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2022-07-05 16:56:29 +08:00
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ImageryProvider - Cesium Documentation</title>
<!--[if lt IE 9]>
<script src="javascript/html5.js"></script>
<![endif]-->
<link href="styles/jsdoc-default.css" rel="stylesheet">
<link href="styles/prism.css" rel="stylesheet">
</head>
<body>
<div id="main">
<h1 class="page-title">
<a href="index.html"><img src="Images/CesiumLogo.png" class="cesiumLogo"></a>
ImageryProvider
<div class="titleCenterer"></div>
</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="nameContainer">
<h4 class="name" id="ImageryProvider">
<a href="#ImageryProvider" class="doc-link"></a>
<span class="type-signature attribute-abstract">abstract</span> new Cesium.ImageryProvider<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L34">Scene/ImageryProvider.js 34</a>
</div>
</h4>
</div>
<div class="description">
Provides imagery to be displayed on the surface of an ellipsoid. This type describes an
interface and is not intended to be instantiated directly.
</div>
<dl class="details">
<h5>Demo:</h5>
<ul class="see-list">
<li><a href="https://sandcastle.cesium.com/index.html?src=Imagery%2520Layers.html">Cesium Sandcastle Imagery Layers Demo</a></li>
<li><a href="https://sandcastle.cesium.com/index.html?src=Imagery%2520Layers%2520Manipulation.html">Cesium Sandcastle Imagery Manipulation Demo</a></li>
</ul>
<h5>See:</h5>
<ul class="see-list">
<li><a href="ArcGisMapServerImageryProvider.html">ArcGisMapServerImageryProvider</a></li>
<li><a href="BingMapsImageryProvider.html">BingMapsImageryProvider</a></li>
<li><a href="OpenStreetMapImageryProvider.html">OpenStreetMapImageryProvider</a></li>
<li><a href="TileMapServiceImageryProvider.html">TileMapServiceImageryProvider</a></li>
<li><a href="GoogleEarthEnterpriseImageryProvider.html">GoogleEarthEnterpriseImageryProvider</a></li>
<li><a href="GoogleEarthEnterpriseMapsProvider.html">GoogleEarthEnterpriseMapsProvider</a></li>
<li><a href="GridImageryProvider.html">GridImageryProvider</a></li>
<li><a href="IonImageryProvider.html">IonImageryProvider</a></li>
<li><a href="MapboxImageryProvider.html">MapboxImageryProvider</a></li>
<li><a href="MapboxStyleImageryProvider.html">MapboxStyleImageryProvider</a></li>
<li><a href="SingleTileImageryProvider.html">SingleTileImageryProvider</a></li>
<li><a href="TileCoordinatesImageryProvider.html">TileCoordinatesImageryProvider</a></li>
<li><a href="UrlTemplateImageryProvider.html">UrlTemplateImageryProvider</a></li>
<li><a href="WebMapServiceImageryProvider.html">WebMapServiceImageryProvider</a></li>
<li><a href="WebMapTileServiceImageryProvider.html">WebMapTileServiceImageryProvider</a></li>
</ul>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<div class="nameContainer">
<h4 class="name" id="credit">
<a href="#credit" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> credit<span class="type-signature"> : <a href="Credit.html">Credit</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L248">Scene/ImageryProvider.js 248</a>
</div>
</h4>
</div>
<div class="description">
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 <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultAlpha">
<a href="#defaultAlpha" class="doc-link"></a>
defaultAlpha<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L42">Scene/ImageryProvider.js 42</a>
</div>
</h4>
</div>
<div class="description">
The default alpha blending value of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultBrightness">
<a href="#defaultBrightness" class="doc-link"></a>
defaultBrightness<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L69">Scene/ImageryProvider.js 69</a>
</div>
</h4>
</div>
<div class="description">
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.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultContrast">
<a href="#defaultContrast" class="doc-link"></a>
defaultContrast<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L78">Scene/ImageryProvider.js 78</a>
</div>
</h4>
</div>
<div class="description">
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.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultDayAlpha">
<a href="#defaultDayAlpha" class="doc-link"></a>
defaultDayAlpha<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L60">Scene/ImageryProvider.js 60</a>
</div>
</h4>
</div>
<div class="description">
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.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultGamma">
<a href="#defaultGamma" class="doc-link"></a>
defaultGamma<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L103">Scene/ImageryProvider.js 103</a>
</div>
</h4>
</div>
<div class="description">
The default gamma correction to apply to this provider. 1.0 uses the unmodified imagery color.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultHue">
<a href="#defaultHue" class="doc-link"></a>
defaultHue<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L86">Scene/ImageryProvider.js 86</a>
</div>
</h4>
</div>
<div class="description">
The default hue of this provider in radians. 0.0 uses the unmodified imagery color.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultMagnificationFilter">
<a href="#defaultMagnificationFilter" class="doc-link"></a>
defaultMagnificationFilter<span class="type-signature"> : <a href="global.html#TextureMagnificationFilter">TextureMagnificationFilter</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L119">Scene/ImageryProvider.js 119</a>
</div>
</h4>
</div>
<div class="description">
The default texture magnification filter to apply to this provider.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultMinificationFilter">
<a href="#defaultMinificationFilter" class="doc-link"></a>
defaultMinificationFilter<span class="type-signature"> : <a href="global.html#TextureMinificationFilter">TextureMinificationFilter</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L111">Scene/ImageryProvider.js 111</a>
