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i have imagery with high resolution .5m, large parts covered with clouds,so it's obscure many urban areas. thank you.

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wait for a clear day and the satellite to make a second pass. could be many months even years. –  Mapperz Sep 27 '12 at 15:26
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up vote 11 down vote accepted

You can't 'remove' clouds from optical imagery, what you see is what you get; they are photographs and there is no optical data recorded from below the clouds in the same way that there is no data underneath building roofs.

If you use remote sensing data of a longer wavelength than light such as microwave, the water particles in the clouds do not absorb the energy from the sensor, but this type of platform is typically of a lower spatial resolution than optical imagery, and is consequently used for different tasks, such as soil moisture estimation and surface roughness estimation.

The only solution as such is to try to find a satellite pass without clouds and combine all the clear segments of your study area to make a full clear coverage.

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thank you very much @sgrieve for this guidelines and the clarity. –  GIS Man Sep 27 '12 at 15:36
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