Cesium JS API
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GoogleEarthEnterpriseImageryProvider

GoogleEarthEnterpriseImageryProvider是一个Cesiumjs的ImageryProvider模块,它用于加载Google Earth Enterprise服务器上的瓦片图像数据。这为用户提供了一种在Cesium中轻松导入GEE图像数据的方式。

构造函数

创建GoogleEarthEnterpriseImageryProvider对象的构造函数如下:

new Cesium.GoogleEarthEnterpriseImageryProvider(options);

其中options是一个包含以下属性的对象:

属性名 类型 描述
url String Google Earth Enterprise 服务器的 URL。
metadataUrl String 一个 URL,指向有关GEE数据的元数据信息。
prettyErrorMessages Boolean 是否显示错误信息。默认为false
layers Array 包含要加载的数据层的名称的字符串数组。如果未指定,则将加载所有可用图层。
tileDiscardPolicy TileDiscardPolicy 磁贴丢弃策略对象。默认情况下不应该指定。
maximumLevel Number 加载的最大图层级别。
minimumLevel Number 加载的最小图层级别。
rectangle Rectangle 覆盖在地球上的矩形。
credit Credit 显示在地图画布上的信誉信息。
tilingScheme TilingScheme 磁贴方案。
subdomains String or Array 磁贴的子域名列表。
proxy Proxy 加载磁贴时使用的代理。
ellipsoid Ellipsoid 椭圆体。

示例

加载GEE服务器上my-imagery图层的代码如下:

var geeProvider = new Cesium.GoogleEarthEnterpriseImageryProvider({
    url : 'http://my-gee-server.com/',
    metadataUrl: 'http://my-gee-server.com/metadata.json',
    layers: ['my-imagery']
});

viewer.imageryLayers.addImageryProvider(geeProvider);

属性

hasAlphaChannel : Boolean

如果服务器提供的数据包含alpha通道,则为true。

credit : Credit

在画布上显示的信誉信息。

tileHeight : Number

每个瓷砖在垂直方向上的像素数。

tileWidth : Number

每个瓷砖在水平方向上的像素数。

maximumLevel : Number

可加载的最大图层级别。

minimumLevel : Number

可加载的最小图层级别。

rectangle : Rectangle

覆盖在地球上的矩形。

tilingScheme : TilingScheme

用于瓦片编号和坐标系的方案。

ellipsoid : Ellipsoid

地球体。

方法

getTileCredits(x, y, level) : Array

在给定的瓷砖位置和级别返回信誉数组。

requestImage(x, y, level, request) : Promise

按要求请求图像数据。返回一个Promise对象。

事件

errorEvent : Event

当加载时出错时触发的错误事件。

tilesLoaded : Event

当所有可见瓷砖都成功加载时触发。

参见