# OpenStreetMapImageryProvider

#### new Cesium.OpenStreetMapImageryProvider(options)
Scene/OpenStreetMapImageryProvider.js 58

An imagery provider that provides tiled imagery hosted by OpenStreetMap or another provider of Slippy tiles. The default url connects to OpenStreetMap's volunteer-run servers, so you must conform to their Tile Usage Policy.

Name | Type | Description
--- | --- | ---
`options` | OpenStreetMapImageryProvider.ConstructorOptions | Object describing initialization options

##### Throws:

- DeveloperError : The rectangle and minimumLevel indicate that there are more than four tiles at the minimum level. Imagery providers with more than four tiles at the minimum level are not supported.

##### Example:

    var osm = new Cesium.OpenStreetMapImageryProvider({
        url : 'https://a.tile.openstreetmap.org/'
    });

##### See:

- ArcGisMapServerImageryProvider
- BingMapsImageryProvider
- GoogleEarthEnterpriseMapsProvider
- SingleTileImageryProvider
- TileMapServiceImageryProvider
- WebMapServiceImageryProvider
- WebMapTileServiceImageryProvider
- UrlTemplateImageryProvider
- OpenStreetMap Wiki
- Cross-Origin Resource Sharing

### Extends

- UrlTemplateImageryProvider

### Members

#### readonly credit : Credit
Scene/UrlTemplateImageryProvider.js 609

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 `UrlTemplateImageryProvider#ready` returns true.

Inherited From:
  - UrlTemplateImageryProvider#credit
Default Value: `undefined`

#### defaultAlpha : Number|undefined
Scene/UrlTemplateImageryProvider.js 226

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

Inherited From:
  - UrlTemplateImageryProvider#defaultAlpha
Default Value: `undefined`

#### defaultBrightness : Number|undefined
Scene/UrlTemplateImageryProvider.js 253

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.

Inherited From:
  - UrlTemplateImageryProvider#defaultBrightness
Default Value: `undefined`

#### defaultContrast : Number|undefined
Scene/UrlTemplateImageryProvider.js 262

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.

Inherited From:
  - UrlTemplateImageryProvider#defaultContrast
Default Value: `undefined`

#### defaultDayAlpha : Number|undefined
Scene/UrlTemplateImageryProvider.js 244

The default alpha blending value on the day side of the globe of this provider, with 0.0 representing fully transparent and 1.0 representing fully opaque.

Inherited From:
  - UrlTemplateImageryProvider#defaultDayAlpha
Default Value: `undefined`

#### defaultGamma : Number|undefined
Scene/UrlTemplateImageryProvider.js 287

The default gamma correction to apply to this provider. 1.0 uses the unmodified imagery color.

Inherited From:
  - UrlTemplateImageryProvider#defaultGamma
Default Value: `undefined`

#### defaultHue : Number|undefined
Scene/UrlTemplateImageryProvider.js 270

The default hue of this provider in radians. 0.0 uses the unmodified imagery color.

Inherited From:
  - UrlTemplateImageryProvider#defaultHue
Default Value: `undefined`

#### defaultMagnificationFilter : TextureMagnificationFilter
Scene/UrlTemplateImageryProvider.js 303

The default texture magnification filter to apply to this provider.

Inherited From:
  - UrlTemplateImageryProvider#defaultMagnificationFilter
Default Value: `undefined`

#### defaultMinificationFilter : TextureMinificationFilter
Scene/UrlTemplateImageryProvider.js 295

The default texture minification filter to apply to this provider.

Inherited From:
  - UrlTemplateImageryProvider#defaultMinificationFilter
Default Value: `undefined`

#### defaultNightAlpha : Number|undefined
Scene/UrlTemplateImageryProvider.js 235

The default alpha blending value on the night side of the globe of this provider, with 0.0 representing fully transparent and 1.0 representing fully opaque.

Inherited From:
  - UrlTemplateImageryProvider#defaultNightAlpha
Default Value: `undefined`

#### defaultSaturation : Number|undefined
Scene/UrlTemplateImageryProvider.js 279

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.

Inherited From:
  - UrlTemplateImageryProvider#defaultSaturation
Default Value: `undefined`

#### enablePickFeatures : Boolean
Scene/UrlTemplateImageryProvider.js 314

Gets or sets a value indicating whether feature picking is enabled. If true, `UrlTemplateImageryProvider#pickFeatures` will request the `options.pickFeaturesUrl` and attempt to interpret the features included in the response. If false, `UrlTemplateImageryProvider#pickFeatures` will immediately return undefined (indicating no pickable features) without communicating with the server. Set this property to false if you know your data source does not support picking features or if you don't want this provider's features to be pickable.

