# WebMapServiceImageryProvider

#### new Cesium.WebMapServiceImageryProvider(options)
Scene/WebMapServiceImageryProvider.js 88

Provides tiled imagery hosted by a Web Map Service (WMS) server.

Name | Type | Description
--- | --- | ---

`options`

Object

Object with the following properties:

Name | Type | Default | Description
--- | --- | --- | ---
`url` | Resource | String |  | The URL of the WMS service. The URL supports the same keywords as the `UrlTemplateImageryProvider`.
`layers` | String |  | The layers to include, separated by commas.
`parameters` | Object | `WebMapServiceImageryProvider.DefaultParameters` | optional Additional parameters to pass to the WMS server in the GetMap URL.
`getFeatureInfoParameters` | Object | `WebMapServiceImageryProvider.GetFeatureInfoDefaultParameters` | optional Additional parameters to pass to the WMS server in the GetFeatureInfo URL.

`enablePickFeatures`

Boolean

`true`

optional If true, `WebMapServiceImageryProvider#pickFeatures` will invoke the GetFeatureInfo operation on the WMS server and return the features included in the response. If false, `WebMapServiceImageryProvider#pickFeatures` will immediately return undefined (indicating no pickable features) without communicating with the server. Set this property to false if you know your WMS server does not support GetFeatureInfo or if you don't want this provider's features to be pickable. Note that this can be dynamically overridden by modifying the WebMapServiceImageryProvider#enablePickFeatures property.

`getFeatureInfoFormats` | Array.<GetFeatureInfoFormat> | `WebMapServiceImageryProvider.DefaultGetFeatureInfoFormats` | optional The formats in which to try WMS GetFeatureInfo requests.
`rectangle` | Rectangle | `Rectangle.MAX_VALUE` | optional The rectangle of the layer.
`tilingScheme` | TilingScheme | `new GeographicTilingScheme()` | optional The tiling scheme to use to divide the world into tiles.
`ellipsoid` | Ellipsoid |  | optional The ellipsoid. If the tilingScheme is specified, this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither parameter is specified, the WGS84 ellipsoid is used.
`tileWidth` | Number | `256` | optional The width of each tile in pixels.
`tileHeight` | Number | `256` | optional The height of each tile in pixels.
`minimumLevel` | Number | `0` | optional The minimum level-of-detail supported by the imagery provider. Take care when specifying this that the number of tiles at the minimum level is small, such as four or less. A larger number is likely to result in rendering problems.
`maximumLevel` | Number |  | optional The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit. If not specified, there is no limit.
`crs` | String |  | optional CRS specification, for use with WMS specification >= 1.3.0.
`srs` | String |  | optional SRS specification, for use with WMS specification 1.1.0 or 1.1.1
`credit` | Credit | String |  | optional A credit for the data source, which is displayed on the canvas.
`subdomains` | String | Array.<String> | `'abc'` | optional The subdomains to use for the `{s}` placeholder in the URL template. If this parameter is a single string, each character in the string is a subdomain. If it is an array, each element in the array is a subdomain.
`clock` | Clock |  | optional A Clock instance that is used when determining the value for the time dimension. Required when options.times is specified.
`times` | TimeIntervalCollection |  | optional TimeIntervalCollection with its data property being an object containing time dynamic dimension and their values.
`proxy` | proxy |  | optional 代理

##### Example:

    var provider = new Cesium.WebMapServiceImageryProvider({
        url : 'https://sampleserver1.arcgisonline.com/ArcGIS/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/WMSServer',
        layers : '0',
        proxy: new Cesium.DefaultProxy('/proxy/')
    });

    viewer.imageryLayers.addImageryProvider(provider);

##### See:

- ArcGisMapServerImageryProvider
- BingMapsImageryProvider
- GoogleEarthEnterpriseMapsProvider
- createOpenStreetMapImageryProvider
- SingleTileImageryProvider
- createTileMapServiceImageryProvider
- WebMapTileServiceImageryProvider
- UrlTemplateImageryProvider
- ArcGIS Server REST API
- Cross-Origin Resource Sharing

### Members

#### static constantCesium.WebMapServiceImageryProvider.DefaultParameters : Object
Scene/WebMapServiceImageryProvider.js 542

The default parameters to include in the WMS URL to obtain images. The values are as follows: service=WMS version=1.1.1 request=GetMap styles= format=image/jpeg

#### static constantCesium.WebMapServiceImageryProvider.GetFeatureInfoDefaultParameters : Object
Scene/WebMapServiceImageryProvider.js 559

The default parameters to include in the WMS URL to get feature information. The values are as follows: service=WMS version=1.1.1 request=GetFeatureInfo

#### clock : Clock
Scene/WebMapServiceImageryProvider.js 430

Gets or sets a clock that is used to get keep the time used for time dynamic parameters.

#### readonlycredit : Credit
Scene/WebMapServiceImageryProvider.js 384

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 `WebMapServiceImageryProvider#ready` returns true.

#### enablePickFeatures : Boolean
Scene/WebMapServiceImageryProvider.js 416

Gets or sets a value indicating whether feature picking is enabled. If true, `WebMapServiceImageryProvider#pickFeatures` will invoke the `GetFeatureInfo` service on the WMS server and attempt to interpret the features included in the response. If false, `WebMapServiceImageryProvider#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.

Default Value: `true`

#### readonlyerrorEvent : Event
Scene/WebMapServiceImageryProvider.js 347

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/WebMapServiceImageryProvider.js 400

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.

#### readonlylayers : String
Scene/WebMapServiceImageryProvider.js 240

Gets the names of the WMS layers, separated by commas.

#### readonlymaximumLevel : Number
Scene/WebMapServiceImageryProvider.js 279

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

#### readonlyminimumLevel : Number
Scene/WebMapServiceImageryProvider.js 292

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

#### readonlyproxy : Proxy
Scene/WebMapServiceImageryProvider.js 228

Gets the proxy used by this provider.

#### readonlyready : Boolean
Scene/WebMapServiceImageryProvider.js 359

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

#### readonlyreadyPromise : Promise.<Boolean>
Scene/WebMapServiceImageryProvider.js 371

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

#### readonlyrectangle : Rectangle
Scene/WebMapServiceImageryProvider.js 318

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

#### readonlytileDiscardPolicy : TileDiscardPolicy
Scene/WebMapServiceImageryProvider.js 333

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 `WebMapServiceImageryProvider#ready` returns true.

#### readonlytileHeight : Number
Scene/WebMapServiceImageryProvider.js 266

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

#### readonlytileWidth : Number
Scene/WebMapServiceImageryProvider.js 253

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

#### readonlytilingScheme : TilingScheme
Scene/WebMapServiceImageryProvider.js 305

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

#### times : TimeIntervalCollection
Scene/WebMapServiceImageryProvider.js 445

Gets or sets a time interval collection that is used to get time dynamic parameters. The data of each TimeInterval is an object containing the keys and values of the properties that are used during tile requests.

#### readonlyurl : String
Scene/WebMapServiceImageryProvider.js 216

Gets the URL of the WMS server.

### Methods

#### getTileCredits(x, y, level) → Array.<Credit>
Scene/WebMapServiceImageryProvider.js 465

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/WebMapServiceImageryProvider.js 524

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.

##### Throws:

- DeveloperError : `pickFeatures` must not be called before the imagery provider is ready.

#### requestImage(x, y, level, request) → Promise.<(Image|Canvas)>|undefined
Scene/WebMapServiceImageryProvider.js 484

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