# OpenStreetMapImageryProvider

#### new Cesium.OpenStreetMapImageryProvider(options)
engine/Source/Scene/OpenStreetMapImageryProvider.js 59

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:

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

##### See:

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

### Extends

- UrlTemplateImageryProvider

### Members

#### readonly credit : Credit
engine/Source/Scene/UrlTemplateImageryProvider.js 482

Gets the credit to display when this imagery provider is active. Typically this is used to credit the source of the imagery.

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

#### enablePickFeatures : boolean
engine/Source/Scene/UrlTemplateImageryProvider.js 269

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
engine/Source/Scene/UrlTemplateImageryProvider.js 468

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
engine/Source/Scene/UrlTemplateImageryProvider.js 499

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.

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

#### readonly maximumLevel : number|undefined
engine/Source/Scene/UrlTemplateImageryProvider.js 400

Gets the maximum level-of-detail that can be requested, or undefined if there is no limit.

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

#### readonly minimumLevel : number
engine/Source/Scene/UrlTemplateImageryProvider.js 413

Gets the minimum level-of-detail that can be requested.

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

#### readonly pickFeaturesUrl : string
engine/Source/Scene/UrlTemplateImageryProvider.js 348

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
engine/Source/Scene/UrlTemplateImageryProvider.js 361

Gets the proxy used by this provider.

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

#### readonly rectangle : Rectangle
engine/Source/Scene/UrlTemplateImageryProvider.js 439

Gets the rectangle, in radians, of the imagery provided by this instance.

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

#### readonly tileDiscardPolicy : TileDiscardPolicy
engine/Source/Scene/UrlTemplateImageryProvider.js 454

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.

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

#### readonly tileHeight : number
engine/Source/Scene/UrlTemplateImageryProvider.js 387

Gets the height of each tile, in pixels.

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

#### readonly tileWidth : number
engine/Source/Scene/UrlTemplateImageryProvider.js 374

Gets the width of each tile, in pixels.

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

#### readonly tilingScheme : TilingScheme
engine/Source/Scene/UrlTemplateImageryProvider.js 426

Gets the tiling scheme used by this provider.

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

#### readonly url : string
engine/Source/Scene/UrlTemplateImageryProvider.js 298

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
engine/Source/Scene/UrlTemplateImageryProvider.js 322

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>
engine/Source/Scene/UrlTemplateImageryProvider.js 514

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.

Inherited From:
  - UrlTemplateImageryProvider#getTileCredits

#### pickFeatures(x, y, level, longitude, latitude) → Promise.<Array.<ImageryLayerFeatureInfo>>|undefined
engine/Source/Scene/UrlTemplateImageryProvider.js 552

Asynchronously determines what features, if any, are located at a given longitude and latitude within a tile.

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

#### requestImage(x, y, level, request) → Promise.<ImageryTypes>|undefined
engine/Source/Scene/UrlTemplateImageryProvider.js 526

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.

Inherited From:
  - UrlTemplateImageryProvider#requestImage

### Type Definitions

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

Initialization options for the OpenStreetMapImageryProvider constructor

##### Properties:

Name | Type | Attributes | Default | Description
--- | --- | --- | --- | ---
`url` | string | <optional> | 'https://tile.openstreetmap.org' | The OpenStreetMap server url.
`fileExtension` | string | <optional> | 'png' | The file extension for images on the server.
`retinaTiles` | boolean | <optional> | false | When true, request tiles at the 2x resolution for retina displays.
`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.

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