Investigate DIGITAL TASK. Locate the Nile Delta on Bing or Google Maps. Select the satellite view. Zoom in on the image. What level of detail can you see? What elements of the terrain do you recognise? Form a hypothesis. How do you think this area will change in the future? E X P L O R E The use of technology in Geography Geographic Information Technology (GIT) is a set of methods and techniques that help us collect, organise and analyse geographic data . Today, these methods and techniques are essential , for example, when mapping and analysing geographic space. Satellite photographs Remote sensing is a technique for obtaining data about the Earth's surface from artificial satellites. Satellite photographs are digital . This means they are not continuous images, but instead consist of thousands of pixels (tiny squares of colour). This format produces high-definition images. The analysis of satellite photographs makes it possible to detect changes in the Earth's surface, to study natural disasters ( f loods, volcanic eruptions, etc.) and to monitor changes (the advance of deserts, differences in the hole in the ozone layer, the formation of a storm or hurricane, etc.). Satellite images can show very large areas, (17) but they can also show a lot of detail when we zoom in. The level of detail depends on the satellite's resolution. In order to interpret these images, it is useful to identify some elements or patterns. For example, it is easy to recognise rivers, seas, plots of land, canals in straight lines, and mountains, which sometimes look like wrinkles on the image. The "false colour" technique is often used in these images so that certain parts stand out. Water is seen in dark blue, vegetation is green or orange and cities usually appear grey. (16) 17. Satellite photo of Nur-Sultan (Kazakhstan) 16. Satellite photograph of the Nile Delta 20
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