Inherited From:
  - UrlTemplateImageryProvider#enablePickFeatures
Default Value: `true`

#### readonly errorEvent : Event
Scene/UrlTemplateImageryProvider.js 571

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`.

Inherited From:
  - UrlTemplateImageryProvider#errorEvent

#### readonly hasAlphaChannel : Boolean
Scene/UrlTemplateImageryProvider.js 634

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. This function should not be called before `ImageryProvider#ready` returns true.

Inherited From:
  - UrlTemplateImageryProvider#hasAlphaChannel
Default Value: `true`

#### readonly maximumLevel : Number|undefined
Scene/UrlTemplateImageryProvider.js 464

Gets the maximum level-of-detail that can be requested, or undefined if there is no limit. This function should not be called before `UrlTemplateImageryProvider#ready` returns true.

Inherited From:
  - UrlTemplateImageryProvider#maximumLevel
Default Value: `undefined`

#### readonly minimumLevel : Number
Scene/UrlTemplateImageryProvider.js 485

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

Inherited From:
  - UrlTemplateImageryProvider#minimumLevel
Default Value: `0`

#### readonly pickFeaturesUrl : String
Scene/UrlTemplateImageryProvider.js 395

Gets the URL template to use to use to pick features. If this property is not specified, `UrlTemplateImageryProvider#pickFeatures` will immediately return undefined, indicating no features picked. The URL template supports all of the keywords supported by the `UrlTemplateImageryProvider#url` property, plus the following:

- `{i}`: The pixel column (horizontal coordinate) of the picked position, where the Westernmost pixel is 0.
- `{j}`: The pixel row (vertical coordinate) of the picked position, where the Northernmost pixel is 0.
- `{reverseI}`: The pixel column (horizontal coordinate) of the picked position, where the Easternmost pixel is 0.
- `{reverseJ}`: The pixel row (vertical coordinate) of the picked position, where the Southernmost pixel is 0.
- `{longitudeDegrees}`: The longitude of the picked position in degrees.
- `{latitudeDegrees}`: The latitude of the picked position in degrees.
- `{longitudeProjected}`: The longitude of the picked position in the projected coordinates of the tiling scheme.
- `{latitudeProjected}`: The latitude of the picked position in the projected coordinates of the tiling scheme.
- `{format}`: The format in which to get feature information, as specified in the `GetFeatureInfoFormat`.

Inherited From:
  - UrlTemplateImageryProvider#pickFeaturesUrl

#### readonly proxy : Proxy
Scene/UrlTemplateImageryProvider.js 408

Gets the proxy used by this provider.

Inherited From:
  - UrlTemplateImageryProvider#proxy
Default Value: `undefined`

#### readonly ready : Boolean
Scene/UrlTemplateImageryProvider.js 583

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

Inherited From:
  - UrlTemplateImageryProvider#ready

#### readonly readyPromise : Promise.<Boolean>
Scene/UrlTemplateImageryProvider.js 595

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

Inherited From:
  - UrlTemplateImageryProvider#readyPromise

#### readonly rectangle : Rectangle
Scene/UrlTemplateImageryProvider.js 527

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

Inherited From:
  - UrlTemplateImageryProvider#rectangle
Default Value: `tilingScheme.rectangle`

#### readonly tileDiscardPolicy : TileDiscardPolicy
Scene/UrlTemplateImageryProvider.js 550

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 `UrlTemplateImageryProvider#ready` returns true.

Inherited From:
  - UrlTemplateImageryProvider#tileDiscardPolicy
Default Value: `undefined`

#### readonly tileHeight : Number
Scene/UrlTemplateImageryProvider.js 443

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

Inherited From:
  - UrlTemplateImageryProvider#tileHeight
Default Value: `256`

#### readonly tileWidth : Number
Scene/UrlTemplateImageryProvider.js 422

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

Inherited From:
  - UrlTemplateImageryProvider#tileWidth
Default Value: `256`

#### readonly tilingScheme : TilingScheme
Scene/UrlTemplateImageryProvider.js 506

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

Inherited From:
  - UrlTemplateImageryProvider#tilingScheme
Default Value: `new WebMercatorTilingScheme()`

#### readonly url : String
Scene/UrlTemplateImageryProvider.js 345

Gets the URL template to use to request tiles. It has the following keywords:

