With these layers downloaded, you can combine them with the base reflectivity image to produce a more easily readable image map.

下载了这些图层之后，您可以把它们与基本反射率图像结合起来生成更易于阅读的图像地图。

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Now add your base layers to the map.

现在，将基础层添加到地图。

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A map in OpenLayers consists of a base layer and (optionally) several overlay (or non-base) layers.

OpenLayers内的一个地图包含了一个基础层和(可选地)几个叠加层(或非基础)层。

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