Change what counts as a Bing Imagery session

[lilleyse]

Some ion users may see a high number of Bing Imagery sessions despite not using Bing as their base layer. This can happen even if:

• An imagery layer is added on top of Bing. Bing tiles are still requested just not visible underneath the new layer: Imagery tiles requested when hidden behind other imagery #7728
• The default imagery layer (Bing) is removed and another imagery layer is added.

var viewer = new Cesium.Viewer('cesiumContainer');
viewer.imageryLayers.removeAll(false);
viewer.imageryLayers.addImageryProvider(Cesium.createTileMapServiceImageryProvider({
    url : Cesium.buildModuleUrl('Assets/Textures/NaturalEarthII')
}));

Viewer still creates a BingMapsImageryProvider under the hood which is enough to start the session. Is it possible to start the session only when the first tile is requested, or add a delay of some kind?

For anyone running into this problem, the best way to bypass Bing entirely is to pass the imagery provider to the viewer directly:

var viewer = new Cesium.Viewer('cesiumContainer', {
    imageryProvider : Cesium.createTileMapServiceImageryProvider({
        url : Cesium.buildModuleUrl('Assets/Textures/NaturalEarthII')
    })
});

[hpinkos]

Fixed in #7848