- `{z}`: The level of the tile in the tiling scheme. Level zero is the root of the quadtree pyramid.
- `{x}`: The tile X coordinate in the tiling scheme, where 0 is the Westernmost tile.
- `{y}`: The tile Y coordinate in the tiling scheme, where 0 is the Northernmost tile.
- `{s}`: One of the available subdomains, used to overcome browser limits on the number of simultaneous requests per host.
- `{reverseX}`: The tile X coordinate in the tiling scheme, where 0 is the Easternmost tile.
- `{reverseY}`: The tile Y coordinate in the tiling scheme, where 0 is the Southernmost tile.
- `{reverseZ}`: The level of the tile in the tiling scheme, where level zero is the maximum level of the quadtree pyramid. In order to use reverseZ, maximumLevel must be defined.
- `{westDegrees}`: The Western edge of the tile in geodetic degrees.
- `{southDegrees}`: The Southern edge of the tile in geodetic degrees.
- `{eastDegrees}`: The Eastern edge of the tile in geodetic degrees.
- `{northDegrees}`: The Northern edge of the tile in geodetic degrees.
- `{westProjected}`: The Western edge of the tile in projected coordinates of the tiling scheme.
- `{southProjected}`: The Southern edge of the tile in projected coordinates of the tiling scheme.
- `{eastProjected}`: The Eastern edge of the tile in projected coordinates of the tiling scheme.
- `{northProjected}`: The Northern edge of the tile in projected coordinates of the tiling scheme.
- `{width}`: The width of each tile in pixels.
- `{height}`: The height of each tile in pixels.

Inherited From:
  - UrlTemplateImageryProvider#url

#### readonly urlSchemeZeroPadding : Object
Scene/UrlTemplateImageryProvider.js 369

Gets the URL scheme zero padding for each tile coordinate. The format is '000' where each coordinate will be padded on the left with zeros to match the width of the passed string of zeros. e.g. Setting: urlSchemeZeroPadding : { '{x}' : '0000'} will cause an 'x' value of 12 to return the string '0012' for {x} in the generated URL. It has the following keywords:

- `{z}`: The zero padding for the level of the tile in the tiling scheme.
- `{x}`: The zero padding for the tile X coordinate in the tiling scheme.
- `{y}`: The zero padding for the the tile Y coordinate in the tiling scheme.
- `{reverseX}`: The zero padding for the tile reverseX coordinate in the tiling scheme.
- `{reverseY}`: The zero padding for the tile reverseY coordinate in the tiling scheme.
- `{reverseZ}`: The zero padding for the reverseZ coordinate of the tile in the tiling scheme.

Inherited From:
  - UrlTemplateImageryProvider#urlSchemeZeroPadding

### Methods

#### getTileCredits(x, y, level) → Array.<Credit>
Scene/UrlTemplateImageryProvider.js 737

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.

Inherited From:
  - UrlTemplateImageryProvider#getTileCredits

#### pickFeatures(x, y, level, longitude, latitude) → Promise.<Array.<ImageryLayerFeatureInfo>>|undefined
Scene/UrlTemplateImageryProvider.js 794

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.

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.

Inherited From:
  - UrlTemplateImageryProvider#pickFeatures

#### reinitialize(options)
Scene/UrlTemplateImageryProvider.js 654

Reinitializes this instance. Reinitializing an instance already in use is supported, but it is not recommended because existing tiles provided by the imagery provider will not be updated.

Name | Type | Description
--- | --- | ---
`options` | Promise.<Object> | Object | Any of the options that may be passed to the `UrlTemplateImageryProvider` constructor.

Inherited From:
  - UrlTemplateImageryProvider#reinitialize

#### requestImage(x, y, level, request) → Promise.<(HTMLImageElement|HTMLCanvasElement)>|undefined
Scene/UrlTemplateImageryProvider.js 761

Requests the image for a given tile. This function should not be called before `UrlTemplateImageryProvider#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.

Inherited From:
  - UrlTemplateImageryProvider#requestImage

### Type Definitions

#### Cesium.OpenStreetMapImageryProvider.ConstructorOptions
Scene/OpenStreetMapImageryProvider.js 14

Initialization options for the OpenStreetMapImageryProvider constructor

##### Properties:

Name | Type | Attributes | Default | Description
--- | --- | --- | --- | ---
`url` | String | <optional> | 'https://a.tile.openstreetmap.org' | The OpenStreetMap server url.
`fileExtension` | String | <optional> | 'png' | The file extension for images on the server.
`rectangle` | Rectangle | <optional> | Rectangle.MAX_VALUE | The rectangle of the layer.
`minimumLevel` | Number | <optional> | 0 | The minimum level-of-detail supported by the imagery provider.
`maximumLevel` | Number | <optional> |  | The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit.
`ellipsoid` | Ellipsoid | <optional> |  | The ellipsoid. If not specified, the WGS84 ellipsoid is used.
`credit` | Credit | String | <optional> | 'MapQuest, Open Street Map and contributors, CC-BY-SA' | A credit for the data source, which is displayed on the canvas.