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WebMapTileServiceImageryProvider.js
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WebMapTileServiceImageryProvider.js
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define([
'../Core/combine',
'../Core/Credit',
'../Core/defaultValue',
'../Core/defined',
'../Core/defineProperties',
'../Core/DeveloperError',
'../Core/Event',
'../Core/freezeObject',
'../Core/isArray',
'../Core/Rectangle',
'../Core/Resource',
'../Core/WebMercatorTilingScheme',
'../ThirdParty/when',
'./ImageryProvider',
'./TimeDynamicImagery'
], function(
combine,
Credit,
defaultValue,
defined,
defineProperties,
DeveloperError,
Event,
freezeObject,
isArray,
Rectangle,
Resource,
WebMercatorTilingScheme,
when,
ImageryProvider,
TimeDynamicImagery) {
'use strict';
var defaultParameters = freezeObject({
service : 'WMTS',
version : '1.0.0',
request : 'GetTile'
});
/**
* Provides tiled imagery served by {@link http://www.opengeospatial.org/standards/wmts|WMTS 1.0.0} compliant servers.
* This provider supports HTTP KVP-encoded and RESTful GetTile requests, but does not yet support the SOAP encoding.
*
* @alias WebMapTileServiceImageryProvider
* @constructor
*
* @param {Object} options Object with the following properties:
* @param {Resource|String} options.url The base URL for the WMTS GetTile operation (for KVP-encoded requests) or the tile-URL template (for RESTful requests). The tile-URL template should contain the following variables: {style}, {TileMatrixSet}, {TileMatrix}, {TileRow}, {TileCol}. The first two are optional if actual values are hardcoded or not required by the server. The {s} keyword may be used to specify subdomains.
* @param {String} [options.format='image/jpeg'] The MIME type for images to retrieve from the server.
* @param {String} options.layer The layer name for WMTS requests.
* @param {String} options.style The style name for WMTS requests.
* @param {String} options.tileMatrixSetID The identifier of the TileMatrixSet to use for WMTS requests.
* @param {Array} [options.tileMatrixLabels] A list of identifiers in the TileMatrix to use for WMTS requests, one per TileMatrix level.
* @param {Clock} [options.clock] A Clock instance that is used when determining the value for the time dimension. Required when options.times is specified.
* @param {TimeIntervalCollection} [options.times] TimeIntervalCollection with its data property being an object containing time dynamic dimension and their values.
* @param {Object} [options.dimensions] A object containing static dimensions and their values.
* @param {Number} [options.tileWidth=256] The tile width in pixels.
* @param {Number} [options.tileHeight=256] The tile height in pixels.
* @param {TilingScheme} [options.tilingScheme] The tiling scheme corresponding to the organization of the tiles in the TileMatrixSet.
* @param {Rectangle} [options.rectangle=Rectangle.MAX_VALUE] The rectangle covered by the layer.
* @param {Number} [options.minimumLevel=0] The minimum level-of-detail supported by the imagery provider.
* @param {Number} [options.maximumLevel] The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit.
* @param {Ellipsoid} [options.ellipsoid] The ellipsoid. If not specified, the WGS84 ellipsoid is used.
* @param {Credit|String} [options.credit] A credit for the data source, which is displayed on the canvas.
* @param {String|String[]} [options.subdomains='abc'] The subdomains to use for the <code>{s}</code> 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.
