With your selected pixel coordinates and a single-layer base reflectivity map, the logical process for detecting precipitation near a spot on the map is straightforward.
使用选定的像素坐标和单层基本反射率图，检测地图中某个场所附近的降水的逻辑过程将十分简单。
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。
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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