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Children's LiteratureFor centuries, travelers relied on ancient maps drawn by cartographers who were uncertain what the area they were drawing actually looked like. Early exploration encouraged countries and explorers to create their own maps that were closely guarded against theft, but were still not entirely accurate. Throughout the eighteenth and nineteenth century, instruments were designed to more accurately determine locations, but little advancement was made in the improvement of maps. The development of radar in the twentieth century allowed people to locate objects without seeing them and the technology was quickly adapted to mapmaking. Even more recently, satellites in orbit above the Earth have begun to continuously map the Earth's surface. Real time pictures are sent back to earth and compiled to show exact images of the earth's surface, including changes in temperature and the relative height and depth of features on Earth. Each page of this title is filled with color illustrations of maps and instruments used to make maps. Activities are provided throughout the text that are designed to help children better understand the information provided. This is part of the "Our Planet Earth" series. 2004, Gareth Stevens Publishing, Ages 7 to 13.