</div>
</h4>
</div>
<div class="description">
The default texture minification filter to apply to this provider.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultNightAlpha">
<a href="#defaultNightAlpha" class="doc-link"></a>
defaultNightAlpha<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L51">Scene/ImageryProvider.js 51</a>
</div>
</h4>
</div>
<div class="description">
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.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="defaultSaturation">
<a href="#defaultSaturation" class="doc-link"></a>
defaultSaturation<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L95">Scene/ImageryProvider.js 95</a>
</div>
</h4>
</div>
<div class="description">
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.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="errorEvent">
<a href="#errorEvent" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> errorEvent<span class="type-signature"> : <a href="Event.html">Event</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L236">Scene/ImageryProvider.js 236</a>
</div>
</h4>
</div>
<div class="description">
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 <a href="TileProviderError.html"><code>TileProviderError</code></a>.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="hasAlphaChannel">
<a href="#hasAlphaChannel" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> hasAlphaChannel<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L272">Scene/ImageryProvider.js 272</a>
</div>
</h4>
</div>
<div class="description">
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.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="maximumLevel">
<a href="#maximumLevel" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> maximumLevel<span class="type-signature"> : Number|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L185">Scene/ImageryProvider.js 185</a>
</div>
</h4>
</div>
<div class="description">
Gets the maximum level-of-detail that can be requested. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="minimumLevel">
<a href="#minimumLevel" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> minimumLevel<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L200">Scene/ImageryProvider.js 200</a>
</div>
</h4>
</div>
<div class="description">
Gets the minimum level-of-detail that can be requested. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true. Generally,
a minimum level should only be used when the rectangle of the imagery is small
enough that the number of tiles at the minimum level is small. An imagery
provider with more than a few tiles at the minimum level will lead to
rendering problems.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="proxy">
<a href="#proxy" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> proxy<span class="type-signature"> : <a href="Proxy.html">Proxy</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L258">Scene/ImageryProvider.js 258</a>
</div>
</h4>
</div>
<div class="description">
Gets the proxy used by this provider.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="ready">
<a href="#ready" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> ready<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L131">Scene/ImageryProvider.js 131</a>
</div>
</h4>
</div>
<div class="description">
Gets a value indicating whether or not the provider is ready for use.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="readyPromise">
<a href="#readyPromise" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> readyPromise<span class="type-signature"> : Promise.&lt;Boolean></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L141">Scene/ImageryProvider.js 141</a>
</div>
</h4>
</div>
<div class="description">
Gets a promise that resolves to true when the provider is ready for use.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="rectangle">
<a href="#rectangle" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> rectangle<span class="type-signature"> : <a href="Rectangle.html">Rectangle</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L152">Scene/ImageryProvider.js 152</a>
</div>
</h4>
</div>
<div class="description">
Gets the rectangle, in radians, of the imagery provided by the instance. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileDiscardPolicy">
<a href="#tileDiscardPolicy" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> tileDiscardPolicy<span class="type-signature"> : <a href="TileDiscardPolicy.html">TileDiscardPolicy</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L224">Scene/ImageryProvider.js 224</a>
</div>
</h4>
</div>
<div class="description">
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 <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileHeight">
<a href="#tileHeight" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> tileHeight<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L174">Scene/ImageryProvider.js 174</a>
</div>
</h4>
</div>
<div class="description">
Gets the height of each tile, in pixels. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileWidth">
<a href="#tileWidth" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> tileWidth<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L163">Scene/ImageryProvider.js 163</a>
</div>
</h4>
</div>
<div class="description">
Gets the width of each tile, in pixels. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tilingScheme">
<a href="#tilingScheme" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span> tilingScheme<span class="type-signature"> : <a href="TilingScheme.html">TilingScheme</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L211">Scene/ImageryProvider.js 211</a>
</div>
</h4>
</div>
<div class="description">
Gets the tiling scheme used by the provider. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<h3 class="subsection-title">Methods</h3>
