http://www.geographyteachingtoday.org.uk/images/uploads/FW_Updating_big4.jpgIsoline maps are a type of thematic map. They use line symbols to show a continuous distribution such as temperature or elevation. Isolines are lines that connect points of equal numeric value. A contour map showing elevation above sea level is a type of isoline map. This is a map of Somerset. The strength of mobile phone reception in the area was looked at and plotted on isoline maps.
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