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