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      <title>Cesium BaseLayerPicker 接入天地图高德：坐标偏移、Token 与合规全流程</title>
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      <description>Cesium Viewer 的 BaseLayerPicker 控件默认只展示 Bing Maps 等选项，开发者若要切换天地图或高德地图，必须手动注册 ImageryProvider 并处理坐标偏移与 token 合规。信号显示该控件一行配置即可切换，但国产地图接入远不止于此。 BaseLayerPicker 默认仅加载国外底图服务 Cesium 官方 Viewer 实例在初始化时会自动挂载 BaseLayerPicker 控件。该控件在界面右上角以图标形式呈现，点击后弹出底图选择面</description>
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