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Meteorologists are making increasing use of information provided on photo websites by ordinary people. There was a presentation dealing with how they do this at a recent conference in New York. Scientists based at a university in Indiana looked at thousands of photos of snow scenes posted on line. These provided them with information about snow falls in areas where, because of heavy cloud cover, no information from satellite photography was available. It is not necessary to make use of this source of information as far as urban weather is concerned , as there is usually easy access to plenty of other data about towns. But photos taken by the public can be an excellent way of filling in the gaps in knowledge about weather events in more distant rural locations.