UrlTemplateImageryProvider
查阅Mars3D API

new Cesium.UrlTemplateImageryProvider(options)
engine/Source/Scene/UrlTemplateImageryProvider.js 189

Provides imagery by requesting tiles using a specified URL template.
参数名称 类型 描述信息
options UrlTemplateImageryProvider.ConstructorOptions Object describing initialization options
使用示例:
// Access Natural Earth II imagery, which uses a TMS tiling scheme and Geographic (EPSG:4326) project
const tms = new Cesium.UrlTemplateImageryProvider({
    url : Cesium.buildModuleUrl('Assets/Textures/NaturalEarthII') + '/{z}/{x}/{reverseY}.jpg',
    tilingScheme : new Cesium.GeographicTilingScheme(),
    maximumLevel : 5
});
// Access the CartoDB Positron basemap, which uses an OpenStreetMap-like tiling scheme.
const positron = new Cesium.UrlTemplateImageryProvider({
    url : 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
    credit : 'Map tiles by CartoDB, under CC BY 3.0. Data by OpenStreetMap, under ODbL.'
});
// Access a Web Map Service (WMS) server.
const wms = new Cesium.UrlTemplateImageryProvider({
   url : 'https://services.ga.gov.au/gis/services/NM_Hydrology_and_Marine_Points/MapServer/WMSServer?' +
         'tiled=true&transparent=true&format=image%2Fpng&exceptions=application%2Fvnd.ogc.se_xml&' +
         'styles=&service=WMS&version=1.3.0&request=GetMap&' +
         'layers=Bores&crs=EPSG%3A3857&' +
         'bbox={westProjected}%2C{southProjected}%2C{eastProjected}%2C{northProjected}&' +
         'width=256&height=256',
   rectangle : Cesium.Rectangle.fromDegrees(95.0, -55.0, 170.0, -1.0)  // From GetCapabilities EX_GeographicBoundingBox
});
// Using custom tags in your template url.
const custom = new Cesium.UrlTemplateImageryProvider({
   url : 'https://yoururl/{Time}/{z}/{y}/{x}.png',
   customTags : {
       Time: function(imageryProvider, x, y, level) {
           return '20171231'
       }
   }
});
参考:

成员(属性)

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.
默认值: 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.
默认值: 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.

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.
默认值: 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.
默认值: undefined

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

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

readonly proxy : Proxy
engine/Source/Scene/UrlTemplateImageryProvider.js 361

Gets the proxy used by this provider.
默认值: undefined

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

Gets the rectangle, in radians, of the imagery provided by this instance.
默认值: 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.
默认值: undefined

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

Gets the height of each tile, in pixels.
默认值: 256

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

Gets the width of each tile, in pixels.
默认值: 256

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

Gets the tiling scheme used by this provider.
默认值: 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.

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.

方法

getTileCredits(x, y, level) → Array.<Credit>
engine/Source/Scene/UrlTemplateImageryProvider.js 514

Gets the credits to be displayed when a given tile is displayed.
参数名称 类型 描述信息
x number The tile X coordinate.
y number The tile Y coordinate.
level number The tile level;
返回值:
The credits to be displayed when the tile is displayed.

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.
参数名称 类型 描述信息
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.
返回值:
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.

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

参数名称 类型 描述信息
x number The tile X coordinate.
y number The tile Y coordinate.
level number The tile level.
request Request 可选 The request object. Intended for internal use only.
返回值:
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.

定义的类型

Cesium.UrlTemplateImageryProvider.ConstructorOptions
engine/Source/Scene/UrlTemplateImageryProvider.js 51

Initialization options for the UrlTemplateImageryProvider constructor
属性:
属性名称 类型 可选 默认值 描述信息
url Resource | string 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.
pickFeaturesUrl Resource | string <可选>
 The URL template to use to pick features. If this property is not specified, UrlTemplateImageryProvider#pickFeatures will immediately returned undefined, indicating no features picked. The URL template supports all of the keywords supported by the url parameter, 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.
urlSchemeZeroPadding object <可选>
 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 the passed object 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.
subdomains string | Array.<string> <可选>
 'abc' 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.
credit Credit | string <可选>
 '' A credit for the data source, which is displayed on the canvas.
minimumLevel number <可选>
 0 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 <可选>
 The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit.
rectangle Rectangle <可选>
 Rectangle.MAX_VALUE The rectangle, in radians, covered by the image.
tilingScheme TilingScheme <可选>
 WebMercatorTilingScheme The tiling scheme specifying how the ellipsoidal surface is broken into tiles. If this parameter is not provided, a WebMercatorTilingScheme is used.
ellipsoid Ellipsoid <可选>
 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 <可选>
 256 Pixel width of image tiles.
tileHeight number <可选>
 256 Pixel height of image tiles.
hasAlphaChannel boolean <可选>
 true true if the images provided by this imagery provider include an alpha channel; otherwise, false. 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 potentially reduced.
getFeatureInfoFormats Array.<GetFeatureInfoFormat> <可选>
 The formats in which to get feature information at a specific location when UrlTemplateImageryProvider#pickFeatures is invoked. If this parameter is not specified, feature picking is disabled.
enablePickFeatures boolean <可选>
 true If true, UrlTemplateImageryProvider#pickFeatures will request the 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. Note that this can be dynamically overridden by modifying the UriTemplateImageryProvider#enablePickFeatures property.
tileDiscardPolicy TileDiscardPolicy <可选>
 A policy for discarding tile images according to some criteria
customTags Object <可选>
 Allow to replace custom keywords in the URL template. The object must have strings as keys and functions as values.
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