Cities

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ppt used with the 3rd bil

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Cities

  1. 1. Cities
  2. 2. The location of the cities <ul><li>At the seaside </li></ul><ul><li>In the mountains </li></ul><ul><li>In a valley </li></ul><ul><li>Close to rivers </li></ul><ul><li>Close to lakes </li></ul><ul><li>On an island </li></ul><ul><li>At the center of a country </li></ul><ul><li>Etc. </li></ul><ul><li>Why? </li></ul><ul><li>Food supplies (fish, forrest for hunting etc. </li></ul><ul><li>Fresh water supplies (lakes, rivers, valleys) </li></ul><ul><li>Fertile land to grow cereals and vegetables </li></ul><ul><li>Defence </li></ul><ul><li>Communication </li></ul><ul><li>Transport </li></ul>
  3. 3. Examples
  4. 5. City maps <ul><li>A city map is a graphic representation of a city with it´s streets, neighbourhoods, squares, rivers and big buildings. </li></ul>
  5. 6. There are 3 different types of maps <ul><li>Ortogonal map: </li></ul><ul><li>In the form of a grid </li></ul><ul><li>Easy to make maps from </li></ul><ul><li>Easy to divide the city in different parts </li></ul><ul><li>Because every street has a perpendicular angle its easy to construct builings. </li></ul><ul><li>It doesn´t adapt to the differences in height. </li></ul><ul><li>Poor visibility at the different crossings of roads </li></ul>
  6. 7. Radio centrical map <ul><li>It has one central point. The streets and roads are positioned around the center in a circular form. </li></ul><ul><li>Easy communication with the outskirts of the city. </li></ul><ul><li>Easy to adapt to differences in height of the city </li></ul><ul><li>It´s difficult for cars to move through the city. They always have to cross the center. </li></ul>
  7. 8. Irregular map <ul><li>There is no geometrical form </li></ul><ul><li>The streets and roads are positioned without a clear plan. </li></ul><ul><li>You can find alleys without an exit </li></ul><ul><li>Usually found in old historical city centers </li></ul><ul><li>Difficult for trafic to move around </li></ul><ul><li>You will find big open spaces as, squares, gardens, parks etc. </li></ul>
  8. 9. Polders in The Netherlands <ul><li>A polder is a piece of land surrounded by dykes and dried up to be used as farmland, to build new cities or even a whole new province. </li></ul><ul><li>The advantage is that you have a new piece of land that can be used and ordered the most practical. </li></ul><ul><li>The Netherlands has about 3000 polders </li></ul>
  9. 11. Typical Dutch polder
  10. 12. Search examples !

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