*
* @demo {@link https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Web%20Map%20Tile%20Service%20with%20Time.html|Cesium Sandcastle Web Map Tile Service with Time Demo}
*
* @example
* // Example 1. USGS shaded relief tiles (KVP)
* var shadedRelief1 = new Cesium.WebMapTileServiceImageryProvider({
* url : 'http://basemap.nationalmap.gov/arcgis/rest/services/USGSShadedReliefOnly/MapServer/WMTS',
* layer : 'USGSShadedReliefOnly',
* style : 'default',
* format : 'image/jpeg',
* tileMatrixSetID : 'default028mm',
* // tileMatrixLabels : ['default028mm:0', 'default028mm:1', 'default028mm:2' ...],
* maximumLevel: 19,
* credit : new Cesium.Credit('U. S. Geological Survey')
* });
* viewer.imageryLayers.addImageryProvider(shadedRelief1);
*
* @example
* // Example 2. USGS shaded relief tiles (RESTful)
* var shadedRelief2 = new Cesium.WebMapTileServiceImageryProvider({
* url : 'http://basemap.nationalmap.gov/arcgis/rest/services/USGSShadedReliefOnly/MapServer/WMTS/tile/1.0.0/USGSShadedReliefOnly/{Style}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}.jpg',
* layer : 'USGSShadedReliefOnly',
* style : 'default',
* format : 'image/jpeg',
* tileMatrixSetID : 'default028mm',
* maximumLevel: 19,
* credit : new Cesium.Credit('U. S. Geological Survey')
* });
* viewer.imageryLayers.addImageryProvider(shadedRelief2);
*
* @example
* // Example 3. NASA time dynamic weather data (RESTful)
* var times = Cesium.TimeIntervalCollection.fromIso8601({
* iso8601: '2015-07-30/2017-06-16/P1D',
* dataCallback: function dataCallback(interval, index) {
* return {
* Time: Cesium.JulianDate.toIso8601(interval.start)
* };
* }
* });
* var weather = new Cesium.WebMapTileServiceImageryProvider({
* url : 'https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/AMSR2_Snow_Water_Equivalent/default/{Time}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}.png',
* layer : 'AMSR2_Snow_Water_Equivalent',
* style : 'default',
* tileMatrixSetID : '2km',
* maximumLevel : 5,
* format : 'image/png',
* clock: clock,
* times: times,
* credit : new Cesium.Credit('NASA Global Imagery Browse Services for EOSDIS')
* });
* viewer.imageryLayers.addImageryProvider(weather);
*
* @see ArcGisMapServerImageryProvider
* @see BingMapsImageryProvider
* @see GoogleEarthEnterpriseMapsProvider
* @see createOpenStreetMapImageryProvider
* @see SingleTileImageryProvider
* @see createTileMapServiceImageryProvider
* @see WebMapServiceImageryProvider
* @see UrlTemplateImageryProvider
*/
function WebMapTileServiceImageryProvider(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
//>>includeStart('debug', pragmas.debug);
if (!defined(options.url)) {
throw new DeveloperError('options.url is required.');
}
if (!defined(options.layer)) {
throw new DeveloperError('options.layer is required.');
}
if (!defined(options.style)) {
throw new DeveloperError('options.style is required.');
}
if (!defined(options.tileMatrixSetID)) {
throw new DeveloperError('options.tileMatrixSetID is required.');
}
if (defined(options.times) && !defined(options.clock)) {
throw new DeveloperError('options.times was specified, so options.clock is required.');
}
//>>includeEnd('debug');
var resource = Resource.createIfNeeded(options.url);
var style = options.style;
var tileMatrixSetID = options.tileMatrixSetID;
var url = resource.url;
if (url.indexOf('{') >= 0) {
var templateValues = {
style : style,
Style : style,
TileMatrixSet : tileMatrixSetID
};
resource.setTemplateValues(templateValues);
this._useKvp = false;
} else {
resource.setQueryParameters(defaultParameters);
this._useKvp = true;
}
this._resource = resource;
this._layer = options.layer;
this._style = style;
this._tileMatrixSetID = tileMatrixSetID;
this._tileMatrixLabels = options.tileMatrixLabels;
this._format = defaultValue(options.format, 'image/jpeg');
this._tileDiscardPolicy = options.tileDiscardPolicy;
this._tilingScheme = defined(options.tilingScheme) ? options.tilingScheme : new WebMercatorTilingScheme({ellipsoid : options.ellipsoid});
this._tileWidth = defaultValue(options.tileWidth, 256);
this._tileHeight = defaultValue(options.tileHeight, 256);
this._minimumLevel = defaultValue(options.minimumLevel, 0);
this._maximumLevel = options.maximumLevel;
this._rectangle = defaultValue(options.rectangle, this._tilingScheme.rectangle);
this._dimensions = options.dimensions;
var that = this;
this._reload = undefined;
if (defined(options.times)) {
this._timeDynamicImagery = new TimeDynamicImagery({
clock : options.clock,
times : options.times,
requestImageFunction : function(x, y, level, request, interval) {
return requestImage(that, x, y, level, request, interval);
},
reloadFunction : function() {
if (defined(that._reload)) {
that._reload();
}
}
});
}
this._readyPromise = when.resolve(true);
// Check the number of tiles at the minimum level. If it's more than four,
// throw an exception, because starting at the higher minimum
// level will cause too many tiles to be downloaded and rendered.
