.<Array.<ImageryLayerFeatureInfo>>|undefined
Scene/IonImageryProvider.js 491

Asynchronously determines what features, if any, are located at a given longitude and latitude within a tile. This function should not be called before IonImageryProvider#ready returns true. This function is optional, so it may not exist on all ImageryProviders.
Name Type Description
x Number The tile X coordinate.
y Number The tile Y coordinate.
level Number The tile level.
longitude Number The longitude at which to pick features.
latitude Number The latitude at which to pick features.
Returns:
A promise for the picked features that will resolve when the asynchronous picking completes. The resolved value is an array of ImageryLayerFeatureInfo instances. The array may be empty if no features are found at the given location. It may also be undefined if picking is not supported.
Throws:
  • DeveloperError : pickFeatures must not be called before the imagery provider is ready.

requestImage(x, y, level, request) → Promise.<(Image|Canvas)>|undefined
Scene/IonImageryProvider.js 463

Requests the image for a given tile. This function should not be called before IonImageryProvider#ready returns true.
Name Type Description
x Number The tile X coordinate.
y Number The tile Y coordinate.
level Number The tile level.
request Request optional The request object. Intended for internal use only.
Returns:
A promise for the image that will resolve when the image is available, or undefined if there are too many active requests to the server, and the request should be retried later. The resolved image may be either an Image or a Canvas DOM object.
Throws:
  • DeveloperError : requestImage must not be called before the imagery provider is ready.