Class: ImageryProvider

ImageryProvider

new ImageryProvider()

Provides imagery to be displayed on the surface of an ellipsoid. This type describes an interface and is not intended to be instantiated directly.
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Members

(readonly) credit :Credit

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 ImageryProvider#ready returns true.
Type:
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defaultAlpha :Number

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

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.
Type:
  • Number
Default Value:
  • undefined
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defaultContrast :Number

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.
Type:
  • Number
Default Value:
  • undefined
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defaultGamma :Number

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

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

defaultSaturation :Number

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.
Type:
  • Number
Default Value:
  • undefined
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(readonly) errorEvent :Event

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.
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(readonly) hasAlphaChannel :Boolean

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.
Type:
  • Boolean
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(readonly) maximumLevel :Number

Gets the maximum level-of-detail that can be requested. This function should not be called before ImageryProvider#ready returns true.
Type:
  • Number
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(readonly) minimumLevel :Number

Gets the minimum level-of-detail that can be requested. This function should not be called before ImageryProvider#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.
Type:
  • Number
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(readonly) proxy :Proxy

Gets the proxy used by this provider.
Type:
  • Proxy
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(readonly) ready :Boolean

Gets a value indicating whether or not the provider is ready for use.
Type:
  • Boolean
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(readonly) readyPromise :Promise.<Boolean>

Gets a promise that resolves to true when the provider is ready for use.
Type:
  • Promise.<Boolean>
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(readonly) rectangle :Rectangle

Gets the rectangle, in radians, of the imagery provided by the instance. This function should not be called before ImageryProvider#ready returns true.
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(readonly) tileDiscardPolicy :TileDiscardPolicy

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 ImageryProvider#ready returns true.
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(readonly) tileHeight :Number

Gets the height of each tile, in pixels. This function should not be called before ImageryProvider#ready returns true.
Type:
  • Number
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(readonly) tileWidth :Number

Gets the width of each tile, in pixels. This function should not be called before ImageryProvider#ready returns true.
Type:
  • Number
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(readonly) tilingScheme :TilingScheme

Gets the tiling scheme used by the provider. This function should not be called before ImageryProvider#ready returns true.
Type:
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Methods

(static) loadImage(url) → {Promise.<(Image|Canvas)>|undefined}

Loads an image from a given URL. If the server referenced by the URL already has too many requests pending, this function will instead return undefined, indicating that the request should be retried later.
Parameters:
Name Type Description
url String The URL of the image.
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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.
Type
Promise.<(Image|Canvas)> | undefined

getTileCredits(x, y, level) → {Array.<Credit>}

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

pickFeatures(x, y, level, longitude, latitude) → {Promise.<Array.<ImageryLayerFeatureInfo>>|undefined}

Asynchronously determines what features, if any, are located at a given longitude and latitude within a tile. This function should not be called before ImageryProvider#ready returns true. This function is optional, so it may not exist on all ImageryProviders.
Parameters:
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.
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Throws:
pickFeatures must not be called before the imagery provider is ready.
Type
DeveloperError
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.
Type
Promise.<Array.<ImageryLayerFeatureInfo>> | undefined

requestImage(x, y, level) → {Promise.<(Image|Canvas)>|undefined}

Requests the image for a given tile. This function should not be called before ImageryProvider#ready returns true.
Parameters:
Name Type Description
x Number The tile X coordinate.
y Number The tile Y coordinate.
level Number The tile level.
Source:
Throws:
requestImage must not be called before the imagery provider is ready.
Type
DeveloperError
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.
Type
Promise.<(Image|Canvas)> | undefined