var swTile = this._tilingScheme.positionToTileXY(Rectangle.southwest(this._rectangle), this._minimumLevel);
var neTile = this._tilingScheme.positionToTileXY(Rectangle.northeast(this._rectangle), this._minimumLevel);
var tileCount = (Math.abs(neTile.x - swTile.x) + 1) * (Math.abs(neTile.y - swTile.y) + 1);
//>>includeStart('debug', pragmas.debug);
if (tileCount > 4) {
throw new DeveloperError('The imagery provider\'s rectangle and minimumLevel indicate that there are ' + tileCount + ' tiles at the minimum level. Imagery providers with more than four tiles at the minimum level are not supported.');
}
//>>includeEnd('debug');
this._errorEvent = new Event();
var credit = options.credit;
this._credit = typeof credit === 'string' ? new Credit(credit) : credit;
this._subdomains = options.subdomains;
if (isArray(this._subdomains)) {
this._subdomains = this._subdomains.slice();
} else if (defined(this._subdomains) && this._subdomains.length > 0) {
this._subdomains = this._subdomains.split('');
} else {
this._subdomains = ['a', 'b', 'c'];
}
}
function requestImage(imageryProvider, col, row, level, request, interval) {
var labels = imageryProvider._tileMatrixLabels;
var tileMatrix = defined(labels) ? labels[level] : level.toString();
var subdomains = imageryProvider._subdomains;
var staticDimensions = imageryProvider._dimensions;
var dynamicIntervalData = defined(interval) ? interval.data : undefined;
var resource;
if (!imageryProvider._useKvp) {
var templateValues = {
TileMatrix: tileMatrix,
TileRow: row.toString(),
TileCol: col.toString(),
s: subdomains[(col + row + level) % subdomains.length]
};
resource = imageryProvider._resource.getDerivedResource({
request: request
});
resource.setTemplateValues(templateValues);
if (defined(staticDimensions)) {
resource.setTemplateValues(staticDimensions);
}
if (defined(dynamicIntervalData)) {
resource.setTemplateValues(dynamicIntervalData);
}
} else {
// build KVP request
var query = {};
query.tilematrix = tileMatrix;
query.layer = imageryProvider._layer;
query.style = imageryProvider._style;
query.tilerow = row;
query.tilecol = col;
query.tilematrixset = imageryProvider._tileMatrixSetID;
query.format = imageryProvider._format;
if (defined(staticDimensions)) {
query = combine(query, staticDimensions);
}
if (defined(dynamicIntervalData)) {
query = combine(query, dynamicIntervalData);
}
resource = imageryProvider._resource.getDerivedResource({
queryParameters: query,
request: request
});
}
return ImageryProvider.loadImage(imageryProvider, resource);
}
defineProperties(WebMapTileServiceImageryProvider.prototype, {
/**
* Gets the URL of the service hosting the imagery.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {String}
* @readonly
*/
url : {
get : function() {
return this._resource.url;
}
},
/**
* Gets the proxy used by this provider.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Proxy}
* @readonly
*/
proxy : {
get : function() {
return this._resource.proxy;
}
},
/**
* Gets the width of each tile, in pixels. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Number}
* @readonly
*/
tileWidth : {
get : function() {
return this._tileWidth;
}
},
/**
* Gets the height of each tile, in pixels. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Number}
* @readonly
*/
tileHeight : {
get : function() {
return this._tileHeight;
}
},
/**
* Gets the maximum level-of-detail that can be requested. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Number}
* @readonly
*/
maximumLevel : {
get : function() {
return this._maximumLevel;
}
},
/**
* Gets the minimum level-of-detail that can be requested. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Number}
* @readonly
*/
minimumLevel : {
get : function() {
return this._minimumLevel;
}
},
/**
* Gets the tiling scheme used by this provider. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {TilingScheme}
* @readonly
*/
tilingScheme : {
get : function() {
return this._tilingScheme;
}
},
/**
* Gets the rectangle, in radians, of the imagery provided by this instance. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Rectangle}
* @readonly
*/
rectangle : {
get : function() {
return this._rectangle;
}
},
/**
* 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 {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {TileDiscardPolicy}
* @readonly
*/
tileDiscardPolicy : {
get : function() {
return this._tileDiscardPolicy;
}
},
/**
* 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 {@link TileProviderError}.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Event}
* @readonly
*/
errorEvent : {
get : function() {