<div class="nameContainer">
<h4 class="name" id=".loadImage">
<a href="#.loadImage" class="doc-link"></a>
<span class="type-signature attribute-static">static</span> Cesium.ImageryProvider.loadImage<span class="signature">(imageryProvider, url)</span> &rarr; <span class="type-signature returnType">Promise.&lt;(HTMLImageElement|HTMLCanvasElement)>|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L353">Scene/ImageryProvider.js 353</a>
</div>
</h4>
</div>
<div class="description">
Loads an image from a given URL. If the server referenced by the URL already has
too many requests pending, this function will instead return undefined, indicating
that the request should be retried later.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>imageryProvider</code></td>
<td class="type">
<span class="param-type"><a href="ImageryProvider.html">ImageryProvider</a></span>
</td>
<td class="description last">
The imagery provider for the URL.</td>
</tr>
<tr>
<td class="name"><code>url</code></td>
<td class="type">
<span class="param-type"><a href="Resource.html">Resource</a></span>
|
<span class="param-type">String</span>
</td>
<td class="description last">
The URL of the image.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
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.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="getTileCredits">
<a href="#getTileCredits" class="doc-link"></a>
getTileCredits<span class="signature">(x, y, level)</span> &rarr; <span class="type-signature returnType">Array.&lt;<a href="Credit.html">Credit</a>></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L287">Scene/ImageryProvider.js 287</a>
</div>
</h4>
</div>
<div class="description">
Gets the credits to be displayed when a given tile is displayed.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>x</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile X coordinate.</td>
</tr>
<tr>
<td class="name"><code>y</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile Y coordinate.</td>
</tr>
<tr>
<td class="name"><code>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile level;</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The credits to be displayed when the tile is displayed.
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: <code>getTileCredits</code> must not be called before the imagery provider is ready.
</div>
</li>
</ul>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="pickFeatures">
<a href="#pickFeatures" class="doc-link"></a>
pickFeatures<span class="signature">(x, y, level, longitude, latitude)</span> &rarr; <span class="type-signature returnType">Promise.&lt;Array.&lt;<a href="ImageryLayerFeatureInfo.html">ImageryLayerFeatureInfo</a>>>|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L329">Scene/ImageryProvider.js 329</a>
</div>
</h4>
</div>
<div class="description">
Asynchronously determines what features, if any, are located at a given longitude and latitude within
a tile. This function should not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
This function is optional, so it may not exist on all ImageryProviders.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>x</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile X coordinate.</td>
</tr>
<tr>
<td class="name"><code>y</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile Y coordinate.</td>
</tr>
<tr>
<td class="name"><code>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile level.</td>
</tr>
<tr>
<td class="name"><code>longitude</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The longitude at which to pick features.</td>
</tr>
<tr>
<td class="name"><code>latitude</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The latitude at which to pick features.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
A promise for the picked features that will resolve when the asynchronous
picking completes. The resolved value is an array of <a href="ImageryLayerFeatureInfo.html"><code>ImageryLayerFeatureInfo</code></a>
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.
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: <code>pickFeatures</code> must not be called before the imagery provider is ready.
</div>
</li>
</ul>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="requestImage">
<a href="#requestImage" class="doc-link"></a>
requestImage<span class="signature">(x, y, level, <span class="optional">request</span>)</span> &rarr; <span class="type-signature returnType">Promise.&lt;(HTMLImageElement|HTMLCanvasElement)>|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/ImageryProvider.js#L306">Scene/ImageryProvider.js 306</a>
</div>
</h4>
</div>
<div class="description">
Requests the image for a given tile. This function should
not be called before <a href="ImageryProvider.html#ready"><code>ImageryProvider#ready</code></a> returns true.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>x</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile X coordinate.</td>
</tr>
<tr>
<td class="name"><code>y</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile Y coordinate.</td>
</tr>
<tr>
<td class="name"><code>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile level.</td>
</tr>
<tr>
<td class="name"><code>request</code></td>
<td class="type">
<span class="param-type"><a href="Request.html">Request</a></span>
</td>
<td class="description last">
<span class="optional">optional</span>
The request object. Intended for internal use only.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
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.
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: <code>requestImage</code> must not be called before the imagery provider is ready.
</div>
</li>
</ul>
<dl class="details">
</dl>
</article>
</section>
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