The cloud image is a composite of two days of imagery collected in visible light wavelengths and a third day of thermal infra-red imagery over the poles.

两天的可见光影像采集和一天的红外光极地影像采集的数据合成了云层影像。

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The Google Earth Engine – a cloud computing platform – processes real-time satellite imagery and other Earth observation data.

Google Earth引擎是一个云计算平台，可实时处理卫星图像及其他观测数据。

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Based on satellite imagery data collected between 2000 and 2013, the index measures three different factors: air temperature, water availability, and degree of cloud cover.

这一指数以2000年到2013年之间收集的卫星图像数据为依据，测量了三种不同的因素：气温，水资源可利用量和云层覆盖度。

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The Natural Environment Research Council (NERC) has sent up a reconnaissance flight to investigate how the ash is distributed in the cloud, something that is impossible to assess from satellite imagery.

BBC: Icelandic volcanic ash alert grounds UK flights