return this._errorEvent;
}
},
/**
* Gets the mime type of images returned by this imagery provider.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {String}
* @readonly
*/
format : {
get : function() {
return this._format;
}
},
/**
* Gets a value indicating whether or not the provider is ready for use.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Boolean}
* @readonly
*/
ready : {
value : true
},
/**
* Gets a promise that resolves to true when the provider is ready for use.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Promise.<Boolean>}
* @readonly
*/
readyPromise : {
get : function() {
return this._readyPromise;
}
},
/**
* 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 {@link WebMapTileServiceImageryProvider#ready} returns true.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Credit}
* @readonly
*/
credit : {
get : function() {
return this._credit;
}
},
/**
* 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.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Boolean}
* @readonly
*/
hasAlphaChannel : {
get : function() {
return true;
}
},
/**
* Gets or sets a clock that is used to get keep the time used for time dynamic parameters.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Clock}
*/
clock : {
get : function() {
return this._timeDynamicImagery.clock;
},
set : function(value) {
this._timeDynamicImagery.clock = value;
}
},
/**
* 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.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {TimeIntervalCollection}
*/
times : {
get : function() {
return this._timeDynamicImagery.times;
},
set : function(value) {
this._timeDynamicImagery.times = value;
}
},
/**
* Gets or sets an object that contains static dimensions and their values.
* @memberof WebMapTileServiceImageryProvider.prototype
* @type {Object}
*/
dimensions : {
get : function() {
return this._dimensions;
},
set : function(value) {
if (this._dimensions !== value) {
this._dimensions = value;
if (defined(this._reload)) {
this._reload();
}
}
}
}
});
/**
* Gets the credits to be displayed when a given tile is displayed.
*
* @param {Number} x The tile X coordinate.
* @param {Number} y The tile Y coordinate.
* @param {Number} level The tile level;
* @returns {Credit[]} The credits to be displayed when the tile is displayed.
*
* @exception {DeveloperError} <code>getTileCredits</code> must not be called before the imagery provider is ready.
*/
WebMapTileServiceImageryProvider.prototype.getTileCredits = function(x, y, level) {
return undefined;
};
/**
* Requests the image for a given tile. This function should
* not be called before {@link WebMapTileServiceImageryProvider#ready} returns true.
*
* @param {Number} x The tile X coordinate.
* @param {Number} y The tile Y coordinate.
* @param {Number} level The tile level.
* @param {Request} [request] The request object. Intended for internal use only.
* @returns {Promise.<Image|Canvas>|undefined} 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.
*
* @exception {DeveloperError} <code>requestImage</code> must not be called before the imagery provider is ready.
*/
WebMapTileServiceImageryProvider.prototype.requestImage = function(x, y, level, request) {
var result;
var timeDynamicImagery = this._timeDynamicImagery;
var currentInterval;
// Try and load from cache
if (defined(timeDynamicImagery)) {
currentInterval = timeDynamicImagery.currentInterval;
result = timeDynamicImagery.getFromCache(x, y, level, request);
}
// Couldn't load from cache
if (!defined(result)) {
result = requestImage(this, x, y, level, request, currentInterval);
}
// If we are approaching an interval, preload this tile in the next interval
if (defined(result) && defined(timeDynamicImagery)) {
timeDynamicImagery.checkApproachingInterval(x, y, level, request);
}
return result;
};
/**
* Picking features is not currently supported by this imagery provider, so this function simply returns
* undefined.
*
* @param {Number} x The tile X coordinate.
* @param {Number} y The tile Y coordinate.
* @param {Number} level The tile level.
* @param {Number} longitude The longitude at which to pick features.
* @param {Number} latitude The latitude at which to pick features.
* @return {Promise.<ImageryLayerFeatureInfo[]>|undefined} A promise for the picked features that will resolve when the asynchronous
* picking completes. The resolved value is an array of {@link 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.
*/
WebMapTileServiceImageryProvider.prototype.pickFeatures = function(x, y, level, longitude, latitude) {
return undefined;
};
return WebMapTileServiceImageryProvider;
});