As well as camera images, Polar-orbiting weather satellites carry a range of instruments constantly coughing out data and most of this deluge of data comes pouring into my PC in one form or another. The rather smart HRPT Reader software from David Taylor can then produce not just pretty pictures but also Sea Surface Temperature analysis, fire data, water vapour and, as in the image below, vegetation data.

Below we can see the fertile tract along the course of the Nile and the Nile Delta (showing in red)