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| | | | | | | Exercises using LEOWorks
Invertion
Thermal infrared images measure the radiation from the surfaces of the Earth. Clouds can be seen very well. The surface of a cloud is cooler than the earth's surface. That is why clouds reflect less radiation.
The infrared images are inverted so that clouds look white as in nature. This means that cold regions appear light-coloured, while warm ones appear dark. Therefore the infrared images are inverted. But what does that mean? How would an uninverted infrared image look?
Open the LEOWorks programme . If you have not downloaded the weather images yet, do so now.
Choose File>Open. A dialogue box will pop up. Choose the folder Weather and select the image Meteosat_020331_12ir.jpg. This image was acquired at 12.00 UTC on 31 March 2002.
Choose Image>Invert. The image will change.
Open the original image again. Choose File>Open. A dialogue box will pop up. Choose the folder Weather and select the image Meteosat_020331_12ir.jpg.
Compare the inverted image with the original image and explain the differences.
| | | Clouds in the summer |
Climate, seasons, and vegetation
The following exercises require the use of the LEOWorks software. The LEOWorks programme has been developed by ESA and can be downloaded by clicking on the link on the right.
The different climates of Africa show variations in the allocation of humid and arid months, as well as in the fluctuation of temperature. There are regions without humidity, without aridity, with one rainy season in summer or in winter, or with two rainy seasons.
These differences can be seen by comparing the Meteosat images taken in different seasons, and thematic maps.
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